Foretravel Owners' Forum

Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: gracerace on August 28, 2018, 08:02:37 pm

Title: Cat 3126 Rebuild Odyssey
Post by: gracerace on August 28, 2018, 08:02:37 pm
Hello All
Been a while. This is how I spent my summer, besides racing.
Never imagined in my wildest dreams, I would be this deep into our coach.
Two trips south, and it starts smoking like Cheech and Chong out the blow by pipe. Didn't spit any oil out, just lots of blue smoke, but zero out the tail pipe.
We could have lived with that, but 1 qt of oil every 75 miles was a bit too much.
So down to the nitty gritty. The Caterpillar 3126 2 valve engine was a one year only motor in 1996/1997. They had a tendency to break piston rings. Many were fixed under warranty back when they were new.That is what happened to our motor. At 115K, it broke # 6 oil ring.
It scared the cylinder wall so bad, it was beyond repair. May have been this way for a while, but just got worse. Who knows.
So out comes the block to get sleeved. Sad, because the motor is perfect inside. Looks brand new. No codes, no loss of HP, no loss of boost. Just smoke and oil consumption.
The head also had a minor crack, but wasn't causing any issue. So rebuilt turbo, new rings, bearings one new piston skirt (they are 2 piece) and a good donor head which was rebuilt. We will now be as good as new (or better). Also replacing all the hoses, coolant & belts.
Head is done, block has new sleeve. Waiting on machine shop to finish the boring of the sleeve, and honing all the cylinders with the honing plate in place.Then a hot tank job.
I am a freak when it comes to engine detail, so every part has been cleaned and painted.Engine bay is cleaner since I took the pic shown.
More news and pictures later when she is back together running.
Chris
Title: Re: Cat 3126 Fail
Post by: John44 on August 28, 2018, 08:28:00 pm
Looks good.
Title: Re: Cat 3126 Fail
Post by: bbeane on August 28, 2018, 08:28:50 pm
Cat,  the gift that keeps on giving. It's looking good. 👍
Title: Re: Cat 3126 Fail
Post by: wolfe10 on August 28, 2018, 08:33:53 pm
So, you did have the block (cylinder #6) bored and then an insert/sleeve installed.  So, back to OE spec (vs something like .030 or .040" over)?

Good job.
Title: Re: Cat 3126 Fail
Post by: Mike Leary (RIP) on August 28, 2018, 08:36:15 pm
Good for you! If the coach was a SOB, most of us would tow it to some vacant lot and rent it out. Not with a FT!  b^.^d
Title: Re: Cat 3126 Fail
Post by: gracerace on August 28, 2018, 08:46:38 pm
So, you did have the block (cylinder #6) bored and then an insert/sleeve installed.  So, back to OE spec (vs something like .030 or .040" over)?

Good job.

Yes. I could have had it bored in the coach. It would have taken a 50 thou piston, and that was cutting it close (pun intended). But only 40 thou max piston is available. Couldn't even get one made.
It will be right now.
Chris
Title: Re: Cat 3126 Fail
Post by: gracerace on August 28, 2018, 08:49:36 pm
Good for you! If the coach was a SOB, most of us would tow it to some vacant lot and rent it out. Not with a FT!  b^.^d

Even at that, I considered a nice river property, for it to live out it's life. LOL....So many people said trade it off. But I would never do that to anyone.
Told my wife, "We can't sell it this way, and we can't use it, so we need to fix it"
The people I bought it from, stopped by this summer in their new FT, and it bummed them out. It wasn't their fault. 1st trip south it was fine.
We'll be all in at 3K for everything, and we'll have a fresh engine. Cat wanted 20K. Going to spiff my buddy a few hun for helping. But we have been trading work anyway
Best part is, it's so easy to work on. Lots of bolts and parts, but not really rocket science.
Seeing the motor inside, it's pretty basic, and well thought out. With it's roller lifters etc.

Chris
Title: Re: Cat 3126 Fail
Post by: gracerace on August 28, 2018, 08:58:03 pm
Cat,  the gift that keeps on giving. It's looking good. 👍
Cummings have their issues too. Many have cracked blocks and heads. Not un-common....
Remember, if you have a motor home, you have a problem, you just don't know what it is yet!  >:D
Title: Re: Cat 3126 Fail
Post by: bbeane on August 28, 2018, 09:10:32 pm
Cummings have their issues too. Many have cracked blocks and heads. Not un-common....
Remember, if you have a motor home, you have a problem, you just don't know what it is yet!  >:D
Yep you are correct. It's all fun and games till you get tired of the negative cash flow😬😎
Title: Re: Cat 3126 Fail
Post by: Racedad on August 28, 2018, 10:17:13 pm
Comp cam, a little port work, bigger turbo, methanol injection and give Barbie a run for the money!
Title: Re: Cat 3126 Fail
Post by: gracerace on August 28, 2018, 10:29:26 pm
Comp cam, a little port work, bigger turbo, methanol injection and give Barbie a run for the money!

LOL...Great minds think alike!
And a bigger converter,some deeper gears and a transbrake!
Title: Re: Cat 3126 Fail
Post by: gracerace on August 28, 2018, 10:31:11 pm
Yep you are correct. It's all fun and games till you get tired of the negative cash flow😬😎
Life IS a negative cash flow.... :))
There are NO pockets in caskets.
Title: Re: Cat 3126 Fail
Post by: RvTrvlr on August 28, 2018, 10:49:49 pm
Those baby cats are trouble. I wish they used 3406's in our RVs.
Title: Re: Cat 3126 Fail
Post by: bbeane on August 28, 2018, 11:00:18 pm
3406 might be a bit too heavy.
Title: Re: Cat 3126 Fail
Post by: jcus on August 28, 2018, 11:45:54 pm
About 1000 lbs more than a M-11
Title: Re: Cat 3126 Fail
Post by: bdale on August 29, 2018, 09:39:21 am
Great.  With my coach # being only 2 newer than yours, our engines were probably delivered to FT in the same shipment.  I just passed 100k miles so your story & pics give me something new to worry about for a while.  You had mentioned to me in the past that you had this issue but I didn't realize it took that much tear-down to fix it.  I don't think I could attempt the repairs myself so I hope I never have to make that decision.  Hat's off to you for tackling it.
Title: Re: Cat 3126 Fail
Post by: gracerace on August 29, 2018, 10:11:24 am
Great.  With my coach # being only 2 newer than yours, our engines were probably delivered to FT in the same shipment.  I just passed 100k miles so your story & pics give me something new to worry about for a while.  You had mentioned to me in the past that you had this issue but I didn't realize it took that much tear-down to fix it.  I don't think I could attempt the repairs myself so I hope I never have to make that decision.  Hat's off to you for tackling it.

I wouldn't worry. As many people that don't like the Cat, there are plenty that do. The 3126 engine is a good durable engine if maintained properly.Oil changes are most important because of the Heui pump.
They got a bad rap, and are called "Throw away motor's" because they don't have cylinder liners. If they did, it would have been easier to do the repair.Easier to rebuild for truckers.That doesn't make them throw away, it just means they have to be bored or sleeved out of the coach or truck.
I don't run it hard,service the heck out of it. It pushes the MoHo fine.
Like I said, the engine looked like new inside, it was just a broken ring.Just a bad deal.
Chris
Title: Re: Cat 3126 Fail
Post by: Pierce & Gaylie Stewart on August 29, 2018, 10:46:15 am
The PO might have used ether on a warm engine, easy way to break a ring. After changing fuel filters, many are tempted if it does not start right away. Ring land wear is greater on engines with few oil changes and can allow the rings to flex beyond the breaking point with ether.

Pierce
Title: Re: Cat 3126 Fail
Post by: Old phart phred on August 29, 2018, 10:51:42 am
Did you have to remove the rear cap? I think mine will come out the bottom if I dig a hole.
Title: Re: Cat 3126 Fail
Post by: Pierce & Gaylie Stewart on August 29, 2018, 11:19:56 am
Did you have to remove the rear cap? I think mine will come out the bottom if I dig a hole.
I'm about to experiment with our U300 and make a cut on both sides next to the engine door and right underneath (where you can't see it) the aluminum strip that goes around the corner. I will lay some glass over a 1/8" flat bar that will also go from the engine door and then around the corner. The bumper (everything below the engine door can then be removed and then everything taken out of the way so the engine can be worked on or removed. Screws under the trim will partially keep it in place and the existing screws on each side also making it very secure. Pretty easy modification.

Pierce
Title: Re: Cat 3126 Fail
Post by: Chuck & Jeannie on August 29, 2018, 11:28:00 am
You will, of course, post photos!
Title: Re: Cat 3126 Fail
Post by: gracerace on August 29, 2018, 09:54:41 pm
Did you have to remove the rear cap? I think mine will come out the bottom if I dig a hole.

Came right out the back, plenty of room with the head off, made a custom cradle. Took the oil pan and oil pump off 1st. Going to completely assemble the engine, turbo and all, just no pan or pump. Installing with a fork lift. We measured it, plenty of room.
I converted a place on the back of my car hoist with a platform, to assemble it.
Crank in, roll on side, piston's/rods in, stand straight up complete assembly. Then put the bell housing on, hanging off the end of lift
The crank is flush with the bottom of the block
Chris
Title: Re: Cat 3126 Fail
Post by: gracerace on August 29, 2018, 10:00:55 pm
The PO might have used ether on a warm engine, easy way to break a ring. After changing fuel filters, many are tempted if it does not start right away. Ring land wear is greater on engines with few oil changes and can allow the rings to flex beyond the breaking point with ether.

Pierce

You never know, but it has a great fuel primer, so that is never a problem. It has been a southern coach, Texas and California all it's life. Always starts easy in sub zero here
PO owner has 50 tractors, he is pretty smart about diesels on his farm.
Chris
Title: Re: Cat 3126 Fail
Post by: Old phart phred on August 29, 2018, 11:35:03 pm
My 3208 cat was only a little grumpy, when i had to fire it up in an emergency, block heater not plugged in, no ether, 15 outside. It's going to be in a 40+ heated insulated coach house from now on.
Title: Re: Cat 3126 Fail
Post by: gracerace on August 30, 2018, 02:10:14 pm
My 3208 cat was only a little grumpy, when i had to fire it up in an emergency, block heater not plugged in, no ether, 15 outside. It's going to be in a 40+ heated insulated coach house from now on.

The 1st winter after our purchase, we sold our old coach. Part of the deal was they got to store it inside our heated shop.We leave at Christmas anyway.
I find if I use the block heater, it actually starts harder. The block heater warms the engine enough the "wait to start" feature turns off (plenum heater). So then it's a bugger to get running.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 06, 2018, 08:50:16 pm
Update
Block and head are back. Cost me $600.00 for one sleeve, deck job, hone all cylinders and hot tank. Cam bearing are pristine.Crank and main bearing's like new
Head was $1200.00, price included $500.00 for a good core. All new intake valves, seats and springs. I highly recommend PMS machine machine in Spokane. Quality work, fast, price was super, and all the people there are friendly.
Total, $1800.00 and change.

Power Machine Service, Spokane Washington (http://www.powermachineservice.com/)

Crank is already in, rods and pistons next after I paint the block.
Plan to enter it in the Oakland roaster show when done!
Chris

Picture is my good buddy Jay helping...
Title: Re: Cat 3126 Fail
Post by: Hans&Marjet on September 06, 2018, 08:56:06 pm
Nice work...!!! is the crank still Std..?

Title: Re: Cat 3126 Fail
Post by: bbeane on September 06, 2018, 08:59:58 pm
Good job, all that's left is a little assembly! 😎🌵👍
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 06, 2018, 10:04:27 pm
Great work, do right and you do it once. That block looks so tiny vs the 10.6l 3208, but then again I have not seen a naked 3208 block. Cat numbers make no sense to me, how many liters is that motor?
Title: Re: Cat 3126 Fail
Post by: wolfe10 on September 06, 2018, 10:15:34 pm
3126 is 7.2 liters. HP to 330. Torque 860 lb-ft @ 1,440.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 06, 2018, 11:29:25 pm
Nice work...!!! is the crank still Std..?
Didn't touch the crank or mains. Factory Standard
Title: Re: Cat 3126 Fail
Post by: gracerace on September 06, 2018, 11:31:15 pm
Great work, do right and you do it once. That block looks so tiny vs the 10.6l 3208, but then again I have not seen a naked 3208 block. Cat numbers make no sense to me, how many liters is that motor?
Funny, it does look small like a chevy 6 cylinder, but it isn't. And it is heavy too.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 06, 2018, 11:34:30 pm
Good job, all that's left is a little assembly! 😎🌵👍

Hope we can remember where every bolt goes. Got a million of them Bruce.
I put them in groups, and labeled the can's. But there is still a ton of them in each can.
At least everything is clean and nice to work with.
Once it's in, a million hoses.
Still better then paying Cat 20K+

Chris
Title: Re: Cat 3126 Fail
Post by: gracerace on September 06, 2018, 11:36:29 pm
Working the numbers, with everything, hose's , oil and all, going to be right under $3500.00
 :))
Title: Re: Cat 3126 Fail
Post by: Caflashbob on September 06, 2018, 11:46:27 pm
Old cat mechanics mentioned the cat yellow paint held the oil links in.  Paint assembled?
Title: Re: Cat 3126 Fail
Post by: John44 on September 07, 2018, 12:19:17 am
The Cat paint is Krylon cat yellow.The best gasket cement is the Cat green.
Title: Re: Cat 3126 Fail
Post by: craneman on September 07, 2018, 12:21:36 am
The Cat paint is Krylon cat yellow.The best gasket cement is the Cat green.

And the best metal to metal sealer is Cat red.
Title: Re: Cat 3126 Fail
Post by: TulsaTrent on September 07, 2018, 03:05:45 am
At least everything is clean and nice to work with.
What did you use to clean up the bolts?
 
Thanks,
 
Trent
Title: Re: Cat 3126 Fail
Post by: Mike Leary (RIP) on September 07, 2018, 09:08:51 am
Sweet! Is that your shop, Chris? I sure miss mine!  ^.^d
Title: Re: Cat 3126 Fail
Post by: gracerace on September 07, 2018, 10:59:55 am
Old cat mechanics mentioned the cat yellow paint held the oil links in.  Paint assembled?
Bob
I have heard that too. Probably because a couple of parts have no gasket, just sealer, and the rest is O rings......Everything is painted, put going to paint complete motor when done again.
Chris
Title: Re: Cat 3126 Fail
Post by: gracerace on September 07, 2018, 11:01:05 am
What did you use to clean up the bolts?
 
Thanks,
 
Trent
My parts cleaner tank (paint thinner), then wire wheel
Title: Re: Cat 3126 Fail
Post by: gracerace on September 07, 2018, 11:02:01 am
Sweet! Is that your shop, Chris? I sure miss mine!  ^.^d
yes
Title: Re: Cat 3126 Fail
Post by: gracerace on September 07, 2018, 11:02:57 am
And the best metal to metal sealer is Cat red.
Probably. But "Right Stuff" is killer. using that
Title: Re: Cat 3126 Fail
Post by: gracerace on September 11, 2018, 08:34:42 pm
Piston, rods and head today. Head torque has to be at least 300 LBS. Took some big wrenches.Motor is pretty much assembled. Spins over nice.
Look at the pictures close. You can see the 3rd unused lobe on the cam, probably for the next generation 3126 A three valve engine.
Should be installing it tomorrow into the coach completely assembled.
Check out the pretty ladies all in a row! Not jay, he is my racer friend helping!
Chris
Title: Re: Cat 3126 Fail
Post by: Pierce & Gaylie Stewart on September 11, 2018, 08:50:14 pm
Nice, sanitary work. Sure it will run well. Some shops throw a lot of used parts back into a overhaul. Yours is more like a re manufactured engine.

Pierce

Title: Re: Cat 3126 Fail
Post by: gracerace on September 11, 2018, 09:08:44 pm
Nice, sanitary work. Sure it will run well. Some shops throw a lot of used parts back into a overhaul. Yours is more like a re manufactured engine.

Pierce

Thank you, best part is, we are ck, ck, and triple checking every thing. Most shops blow it on something. I am always disappointed.
being a drag racer, I can't see losing a race Mickey Mousing's something. I hate working on my car at the track.
I bet it starts up, and runs perfect from day one. As I mentioned before, engine looked perfect inside. Just a stupid $10.00 oil ring fail.

Chris
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 11, 2018, 09:18:54 pm
Lot a great satisfaction when you turn the key and it roars to life, checking and rechecking keeps the pair of noids away.
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 11, 2018, 09:37:21 pm
Extra cam lobes may be for vibration control on an inline motor, what's the latest and greatest assembly lube?
Title: Re: Cat 3126 Fail
Post by: gracerace on September 11, 2018, 10:24:44 pm
Extra cam lobes may be for vibration control on an inline motor, what's the latest and greatest assembly lube?
Using Lucas assembly lube. Like it. 10/30 oil for cylinders
Title: Re: Cat 3126 Fail
Post by: gracerace on September 12, 2018, 08:35:41 pm
Ever so close. Maybe one more day. Picked it up with the cherry picker to turn it around. No issue's.
Title: Re: Cat 3126 Fail
Post by: kenhat on September 12, 2018, 10:45:59 pm
Ever so close. Maybe one more day. Picked it up with the cherry picker to turn it around. No issue's.
Looks great Chris. Nice job!

see ya
ken
Title: Re: Cat 3126 Fail
Post by: gracerace on September 13, 2018, 12:07:44 pm
You won't believe this one, it's scary. See those 6 silver bolts. Those are smaller head bolts (40 lbs torque), that were never installed from day one. Had to go buy them. We noticed it while we were assembling the engine.

All the bolts were in groups cleaned. Never left the shop, checked my parts cleaner thoroughly. Neither of us remember them taking it apart.My shop is clean and organized, no way they were miss placed, especially considering the size and length of them.

While they do bolt the head down, they are not around the cylinder area, but they do hold the side of the head down.
May be why the head cracked, will never know! The Brazilian guy ( head say's made in Brazil on it) must have went on his coffee break while assembling the engine.

Bizarre.
Title: Re: Cat 3126 Fail
Post by: John44 on September 13, 2018, 12:21:10 pm
Have worked on hundreds of 3306,3304 never saw that before,looks like they don't have washers.
Title: Re: Cat 3126 Fail
Post by: Mike Leary (RIP) on September 13, 2018, 12:58:15 pm
Did you have to special order them? What a screw-up!  :headwall:
Title: Re: Cat 3126 Fail
Post by: RvTrvlr on September 13, 2018, 01:18:15 pm
Those extra lobes are for non-HEUI engines. They use mechanical unit injectors driven off that extra lobe. The injectors are still ECU controlled but use a cam driven plunger rather than oil pressure to operate.

The extra cylinder head bolts are a cat thing. My thought is they just help keep the gasket held in place on the unsupported side of the head where the pushrods come up. All the big 3500 series engines have that and many don't get reinstalled. Rarely does it even cause an oil leak. I stopped working on cat engines before I went to cat school to actually learn what their purpose is.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 13, 2018, 01:48:38 pm
Those extra lobes are for non-HEUI engines. They use mechanical unit injectors driven off that extra lobe. The injectors are still ECU controlled but use a cam driven plunger rather than oil pressure to operate.

The extra cylinder head bolts are a cat thing. My thought is they just help keep the gasket held in place on the unsupported side of the head where the pushrods come up. All the big 3500 series engines have that and many don't get reinstalled. Rarely does it even cause an oil leak. I stopped working on cat engines before I went to cat school to actually learn what their purpose is.

Good info, thanks. No one could answer us. The head came from another engine. We called to see if my other head had bolt imprints or even holes, but they threw it away already.

This head had bolt imprints in it. Cat had the bolts, but would have been a few days. Went to the hardware store, and bought new one's. Only could get 8.8, but they only torque to 40 PSI, wasn't worried about it.

Washer are not shown in Cats engine parts diagram. Only for the big ones. The head imprint confirmed it.

Cheers
Title: Re: Cat 3126 Fail
Post by: gracerace on September 13, 2018, 01:53:33 pm
Did you have to special order them? What a screw-up!  :headwall:

Western States Cat has everything, if not it's at one of their local 3 stores. They had one bolt in Hayden in one direction, 5 in Spokane in the opposite direction. All 6 in kalispel Montana.

They are really good on parts, I mean every little o ring and bolt. But everything is sold with no return. I even have an account.

They would have cost me over $40.00 with Washington tax, plus all the driving. I paid $15.00 at Ace 2 miles away

Chris
Title: Re: Cat 3126 Fail
Post by: John44 on September 13, 2018, 02:03:35 pm
All the Cats I worked on were the nat. gas models,used most of the diesel parts so for the gas everything was overkill,think the
head bolts were only 165.The nat. gas made working on the engine a lot cleaner.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 13, 2018, 02:16:15 pm
All the Cats I worked on were the nat. gas models,used most of the diesel parts so for the gas everything was overkill,think the
head bolts were only 165.The nat. gas made working on the engine a lot cleaner.

It's fun now, everything is clean. Can wear my good cloths to work on it. Not so much pulling it out. ;D
Title: Re: Cat 3126 Fail
Post by: gracerace on September 13, 2018, 08:19:34 pm
Ready to go in. Lots easier working on it on an adjustable bench, then in the coach. But that's not all that bad either. If it was anything but a Foretravel, I wouldn't have attempted it.
1st engine I ever worked on, that I didn't end up with bolts left over. Actually had to go buy an exhaust bolt, sure it will turn up.
Glad I took lots of pictures before I pulled it, a few brackets were confusing.
Lets rock this thing
CW
Title: Re: Cat 3126 Fail
Post by: Pierce & Gaylie Stewart on September 13, 2018, 09:02:24 pm
Those extra lobes are for non-HEUI engines. They use mechanical unit injectors driven off that extra lobe. The injectors are still ECU controlled but use a cam driven plunger rather than oil pressure to operate.
All Detroit 2 cycles have the "extra lobe" to operate the unit injectors for each cylinder. The earlier mechanical Detroits had a mechanical linkage a.k.a "rack" to operate the injectors while all the Detroits 2 cycles that Foretravel fitted are electronic so a the ECU operates them. In other words, no rack to run that was labor intensive and required experienced mechanics to do it.

The Detroits have two camshafts, one for each bank and being a two cycle, operate at crankshaft speed not half speed like the CAT does.

Little tidbits. :)

Chris is doing this at record speed. Great photos and posts!

Pierce
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 13, 2018, 09:21:43 pm
Nothing sexy'r than yellow and black. Great job on masking those valve cover decals. I'm guessing fuel bleed time is going to be tough and messy.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 13, 2018, 09:49:08 pm
Nothing sexy'r than yellow and black. Great job on masking those valve cover decals.
I'm guessing fuel bleed time is going to be tough and messy.


Thanks. If I was a rich guy, would have chromed the gear cover...LOL

It has an excellent hand prime pump, that works great. I also have a manual hand Vac pump I can suck it out of the rail with.
Have several idea's for the oil. It has always been an easy starter, everything is pre-lubed.
The lower end will have oil pressure before it start's, because the HUEI pump has to create much higher pressure before the computer will let it start, do to the actuator control Value
CW
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 13, 2018, 10:01:51 pm
Yep warm oil may allow it to spin faster, my cat spins to life in less than 1 Mississippi one. Amazing for a diesel.
Title: Re: Cat 3126 Fail
Post by: wolfe10 on September 14, 2018, 10:15:36 am
Did you install new O rings on the injector connections as Dave Atherton has mentioned?  Oil intrusion into those connections can cause a mis-fire.  Fix under $3.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 14, 2018, 11:08:28 am
Did you install new O rings on the injector connections as Dave Atherton has mentioned?  Oil intrusion into those connections can cause a mis-fire.  Fix under $3.

All the injectors had new Cat O rings installed 500 miles ago, when trying to resolve oil usage issue. They still look new.

All the fuel and oil line's received new Cat O rings.

I replaced 4 of the harness plugs that were broken with Cat Part # 3669748:

366-9748: Wiring Kit | Cat® Parts Store (https://parts.cat.com/en/catcorp/366-9748)

I like the replacement plugs because they have metal clips. But the old ones were fine. They only get broken when you remove them.

The rest of the plug seals were fine, cleaned and sprayed contact cleaner in them.

I have one extra plug on board in my parts bin

Thanks for looking out for us

Chris
Title: Re: Cat 3126 Fail
Post by: Green99 on September 15, 2018, 07:45:39 pm
Chris,
The engine really looks good.  I'm not sure any amount of money would get you the job you have done.
Title: Re: Cat 3126 Fail
Post by: gracerace on September 15, 2018, 09:54:03 pm
Chris,
The engine really looks good.  I'm not sure any amount of money would get you the job you have done.
Thank you, labor of love.
Chris
Title: Re: Cat 3126 Fail
Post by: gracerace on September 17, 2018, 08:55:48 pm
It's in. Cherry picker worked great. Saved the hassle of renting a fork lift
Trans bolted up, torque converter bolts in. Just start hooking stuff up. Got busy, racing this weekend. probably Be next week.
Chris
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 17, 2018, 08:59:31 pm
 ^.^d  ^.^d
Title: Re: Cat 3126 Fail
Post by: gracerace on September 19, 2018, 09:50:58 pm
Fired right up. No more smoke....Just need to put the P/S pulley on, and a couple of other things.


https://www.facebook.com/racerforchrist/videos/10212614608706459/
Title: Re: Cat 3126 Fail
Post by: Old phart phred on September 19, 2018, 10:29:48 pm
I'm guessing your one proud papa, for bringing this baby back to life. Hope your grin doesn't break your face. Rock on!!! You the MAN ^.^d  ^.^d
Title: Re: Cat 3126 Fail
Post by: gracerace on March 18, 2020, 07:24:49 pm
Just for giggles, update:

7K miles so far, 3,400 Yuma winter trip. Zero oil leaks

Looks fresh as a babies butt!

Used 1qt oil.

It appears it doesn't use any oil till it reaches 2K miles, then at 3,500 or so, it uses 1 qt. Both oil changes it has done this.

Averaged (not got, averaged) 8.5 MPG. Sweet spot is 1780 RPM's (62 mph) Ran it 65 mph , could see a 1 mpg drop.

Most the time the silverleaf was showing 10-11 MPG,

Cheers
Title: Re: Cat 3126 Fail
Post by: Caflashbob on March 18, 2020, 08:08:04 pm
You are less than a buck a mile now after the rebuild.  Slowly driving the money out of the coach
Title: Re: Cat 3126 Fail
Post by: gracerace on March 18, 2020, 08:22:46 pm
You are less than a buck a mile now after the rebuild.  Slowly driving the money out of the coach

It owes me nothing now Bob, it has given me both grief and joy. But the experience gained was worth it. The joy now, is over the moon. There is no other coach I would want.

Thought I didn't like Cats, but there are a lot of things I do like. Like industrial strength block. Put it along side a 8.3, and it's like 4.0 jeep engine sitting next to the Cat! (no offense to you 8.3 guys, it is a good engine too)

The Foretravel coach with a Cummings came with a 100K warranty, with a Cat 200K. That tells you something.

I believe all the grief was, because someone got it hot, and for sure lack of maintenance (not on my part)

Total miles traveled since owned 25K, and it's never left us stranded!

Cheers
Chris
Title: Re: Cat 3126 Fail
Post by: Dub on March 18, 2020, 10:46:28 pm
Appears the silver leaf may not reflect actual mpg.. I've had owner operators leased to me sure they were getting 7.9 mpg by the truck display.. I bought the truck from the owner operator and figured mileage old school way / gallons into miles and driving conservatively I saw 6.5 and as low as 6.. I'm not familiar with Silverleaf so won't speculate but I do know the economy readouts on class 8 trucks is not a true reading of a units mpg.. This engine was a ISX Cummins 500 hp. That experience made me doubt the trucks calculating .. Only reason I bought several of those KW's set up that way was bogus mpg claims.. Bought 3 of them in 2 weeks and they are at point of selling.. Will replace with Detroit series 60. Still won't have high mpg in fuel but parts for the engine are a fraction of the ISX.
Title: Re: Cat 3126 Fail
Post by: Dub on March 18, 2020, 11:01:34 pm
Followed your work 2 years back and am glad it worked out for you. A truck shop won't take the care and attention to detail you and your friend did.
Title: Re: Cat 3126 Fail
Post by: Caflashbob on March 19, 2020, 01:17:33 am
I think there are changeable multipliers in the various fields in the VPMS screen. 

I think Roger here knows if the actual mpg can be what the screen shows?

My particular setup seems very accurate. 

Good enough to be able to factor in the diesel side of the aquahot and/or the gen at .44 gph using the gens hour meter.

I do lean the coach to fill the tank to the top
Title: Re: Cat 3126 Fail
Post by: gracerace on March 19, 2020, 10:06:28 am
Appears the silver leaf may not reflect actual mpg.. I've had owner operators leased to me sure they were getting 7.9 mpg by the truck display.. I bought the truck from the owner operator and figured mileage old school way / gallons into miles and driving conservatively I saw 6.5 and as low as 6.. I'm not familiar with Silverleaf so won't speculate but I do know the economy readouts on class 8 trucks is not a true reading of a units mpg.. This engine was a ISX Cummins 500 hp. That experience made me doubt the trucks calculating .. Only reason I bought several of those KW's set up that way was bogus mpg claims.. Bought 3 of them in 2 weeks and they are at point of selling.. Will replace with Detroit series 60. Still won't have high mpg in fuel but parts for the engine are a fraction of the ISX.

Thanks for the compliments

Did it the old fashion way.

Left with full tank, returned with full tank.It was total gallons used divided by total miles driven. so it was actually 8.5+ MPG for whole trip average.

The silverleaf showed 8.3 average for the trip.

It reads 3- 4 MPG on mountain roads, so that is what kills the mileage over all when you start averaging.

We have gotten even better, like 9.5-10 mpg when driving to Leavenworth Wa., which is flat, no hills, no toad,and driving in the sweet spot of 1775 rpm's.

BTW, The mileage included 4 hours of gen running...10K Kabota 4cyl. We were also towing a Jeep Wrangler, and was fully loaded down, more returning home with all those goodies we bought in Mexico and Yuma. You know TP and paper towels!

All of this is better, considering last trip with the sour engine, it got 6 MPG, and 1 qt oil every 90 miles!

Cheers
Chris
Title: Re: Cat 3126 Fail
Post by: Pierce & Gaylie Stewart on March 19, 2020, 11:17:42 am
Will replace with Detroit series 60. Still won't have high mpg in fuel but parts for the engine are a fraction of the ISX.
Don't you mean DD13 or DD16? Coupled to a DT12 auto/manual, you should get better mileage and without smog maintenance the others have.

Pierce
Title: Re: Cat 3126 Fail
Post by: gracerace on March 19, 2020, 04:18:43 pm
Don't you mean DD13 or DD16? Coupled to a DT12 auto/manual, you should get better mileage and without smog maintenance the others have.

Pierce

I seriously considered changing engines, when going through all that back then. But it isn't easy, very complex. Torque converter, cooling, dash cluster, cruise control, it goes on and on.

Even the next year 3126 B wasn't easy, trust me, I spent 2 months on the subject every day.

Not saying it can't be done, With the right amount of money, and patience, anything for the most part can be done.
But it's not like pulling a SB chevy out, and putting a BB in!
Chris
Title: Re: Cat 3126 Fail
Post by: juicesqueezer on March 19, 2020, 04:43:35 pm
With our silver leaf from Roger, we are averaging right at 8 mpg overall.  Happy with that and keep rpm's under 1500 as well with a speed in the 64 mph range.  Like you mentioned Chris, the hills and mountains are a killer for sure!  Being full time, we are not in any hurry for sure!
Title: Re: Cat 3126 Fail
Post by: gracerace on March 19, 2020, 05:20:53 pm
With our silver leaf from Roger, we are averaging right at 8 mpg overall.  Happy with that and keep rpm's under 1500 as well with a speed in the 64 mph range.  Like you mentioned Chris, the hills and mountains are a killer for sure!  Being full time, we are not in any hurry for sure!

Good news Joe. I treat ours like a fine sewing machine, or a back hoe running at steady, even, low RPM's. 8)

CW
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Dub on March 19, 2020, 05:56:57 pm
Trading trucks not just engines. The 3 ISX have made it to a million miles so can't complain about the engine life they just never got the mpg advertised and cost to inframe is double that of a Detroit..That's good fuel mileage Chris, that fresh Cat looks like will make you a good one.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: John and Stacey on March 19, 2020, 06:07:36 pm
Chris,
        Great job of fixing the old CAT.  I have 149,000mi on my 1997 and it does not use any oil and gets the same milage as you do.  You had me concerned after re-build on first trip when you stated milage.  Then I saw it was without toad on level road.  I seem to always be heading west into a strong headwind or climbing over 10,000 feet in Colorado. Congratulations on a job well done.
John
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 19, 2020, 06:10:37 pm
Chris,
        Great job of fixing the old CAT.  I have 149,000mi on my 1997 and it does not use any oil and gets the same milage as you do.  You had me concerned after re-build on first trip when you stated milage.  Then I saw it was without toad on level road.  I seem to always be heading west into a strong headwind or climbing over 10,000 feet in Colorado. Congratulations on a job well done.
John

Brothers from different mothers!...Coach numbers are close.
I probably worked on your coach at some time, if it ever hit the left (west) coast
Looks like the bad injector did it trick permanently for you....Thanks for your past help John
CW
CW
Title: Re: Cat 3126 Rebuild Odyssey
Post by: John and Stacey on March 19, 2020, 06:21:09 pm
Coach was originally a Kansas coach and Jcus had her for a short time, I have had her for 6 years now.

Injector fixed the problem and keeping the oil at the bottom of the full range on the dipstick eliminated all blow-by.
John
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Dub on March 19, 2020, 06:34:19 pm
P.... Have had 60's that I'm not sure of displacement. Have had 6 or 8 Rated from 430 to 515 hp.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Dub on March 19, 2020, 06:53:20 pm
Nothing like having a fresh engine like Chris has now with zero questions about the guts.. Nothing like going down the road with complete confidence in the engine.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 19, 2020, 07:08:52 pm
Nothing like having a fresh engine like Chris has now with zero questions about the guts.. Nothing like going down the road with complete confidence in the engine.

Ah, the smell of a fresh engine (probably just the paint)

And yes, still amazes me, all those parts spread all over the shop and bench, and they are all going up and down, and around perfectly.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 19, 2020, 07:19:08 pm
Coach was originally a Kansas coach and Jcus had her for a short time, I have had her for 6 years now.

Injector fixed the problem and keeping the oil at the bottom of the full range on the dipstick eliminated all blow-by.
John

Good point. I calibrated the stick, when I did the engine. It is at the lower mark now, which is about 2 qts low. I may just run it there a while through the summer, before I add, and just see what it does,

As I mentioned, it seems to stay at the full mark, till about 2K miles, then use just a little.About the time the oil starts to darken, Zero leaks, zero blow by.

1st oil was 15/30 (recommended by Cat because of the HUIE pump), second oil change is 15/30 -15/40 mix (same brands). Going all 15/40 next time. Changing at 4K miles. Oil is cheap.

Running Mobile Delvac. It's re- labeled for Cat , as Cat oil, researched it. Going to stick with it. Good enough for Cat, good enough for me. ^.^d
Title: Re: Cat 3126 Rebuild Odyssey
Post by: pthurman48 on March 20, 2020, 09:42:08 am
Hi Chris and all,
  I have a '94 Cat 3116 in a '95 U-240. No one thought they could get the engine out of the coach.  I found a guy in Pasadena, Tx that bored my block here in Lufkin,Tx while engine still in the coach.  He bored the block, pressed(hammered) in sleeves, then bored the sleeve back to Cat standard size.  My shop then installed all the new standard pistons, rings, rod and main bearings, new oil pump, my old head(rebuilt locally).  I now have 40K miles on the 250hp 3116 kittyCat and it is running strong with oil consumption at about 2 qts per 1500 miles.  I am happy.  I am also amazed that the oil pump puts out 61 psi at anything over 1500 rpm @ 190 degs.

Pat
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 20, 2020, 11:37:05 am
Hey
I actually tried to bore the bad cylinder in the coach. A friend had a boring bar, but could not get a piston big enough to fit the size we would have had to bore it to.

I called all over the NW, Portland, Seattle etc. No one does in chassis boring or crank turning.One would be lucky to get anyone to fix the engine like you and I did. Lost trade. Now they just replace them. Probably because of all the warranty issues they have.

It was easy to get the engine in and out with just a standard cherry picker.

I like that 61 PSI oil pressure, ours is 40 PSI @ 185, which is what the motor was dyno'd at new. I have all the sheets on our exact motor. A old Cat diesel mechanic had access to them.So it's OK.

Chris
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Pierce & Gaylie Stewart on March 20, 2020, 12:44:56 pm
Some models are easier to get the engine out. The last of the GVs have a big engine door that makes everything less of a hassle.

I looked at ours to see how hard it would be. If you remove the aluminum strips above the bumper and then make a careful cut under where they were, then you could glass in a steel 1/8" strip to attach the bumper and the wrap around sides. You could then cut and then flange the cross member with some grade 8 fasteners to keep it securely in place. Removing the engine would then be easy with a floor jack/brace arrangement with four heavy duty wheels. The bumper would go back in place, screws installed and then the aluminum trim strip replaced so you would never notice the joint.

A Euro bus driver showed me his big air cooled flat diesel. He said the shop had a dolly on wheels so they just raised the coach with air, rolled the dolly under, lowered the coach to attach it, raised the coach again with air and rolled the engine out. It was all modular and the fan was not attached but above the engine so the R&R could be done in under 20 minutes. I remember as a kid, two of us replaced a VW clutch and had it running again in 17 minutes. Four engine bolts, fuel line, heater controls/ducts, the funny little accelerator clip/wire cable at the carb plus generator wires.

Pierce
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 20, 2020, 01:01:29 pm
Some models are easier to get the engine out. The last of the GVs have a big engine door that makes everything less of a hassle.

I looked at ours to see how hard it would be. If you remove the aluminum strips above the bumper and then make a careful cut under where they were, then you could glass in a steel 1/8" strip to attach the bumper and the wrap around sides. You could then cut and then flange the cross member with some grade 8 fasteners to keep it securely in place. Removing the engine would then be easy with a floor jack/brace arrangement with four heavy duty wheels. The bumper would go back in place, screws installed and then the aluminum trim strip replaced so you would never notice the joint.

A Euro bus driver showed me his big air cooled flat diesel. He said the shop had a dolly on wheels so they just raised the coach with air, rolled the dolly under, lowered the coach to attach it, raised the coach again with air and rolled the engine out. It was all modular and the fan was not attached but above the engine so the R&R could be done in under 20 minutes. I remember as a kid, two of us replaced a VW clutch and had it running again in 17 minutes. Four engine bolts, fuel line, heater controls/ducts, the funny little accelerator clip/wire cable at the carb plus generator wires.

Pierce

I had this rear engine Ford  Econoline I built in the late 70"s Very road worthy, was in 20 car mags including Hot Rod twice.
Had a 400 Chrysler via custom V drive. (the Hot Rod write up was wrong. Wasn't a Chevy).
Could pull the engine trans in 20 minutes.
Went through 3 different stages in it's life.
Drove it thousands of miles with no issue's to Van runs. Was still being driven last I saw it. Traded it for a Chevelle.
Chris
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Pierce & Gaylie Stewart on March 20, 2020, 01:18:32 pm
Good photos! So good to take photos in the crazy years. I just found some old photos and even a super 8 movie that I will have digitized.

Car makers should turn over their prototypes to hot rodders before production. Sure would have cars that would be easier to work on and probably safer too.

Pierce
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 20, 2020, 01:34:06 pm
Good photos! So good to take photos in the crazy years. I just found some old photos and even a super 8 movie that I will have digitized.

Car makers should turn over their prototypes to hot rodders before production. Sure would have cars that would be easier to work on and probably safer too.

Pierce

Costco does a great job. Expensive.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Hans&Marjet on March 21, 2020, 04:16:11 pm
I had this rear engine Ford  Econoline I built in the late 70"s Very road worthy, was in 20 car mags including Hot Rod twice.
Had a 400 Chrysler via custom V drive. (the Hot Rod write up was wrong. Wasn't a Chevy).
Could pull the engine trans in 20 minutes.
Went through 3 different stages in it's life.
Drove it thousands of miles with no issue's to Van runs. Was still being driven last I saw it. Traded it for a Chevelle.
Chris

I remember seeing that van in HRM ! way kool
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Hans&Marjet on March 21, 2020, 09:53:45 pm
I remember seeing that van in HRM ! way kool

Fremont !!! Loved it ....70 Kawi 500 Triple....13.2 .....Wow what a ride..
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 22, 2020, 10:20:37 am
Fremont !!! Loved it ....70 Kawi 500 Triple....13.2 .....Wow what a ride..

Drove the van there once from Santa Rosa. It was a Mopar race. Didn't race it,
Was a great track. Ran my Cuda there once.
Hang Over Nations of New Years day....Wow!
Title: Re: Cat 3126 Rebuild Odyssey
Post by: craneman on March 22, 2020, 10:38:45 am
Freemont is still there, just renamed Famosa. NHRA owns it now and holds the Summit series there. Also the March meet still lives.

Edit
My bad not the track I raced at.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Pierce & Gaylie Stewart on March 22, 2020, 12:07:23 pm
Just watched (online) a new Porsche Turbo with a few engine changes go 8.77 seconds and 155 mph in the quarter. Looked stock. The wheelie cost time but was still 9.27. Good photos/video at: Watch Porsche 911 Turbo S Pop Two-Foot Wheelie on Video - Motor Trend (https://www.motortrend.com/news/porsche-911-turbo-s-wheelie-video-info-pictures/)
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 22, 2020, 03:38:36 pm
Freemont is still there, just renamed Famosa. NHRA owns it now and holds the Summit series there. Also the March meet still lives.

No sir. Fremont (later named Baylands) was in Fremont California. The "Grove" , "Smokersfield"  (Bakersfield ) was never called Fremont....My friend Jim Black is in charge of track prep at Formosa.

Many car movies were filmed at Fremont.

The Summit Series is held at all NHRA tracks in their division. The E.T finals are held at different tracks in each division, rotated yearly.

I have raced The E.T. finals 3 times. Once in Ascroft Canada (now de-funk)in my Purple Duster, Woodburn Oregon, in my Daytona and Pacific raceways in my Valiant..

Fremont Dragstrip - Wikipedia (https://en.wikipedia.org/wiki/Fremont_Dragstrip)

CW

Title: Re: Cat 3126 Rebuild Odyssey
Post by: John44 on March 22, 2020, 04:06:31 pm
What happened to the rebuild part?????????
Title: Re: Cat 3126 Rebuild Odyssey
Post by: craneman on March 22, 2020, 04:38:23 pm
Couldn't resist one more.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 22, 2020, 07:09:19 pm

Looks like the whole west coast was division 6 once. I see no mention of Utah or Arizona teams, which are division 7 now.

Northwest is division 6 now, south is division 7. Which includes Hawaii

My number is 6348. Six is for division 6

Great clipping

CW
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 22, 2020, 07:20:19 pm
What happened to the rebuild part?????????

Odessa is a big word....LOL
 
If the administrators want to change this last part, that is fine. But what does it matter, it's just people (friends) communicating, as long as it doesn't get nasty.

My friends and I go on jack rabbit trails all the time when we communicate/talk. Sometimes while talking, I say 'Changing subjects" just so they know we are going to another different topic.

So changing topics,Here:

The coach leaves no oil spots, engine or trans. Still amazes me.

Someone told me once (maybe Bob) it's that yellow paint that seals them Cats up. Well I agree. I painted every part hard after complete cleaning of each one, then painted it all again once together. I bet I used 8 rattle cans.

Cheers
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Caflashbob on March 22, 2020, 07:40:33 pm
Yes kitties like the yellow paint.  Smart boy to recoat it assembled.  Just as cat did.  They probably did 2 coats.  Not the parts before.  You could see how thick it was new
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 22, 2020, 07:41:27 pm
Yes kitties like the yellow paint.  Smart boy to recoat it assembled.  Just as cat did.  They probably did 2 coats.  Not the parts before

See, I listen to you old guy..... 8)
Title: Re: Cat 3126 Rebuild Odyssey
Post by: Caflashbob on March 22, 2020, 07:50:21 pm
Thank you.  Happy to gather together around the electronic camp fire.  We all learn together. I was one of the few in the rv biz that asked ALL the questions.

I switched to dirt bikes in 1968.  Versus green hot dogs and hurry up and wait to race at Lions, Irwindale and then  OCIR when it opened.

 
Title: Re: Cat 3126 Rebuild Odyssey
Post by: DavidS on March 22, 2020, 08:08:40 pm

My friends and I go on jack rabbit trails all the time when we communicate/talk. Sometimes while talking, I say 'Changing subjects" just so they know we are going to another different topic.
So changing topics,Here:
Cheers

its called communication.. ..Maybe its ADHD or LMNOP or ABC? Never really have one subject convos in person.. usually leads to some other topic going at the same time.. lol.. Guess we need more self control.. :))

Should have painted it red.. really throw them off when you pop the trunk.
Title: Re: Cat 3126 Rebuild Odyssey
Post by: craneman on March 22, 2020, 08:14:34 pm
Looks like the whole west coast was division 6 once. I see no mention of Utah or Arizona teams, which are division 7 now.

Northwest is division 6 now, south is division 7. Which includes Hawaii

My number is 6348. Six is for division 6

Great clipping

CW
You are right the whole west coast was division 6. NHRA let me keep my lucky numbers for the years I raced the Centerline  and the Summit series. 77112 I had used them before joining NHRA That was my Chevelle in the photo
Title: Re: Cat 3126 Rebuild Odyssey
Post by: gracerace on March 23, 2020, 10:16:43 am
You are right the whole west coast was division 6. NHRA let me keep my lucky numbers for the years I raced the Centerline  and the Summit series. 77112 I had used them before joining NHRA That was my Chevelle in the photo

Looks like I was preaching to the choir? 
You were a bad A$$ dude.
Thanks for sharing.
CW
Title: Re: Cat 3126 Rebuild Odyssey
Post by: John44 on March 23, 2020, 11:55:30 am
Got lost on the Odessa part,part of the thinking is maybe other posters like the NHRA but have no clue when they search that
y'all are talking about it  when they see a title about a cat rebuild.