Boost issue and Cat 3126 parts

Topic: Boost issue and Cat 3126 parts (Read 2268 times) previous topic - next topic

Boost issue and Cat 3126 parts

April 02, 2017, 10:11:05 pm

Hi All, we are home after 3 months.It was like having our home with us!
I did the search thing, couldn't find what I am looking for on this sight.
Would any one have the part numbers for these 2 items, or even a place to purchase online.

Or has anyone had these issues

1997 U295 300HP Cat 3126

Belt tensioner for hydraulic pump (belt won't stop squeaking with new belt, even with dressing)
Going go try new tensioner
#00317 on tensioner doesn't work as a part #

Waste Gate solenoid (looks to be vacuum operated)

Silverleaf briefly threw a code a 3 times , along with brief check engine light.Always when cold, then went away.
Code then cleared in SL
Code was 102 01 boost pressure fault
Boost on the way home was 21.7 max, a couple of times it was only 18.1.
My thinking is the waste gate is sticking open partially, or erratically at times
What kind of boost does your stock 3126 Cat see?
Idling was .0...till reve'd up, then 1.5-2.0....I hear 1.3 is more normal idling?
Any help would be great
Thanks in advance
Chris

Re: Boost issue and Cat 3126 parts

Reply #1 – April 03, 2017, 12:12:36 am

Use Gates tensioner, different and best in every way.

Re: Boost issue and Cat 3126 parts

Reply #2 – April 03, 2017, 08:28:01 am

Chris, I am getting a little over 24 lbs of boost I believe.
John

Re: Boost issue and Cat 3126 parts

Reply #3 – April 03, 2017, 08:36:13 am

Two things:

Call the Caterpillar RV Hotline with your engine serial number. They can tell you how much boost you engine SHOULD make. 877 777-3126.

Check for exhaust leaks which would reduce max boost: head to exhaust manifold, manifold itself and manifold to turbo. Just look for any signs of soot/black.

Re: Boost issue and Cat 3126 parts

Reply #4 – April 03, 2017, 09:22:02 am

Just called hotline (Thank you Brett) My engine had tested out at the factory with 26lbs boost and 46psi oil pressure.
John

Re: Boost issue and Cat 3126 parts

Reply #5 – April 03, 2017, 09:31:18 am

Quote from: wolfe10 – April 03, 2017, 08:36:13 am

Two things:

Call the Caterpillar RV Hotline with your engine serial number. They can tell you how much boost you engine SHOULD make. 877 777-3126.

Check for exhaust leaks which would reduce max boost: head to exhaust manifold, manifold itself and manifold to turbo. Just look for any signs of soot/black.

Thank you

Re: Boost issue and Cat 3126 parts

Reply #6 – April 03, 2017, 12:09:08 pm

Do the newer coaches have a pyrometer & boost gauge? I sure miss them on ours!

Re: Boost issue and Cat 3126 parts

Reply #7 – April 03, 2017, 12:17:50 pm

Mine did not come with one; has one now.

John

Re: Boost issue and Cat 3126 parts

Reply #8 – April 03, 2017, 12:42:08 pm

Have never seen a motorhome that came OE with an EGT gauge/pyrometer. And, unless you change the factory fuel and/or boost specs, no need for one.

Said another way, the factory settings prevent excessively high EGT's.

Re: Boost issue and Cat 3126 parts

Reply #9 – April 03, 2017, 12:50:48 pm

Quote from: wolfe10 – April 03, 2017, 12:42:08 pm

Have never seen a motorhome that came OE with an EGT gauge/pyrometer. And, unless you change the factory fuel and/or boost specs, no need for one.

Said another way, the factory settings prevent excessively high EGT's.

Newell Coaches with the 8v92 came with a dual pyrometer on the dash, read left and right banks.
Believe early bluebirds had them also .

Re: Boost issue and Cat 3126 parts

Reply #10 – April 03, 2017, 01:25:50 pm

Quote from: jcus – April 03, 2017, 12:50:48 pm

Newell Coaches with the 8v92 came with a dual pyrometer on the dash, read left and right banks.
Believe early bluebirds had them also .

Duals? Wow!

Re: Boost issue and Cat 3126 parts

Reply #11 – April 03, 2017, 01:36:00 pm

Murphy-Murphy 300-1200F Dual Port Mechanical Exhaust Pyrometer - 10705146-107...

Re: Boost issue and Cat 3126 parts

Reply #12 – April 03, 2017, 02:16:52 pm

Quote from: mike leary – April 03, 2017, 12:09:08 pm

Do the newer coaches have a pyrometer & boost gauge? I sure miss them on ours!

I can watch boost, among other engine perimeters via the Silverleaf VMS. It's plugged in the engine harness (aftermarket accessory).

SilverLeaf Electronics, Inc. | Knowledge is Horsepower

Re: Boost issue and Cat 3126 parts

Reply #13 – April 04, 2017, 10:07:56 am

I am going to put this here to store in search history

Our 3126 Cat Hydraulic pump belt tensioner :

Dayco # 89408

Gates # 38504

I had a hard time getting the correct #, even with all the numbers on the old Dayco one.
The Dayco old number on the tensioner is : 3922900. That number did not come up when searching, but was in the interchange numbers on the one I bought.
I got a gates on Ebay for $50.00 delivered
Not sure how much they are at Napa, was told they are one of the distributors for Gates tensioners

Items in Grand Tex Auto Parts store on eBay!

Re: Boost issue and Cat 3126 parts

Reply #14 – April 04, 2017, 11:31:15 am

Chris,

This looks exactly like the tensioner fitted to side radiator U300s. $55 delivered is a real deal. I know Bill Chaplin replaced his. How about a part number on yours Bill?

Pierce

Re: Boost issue and Cat 3126 parts

Reply #15 – April 05, 2017, 06:37:19 am

I googled that number with tensioner on the end and got multiple sources.

Re: Boost issue and Cat 3126 parts

Reply #16 – April 05, 2017, 06:58:59 am

I ordered 1 from Grand Tex also, compared to Napa and others, the price was quite a bit cheaper.

John

Re: Boost issue and Cat 3126 parts

Reply #17 – April 05, 2017, 10:21:31 am

Quote from: Pierce & Gaylie Stewart – April 04, 2017, 11:31:15 am

Chris,

This looks exactly like the tensioner fitted to side radiator U300s. $55 delivered is a real deal. I know Bill Chaplin replaced his. How about a part number on yours Bill?

Pierce

I did a best offer deal, got it for $50.00 delivered. The guy was very helpful too.
Cheers

Re: Boost issue and Cat 3126 parts

Reply #18 – April 05, 2017, 10:24:25 am

Quote from: Pierce & Gaylie Stewart – April 04, 2017, 11:31:15 am

Chris,

This looks exactly like the tensioner fitted to side radiator U300s. $55 delivered is a real deal. I know Bill Chaplin replaced his. How about a part number on yours Bill?

Pierce

Be careful. They all look alike, but there are multiple ones. The tension may be different. This is a Frieghtlinner Cummins one.

Re: Boost issue and Cat 3126 parts

Reply #19 – April 14, 2017, 03:27:21 pm

Quote from: gracerace – April 04, 2017, 10:07:56 am

I am going to put this here to store in search history

Our 3126 Cat Hydraulic pump belt tensioner :

Dayco # 89408

Gates # 38504

I had a hard time getting the correct #, even with all the numbers on the old Dayco one.
The Dayco old number on the tensioner is : 3922900. That number did not come up when searching, but was in the interchange numbers on the one I bought.
I got a gates on Ebay for $50.00 delivered
Not sure how much they are at Napa, was told they are one of the distributors for Gates tensioners

Items in Grand Tex Auto Parts store on eBay!

More info for the records....I decided to replace the Cat Engine main belt tensioner also

3126 Cat, main belt tensioner:

Dayco 89408

Gates 38511

And yes, they look totally alike . Went with the Gates, way better looking. Same price

NEW Gates Belt Tensioner Assembly 38511 Freightliner International 1990-2009...

This place is awesome

Re: Boost issue and Cat 3126 parts

Reply #20 – April 14, 2017, 03:34:37 pm

Quote from: wolfe10 – April 03, 2017, 08:36:13 am

Two things:

Call the Caterpillar RV Hotline with your engine serial number. They can tell you how much boost you engine SHOULD make. 877 777-3126.

Check for exhaust leaks which would reduce max boost: head to exhaust manifold, manifold itself and manifold to turbo. Just look for any signs of soot/black.

Thanks Wolfe10
Yup, finally had time to look. Appears to be leaking for sure at manifold to block. You can see it spit raw fuel out when cold. Possibly the turbo to manifold is also leaking.
Going to clean the engine all up, we are going to pull the manifold with the turbo attached, and go through it all. Probably replace the Waste Gate solenoid also.May have manifold re-surfaced
Cheers

Re: Boost issue and Cat 3126 parts

Reply #21 – April 14, 2017, 03:48:39 pm

You've got a hot rod CAT, do you have a boost/pyrometer on board?

Re: Boost issue and Cat 3126 parts

Reply #22 – April 14, 2017, 06:48:43 pm

Quote from: mike leary – April 14, 2017, 03:48:39 pm

You've got a hot rod CAT, do you have a boost/pyrometer on board?

Just boost, no pyrometer...Boost is in the Silverleaf

Re: Boost issue and Cat 3126 parts

Reply #23 – April 30, 2017, 10:47:03 pm

Update........ Got her apart. Blown exhaust gasket in 2 places. Also a small leak at the waste gate, but on the discharge side.
Turbo is fine, small side play. Going to see about getting it freshened local. going to send the manifold to my guy, have it surfaced.
We tested the Waste gate solenoid, it was fine. Waste gate is closing good too.
The Cat 800 number was really nice.Found lots out about our engine when it was on the dyno.
Cheers

Re: Boost issue and Cat 3126 parts

Reply #24 – April 30, 2017, 10:52:35 pm

If the intake and exhaust halves are good consider getting a reman turbo cartridge,would be cheaper then a whole turbo.

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