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Topic: Boost issue and Cat 3126 parts (Read 5042 times) previous topic - next topic

Boost issue and Cat 3126 parts

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 –
Use Gates tensioner, different and best in every way.

Re: Boost issue and Cat 3126 parts

Reply #2 –
Chris, I  am  getting a little over 24 lbs of boost I believe.
John

Re: Boost issue and Cat 3126 parts

Reply #3 –
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 –
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 –
Quote from: wolfe10 –
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 –
Do the newer coaches have a pyrometer & boost gauge? I sure miss them on ours!  ???

Re: Boost issue and Cat 3126 parts

Reply #7 –
Mine did not come with one; has one now.

John

Re: Boost issue and Cat 3126 parts

Reply #8 –
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 –
Quote from: wolfe10 –
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 #13 –
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 –
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 –
I googled that number with tensioner on the end and got multiple sources.

Re: Boost issue and Cat 3126 parts

Reply #16 –
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 –
Quote from: Pierce & Gaylie Stewart –
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 –
Quote from: Pierce & Gaylie Stewart –
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 –
Quote from: gracerace –
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