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Old 09-21-2013, 10:21 PM   #1
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Turbo boost suddenly a bit low

Turbo boost has always been 28 lb. Suddenly, it only goes to 24 lb. I've searched air hoses, checked the CAC, checked the turbo waste gate. All seems to be in order.

Fuel filters have been recently changed, in fact the secondary fuel filter was changed a few days before the loss of turbo boost.

A new air filter was installed last winter, about 2000 miles ago.

Any suggestions?

Cummins C8.3 mechanical engine, Banks Stinger Kit.
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Old 09-22-2013, 12:52 AM   #2
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possibly gauge malfunction, if the engine seems to be normal on power?
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Old 09-22-2013, 04:22 AM   #3
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Quote:
Originally Posted by jimkate View Post
Turbo boost has always been 28 lb. Suddenly, it only goes to 24 lb. I've searched air hoses, checked the CAC, checked the turbo waste gate. All seems to be in order.

Fuel filters have been recently changed, in fact the secondary fuel filter was changed a few days before the loss of turbo boost.

A new air filter was installed last winter, about 2000 miles ago.

Any suggestions?

Cummins C8.3 mechanical engine, Banks Stinger Kit.
Could your air filter have come apart? Did wasps build a nest in your air intake?

Bob
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Old 09-22-2013, 07:10 AM   #4
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Manifold leak? Which 8.3's are "known" for....
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Old 09-22-2013, 12:18 PM   #5
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I had a hole in my boost boot from rubbing the other turbo feed pipe on my 8.3. Mechanic readjusted the pipes and replaced the boot and no more problems.
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Old 09-22-2013, 08:41 PM   #6
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Well logic would tell you that if you changed a fuel filter couple of days before the boast dropped then that maybe your problem. If the fuel flow drops then on a Diesel engine the boost will drop. A Diesel engine is reverse to a gasoline engine. On a gas engine the exhaust gas temps will rise when the are leaned out but on a Diesel engine the more fuel the higher the EGT. The higher the EGT the faster you are going to spin the turbo and thus more boost
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Old 09-23-2013, 07:04 AM   #7
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Quote:
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Well logic would tell you that if you changed a fuel filter couple of days before the boast dropped then that maybe your problem. If the fuel flow drops then on a Diesel engine the boost will drop. A Diesel engine is reverse to a gasoline engine. On a gas engine the exhaust gas temps will rise when the are leaned out but on a Diesel engine the more fuel the higher the EGT. The higher the EGT the faster you are going to spin the turbo and thus more boost
That's a good point Mike. I'm ordering new filters. I'll change the fuel filters and check for any improvement.
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Old 09-23-2013, 08:32 PM   #8
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I've had 3 Monaco's an have had to repair 2 air charge coolers. You can check by spraying with soapy water and running the engine, if you have a leak it will blow bubbles both of mine were in the right bottom.
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Old 09-29-2013, 08:11 PM   #9
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Any chance you were in a hard driving rain lately? I can't tell where your intake air comes from.
Twice now I've gotten water encroachment down into the air filter from a hard side driving rain while stationary.

It'll pick up through the filter, and not sure why, they put the boost gauge hose at the 6 o'clock position and will get water in it.

Strange but true.
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Old 09-29-2013, 08:43 PM   #10
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I changed the fuel filters, checked the air filter (which is almost new). I checked all the air pipes, hoses, connections. I checked the CAC. Can't find a thing wrong.

Then I noticed that the exhaust manifold gaskets are leaking. In fact, one gasket is 'barking'. Then I remembered that about the same time that the turbo boost was suddenly a bit low, I commented to my wife that the Pac Brake didn't seem to be as effective as I thought it should be.

I'm taking the exhaust manifold off in the next few days.
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Old 09-30-2013, 04:35 AM   #11
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Having just been there, the "allowed run-out" for the exhaust manifold is 10/1000... Ours was 16/1000 and leaking badly. The Cummins people said it could be resurfaced but they weren't allowed to do it...so $1400 and change.
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Old 09-30-2013, 06:27 PM   #12
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Somehow, I think Jim Sanderson will be able to re-surface that manifold instead of $1400 for a new one. Right, Jim? LOL

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Old 10-01-2013, 06:41 AM   #13
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That's the plan Van. Unless it breaks in half in my hands. LOL !
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Old 10-02-2013, 06:20 PM   #14
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Jim I removed the manifold on our 99 Dip ISB for a manifold leak and found a grove cut in the head, I resurfaced the manifold repaired the grove with J B Weld and it was still holding 5 yrs later when we traded the coach, also replaced 1/2 of the manifold on out ISC 350 and Cummins has a thicker gasket for the repair. On both I sprayed the bolts and nuts on the manifold and turbo 3 or 4 times a day for 2 or 3 days and all bolts and nuts came loose with no problem. One of the best penetrats I think is Acetone and Tranf fluid mixed 50% each. Good luck and I hope you dont have a grove cut in the head from that leake.
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