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Cat Man
Cat Man, Cat Engine Expert
Category: Boat
Satisfied Customers: 8421
Experience:  23 years Caterpillar Engine Experience
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I have a cat c12 2001 KENWORTH Have replaced exhaust,

Customer Question

I have a cat c12 2001 KENWORTH
Have replaced exhaust, checked for leaks.
Motor sounds like it has exhaust leak under power during maximum boost
Any ideas could it be turbo
Cheers Doug ********
Submitted: 6 months ago.
Category: Boat
Customer: replied 6 months ago.
I have checked waste gate ....it is not seized !
Expert:  Cat Man replied 6 months ago.
Thanks for asking your question. I will try and help you out.
Yes it's possible the turbo is causing the the noise. I have seen it before. But I have also seen a plugged air filter or plugged muffler cause an exhaust noise as well. If you haven't already. I would change the air filter. If the noise continues. I would have the muffler checked for restriction. It can be checked by connecting an H2O gauge after the turbo. If you have more than 50 H2O while making max boost. The muffler is restricted.
Please reply back if you need more help or have more questions. I am happy to assist.
Customer: replied 6 months ago.
I am not sure if you have understood correctly....this Caterpillar C12 engine powers a Kenworth Truck
It may or may not be a marine issue perhaps a caterpillar mechanic.
Blocked air cleaner not the problem and exhaust is clear
Any further ideas
Cheers....Doug
Expert:  Cat Man replied 6 months ago.
Thanks for the information Doug.
If the air filter and exhaust are not restricted. And the wastegate is functioning, plus there are no evident exhaust leaks. I must suspect the turbo. It's all that is left.
Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 6 months ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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