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Cat c15 twin turbo acert. Recently developed whistle at

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higher rpms under load. Replaced...
Cat c15 twin turbo acert. Recently developed whistle at higher rpms under load. Replaced all cac boots, tested cac, no leaks. Took it to shop, the replaced all pulleys, noise quit for a day and then came back. I blocked off the wastegate the other day for a short bit and the whistle stopped, but when I unblocked the wastegate, it came back worse. Now, even blocking off the wastegate doesn't help. There is also oil blowing into the cac tubes from the high pressure turbo, and oil in bellow between low pressure and high pressure turbos.
Submitted: 3 years ago.Category: Medium and Heavy Trucks
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Answered in 8 minutes by:
7/21/2019
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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Thanks for asking your question. I will try and help you out.
Sounds like one of the turbos. Most often it’s the high pressure turbo. The one bolted to the manifold. I’d try changing it first.Please reply back if you need more help. I am happy to assist.
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Customer reply replied 3 years ago
I changed both turbos with new ones in September. No problems until April. I changed the lower turbo (the one that dumps into exhaust pipe) yesterday with the original one that came off the truck. You think it's the turbo I didn't change? Could it be just a leak where the turbo mounts to the exhaust manifold?
Technician: Cat Man, Cat Engine Expert replied 3 years ago
I would suspect the other turbo. Most whistles come from leaks in the piping. But if there are no leaks. All that’s left is the turbo.
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Cat Man
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