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Very loud hissing sound and loss of power and black smoke .i…

Very loud hissing sound...

Very loud hissing sound and loss of power and black smoke .i have checked all the plumbing on the turbo can not find any leaks

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

07 peterbilt 379 cummins isx 870

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

Hopfully im on the side of the road right now

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Answered in 2 minutes by:
2/14/2020
Technician: Curtis B., Technician replied 2 years ago
Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 43,956
Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.
Verified

Welcome to JUST ANSWER heavy equipment. With years of experience, I look forward to doing my best to help.

Check the intake and exhaust manifold gaskets, where they bolt to the cylinder head. That could be the leak.

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Customer reply replied 2 years ago
Motor was rebuilt 300,000 agoCould it be the turbo
Technician: Curtis B., Technician replied 2 years ago

It can be, but leakings manifold will do the same thing.

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Customer reply replied 2 years ago
Ok im about 60 miles from a peterbilt dealer will it hurt the engine if i limp it in that far?...also i checked and all the gaskets look good on both sides ....there new ....no carbon around none of them.Hello?
Technician: Curtis B., Technician replied 2 years ago

No, it will not hurt, you just will not have the power.

Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 43,956
Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.
Verified
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Curtis B.
Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 43,956
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Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.

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