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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8815
Experience:  I am ASE Master Truck Certified.
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I have an 06 c7 cat engine the engine runs good but has started

Customer Question

I have an 06 c7 cat engine the engine runs good but has started blowing oil out of the blowby tube accaisonally
Submitted: 2 years ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 2 years ago.
Hi. Thanks for asking your question! I will try and help you out.
There are three things I have seen cause this.
The first is a worn air compressor. It has cylinders just like the engine. When they wear. It will cause high crankcase pressure.
Second is a faulty turbo. They can fail and allow exhaust to go down the oil drain tube and cause high crankcase pressure.
And lastly is wear in the cylinders or broken piston rings. Unfortunately broken piston rings are common on these engines.
Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 2 years ago.
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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