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spankyjr1
spankyjr1, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 2516
Experience:  I worked on all types of equipment semis,forklifts,farm,ect.
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My detroit 12.7 has started blowing valve cover seals and

Customer Question

My detroit 12.7 has started blowing valve cover seals and oil pan seals have wash screen in valve cover but still does it
JA: What's the make/model/year of your truck? Engine type?
Customer: 179 peterbilt 12.7 detroit
JA: Are you fixing your truck yourself? What have you tried so far?
Customer: Took valve cover off wash screen reseal oil pan ck blow by tube
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: No
Submitted: 20 days ago.
Category: Medium and Heavy Trucks
Expert:  spankyjr1 replied 20 days ago.

This can be caused by turbo dumping boost pressure down drain tube, turbo would need to be replaced

air compressor can put pressure in crankcase, this would be noticed anytime engine is running blowing out breather tube

worn cylinders you would have low power and smoke, also bad fuel economy,

If you are not using oil, and it does not have heavy blow by running at high RPM, then this is most likely a turbo dumping during boost condition while driving

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Expert:  spankyjr1 replied 18 days ago.

Just checking in to make sure you got this taken care of?
Please use the star rating system at top of page so I get credit from the site for my time.

Thank you

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