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Dan
Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1694
Experience:  Auto Technician
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I have a van with 81.000 miles after a complete overhaul of

Customer Question

i have a van with 81.000 miles after a complete overhaul of the engine. is a 6.0 chevy on a 2006 van express. the parts used are all aftermarket. after only 1000 miles on the new engine, the front seal in the engine failed (felpro), i replaced with a complete set and cover from GM oem. after 6000 the rear seal broken then i replace with new oem GM parts. now after 81.000 miles, the engine burns a bottle of oil every 3000 miles (1/4), i need to keep adding. i do not see oil in the ground or blue or white smoke from exhaust pipe. the engine works perfect whithout engine power loss. where can i check for a oil leak or maybe, as the parts were aftermarket, the engine repair comes to the end of the life after only 81.000 miles?
Submitted: 10 months ago.
Category: Chevy
Expert:  Dan replied 10 months ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Expert:  Dan replied 10 months ago.

Check your pcv valve. You may have excessive crankcase pressures which would cause seals to blow out.

Expert:  Dan replied 10 months ago.

You may be burning oil though the intake from the pcv valve if it is stuck.

Customer: replied 10 months ago.
where is the pcv valve? if is stuck can i clean it or just buy a new one? do you know a ob code which is in relation whith this?
Expert:  Dan replied 10 months ago.

This will not set a code. Have you had this scanned for codes?

Customer: replied 10 months ago.
i have a collection of codes in relation with exhaust sensors, poor mix, and leak in the canistier but i have been driving with that a lot of time.
Expert:  Dan replied 10 months ago.

Excessive crankcase pressure would be caused by poor piston ring seal or blow by.

Customer: replied 10 months ago.
i see that first i would check the pcv valve before remove the cyclinders...how can i check the pcv valve?do you think i have a problem in the piston rings?
Expert:  Dan replied 10 months ago.

You could do a compression test with a compression gauge. Make sure the pcv breather hose are not clogged as well.

Customer: replied 10 months ago.
where is the pcv valve?
Customer: replied 10 months ago.
i see in the diagram, that, the pcv valve is a tube? i should introduce something to check for debris?
Expert:  Dan replied 10 months ago.

Here is the other hose, the valve is built into the valve covers.

Customer: replied 10 months ago.
what cause the pcv valve is clogged? the oil brand? the oil filter? gasoline?
Expert:  Dan replied 10 months ago.

Yes to all.

Expert:  Dan replied 10 months ago.

Carbon build up causes the clog.

Customer: replied 10 months ago.
dan those tubes are hard to remove? can i do it for myself?
Expert:  Dan replied 10 months ago.

Not hard to remove, you can do this yourself, if the hoses are clear a compression test or leak down test would be the next step.

Customer: replied 10 months ago.
can i consider bad rings even when i do not see white smoke and the engine perform good?
Customer: replied 10 months ago.
maybe can be another seal i can consider to check?
Expert:  Dan replied 10 months ago.

A seal would cause an external leak.

Customer: replied 10 months ago.
Dan,
if the pcv valve is clean, what could cause the rings failure? bad lubrication due to bad oil pump?
Expert:  Dan replied 10 months ago.

They could be stuck from carbon build up as well