Help Diagnosing Oil leak

[lspann3525]

Well im back again with another oil leak after a couple of oil pan gasket changes,rear mail seal replacement and valve cover gasket replacement.

Lately ive noticed my 08 tahoe has been drinking oil so I decided to check the oil pan area and I discovered the front area of the oil pan is covered in oil. I doubt its the oil pan gasket. I replaced it maybe 10 months. Im trying to pin point this im thinking maybe timing cover seal or crankshaft seal??? Anything else in this area that can cause this mess. Heres a video.. any suggestions will help.

 

[donjetman]

Well im back again with another oil leak after a couple of oil pan gasket changes,rear mail seal replacement and valve cover gasket replacement.

Lately ive noticed my 08 tahoe has been drinking oil so I decided to check the oil pan area and I discovered the front area of the oil pan is covered in oil. I doubt its the oil pan gasket. I replaced it maybe 10 months. Im trying to pin point this im thinking maybe timing cover seal or crankshaft seal??? Anything else in this area that can cause this mess. Heres a video.. any suggestions will help.

Oil consumption:
Install a catch can and have you or a PO installed the improved driver side valve cover per GM TSB# 10-06-01-008M? https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf

When you had the pan off, I hope you installed a new oil pump to pickup tube o-ring? Also, a dab of rtv is needed where the parting line of the front & rear covers meet the oil pan gasket.

Last summer I changed the timing cover gasket, pulley, seal, o-ring, VLOM, etc, etc, etc:
https://www.tahoeyukonforum.com/threads/valley-cover-crank-pulley-etc.149036/

 

[lspann3525]

I havnt installed the updated valve cover yet. I installed new gm pick up tube o-ring and put 4 dabs of rtv where the block meets the covers.

I want to assure its the timing cover gasket sort of hard for me to tell where its coming from. I cleaned that area up during the last oil change so where the leak is coming from its getting worser.

What made you change your timing cover gasket?

 

[donjetman]

I havnt installed the updated valve cover yet.

In 2018 at 130k miles when we bought our road hard and hungup wet Yukon, the piston rings were stuck from sucking & burning oil because of the the poor original valve cover pcv design. Poor pcv performance/vacuum can cause crankcase gaskets to leak due to too much positive crankcase pressure. Today it has 199k miles and does NOT use any oil.

I installed new gm pick up tube o-ring and put 4 dabs of rtv where the block meets the covers.

thats good

What made you change your timing cover gasket?

It had a small oil leak from ?somewhere? on the front of the engine.
The 2 piece pulley balancer is held together with rubber and we all know rubber doesn't last forever so I changed it and the seal.

 

[donjetman]

In 2018, when I had the oil pan off, I also installed the afm valve deflector shield GM# 12639759 ($8) per the TSB instructions, even though my engine is NOT afm equipped.