Hello everybody

I have engine oil leak in my 00 gmc jimmy, before few months I have replaced the oil pan gasket, timing cover gasket, rear main seal , oil pump , oil pickup tube and oil cooler adapter gasket but the problem now again engine oil leak from two different places. It leaks from the bottom middle of timing cover between oil pan gasket and timing cover and from the cap that exactly below torque convertor rear side of transmission.

I just want to know why it leaks again and what can I do now to stop the leak ?


Thank you

 

first guess, a new seal didnt seal.

The surfaces MUST be perfectly clean metal, no oil, grease or rust, and fasteners like timing cover screws *should* thread into clean threads. Gaskets and seals dont like dirty surfaces.

You replaced all the right parts but it may be a contaminated surface or a screw that has backed out. (?)

Fasteners should be instalked with low strength Loctite so they cant come loose. Old lockwashers must all be replaced.

Also a stuck PCV valve can cause increased crankcase pressure that blows oil out.

Unfortunately it might be necessary to do some of the work again, not easy on the S series.