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Oil Pan Gasket Leak. Pull the Motor? (Re-post)

Discussion in 'Chevy C/K Truck Forum' started by ToddJ8633, Sep 10, 2012.

  1. ToddJ8633

    ToddJ8633 New Member

    Good evening
    I have a 1999 4*4 Tahoe. It was involved in a front end collision and was repaired. However the oil pan gasket has leaked ever since. I paid a shop to fix it about a year after the collision repair, it stopped leaking for about 2 months and then started leaking again. I'm active duty Army and moved shortly after the collision repair in AZ, then shortly again after the oil pan gasket in AL so I couldn't just take it back to the shop. I attempted (twice) to repair it myself. Once with a new gasket and no RTV, once with a new gasket and 2 tubes of RTV.
    Both times I had the truck on a lift and used a transmission jack to lift the transmission as far as it would go, however that is just barely far enough to get the oil pan in and out. It's still leaking. I paid $750 to have a few leaks repaired about 6 months ago and really would like to avoid paying another shop.
    I'm considering attempting it myself again but am wondering the easiest route: pull the motor or remove the front diff and axle? I'd like to have enough room to really inspect it, clean all the oil and let it dry and set a new gasket with RTV without having to cram it back into that tiny gap.
    What's the right way to do this?
  2. moogvo

    moogvo Epic Member 5+ Years 1000 Posts

    Have you considered that the pan may be slightly out of shape on the mating surface? If the pan bolts were tightened too much, the pan flange will sag between the bolt holes. It will hold for a while but soon enough it will leak again.
  3. 1997chevrolet

    1997chevrolet New Member

    way easier to pull the front diff assem and get to it that way! just pull 15mm bolts on cv shafts to diff, unplug 4x4 switch on diff, undo the breather line on top of diff, undo front driveshaft at diff, more than likely 4 or 5 bolts holding front diff in, remove them, and then the oil pan is free and can drop straight down, this is the way GM tech Si bulletins say to do it and this is the only way ill do it. make sure you lay empty oil pan on a flat surface to see if its twisted because of the wreck!
  4. ToddJ8633

    ToddJ8633 New Member

    Nice! Both very helpful answers! Thanks
  5. Sawfish

    Sawfish Member

    There is a gasket between the engine and the oil filter adapter on some 4 x 4 Chevy engines. A gasket leak will appear to be an engine oil leak and drive you crazy looking for the source. The adapter offsets the oil filter to clear the 4 x 4 drivetrain.

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