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  1. #1
    Join Date
    Jun 2018
    United States

    Default Oil pan rear mating surface

    Changing the leaking oil pan gasket in my 89 XJ 4.0. P.O. used a cork multi piece and the RTV started working itself out of the front. I replaced it with a Felpo but it leaked and dripped from inside the flywheel cover plate. I dropped the pan again, and thought maybe the P.O. was on to something due to the ďseen better daysĒ condition of the pan. I replace the Felpo with a multi piece cork gasket. It leaked again, same area.
    I donít think itís the RMS because the P.O. just replaced it recently.
    Any-hoo, I was looking at the area where the pan bolts up to the block. Specifically the end cap area. Thereís a black gasket/seal on the crankshaft that lines up with the curve on the back of the oil pan gasket. It looks exactly like the rubber rear seal that came with the multi piece cork gasket. I tried matching them, without removing the piece on the crank. The pan gasket part seems to be smaller but I could be wrong.
    Does the rear curve of the pan gasket mate to this piece of rubber? Or did I fail (miserably) to remove the black rubber gasket from the P.O. multi piece gasket? Itís seated pretty good and I didnít want to just pull it off in case it was supposed to be there. Also, I canít remember if I removed the black rubber seal from the first pan drop due to growing up in the Ď70s

  2. #2
    Join Date
    Sep 2009
    Chico, CA

    Default Re: Oil pan rear mating surface

    That black rubber seal over the crank bearing caps is supposed to be removed and replaced. Most gaskets should have this. Most have a little tab that fits into a notch on the cork so they will seal around each other.
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    And a bunch of other stuff

  3. #3
    Join Date
    Jun 2018
    United States

    Default Re: Oil pan rear mating surface

    Yep, Thanks for the reply. First time inside an oil pan. The way it was stuck in the bearing cap groove I just figured it was part of the engine. Thatís why that gasket never sealed. On the plus side, Iím getting really good at dropping the oil pan. Thanks again

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