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4.3 GL-J oil pan gasket change

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  • 4.3 GL-J oil pan gasket change

    I am getting prepped to pull my engine for the first time to get a better look at why I continuously weep oil from between the timing cover and oil pan. With a mirror I can see what looks like possible damage on the oil pan around where the front part of the seal seats into it, so fully expecting to drop the oil pan to investigate and fix. It is a reman motor that previous owner put in, but appears to be original pan, so maybe it got dinged up while motor was being swapped.

    Couple questions:
    -Do I have to remove the flywheel cover/bellhousing to get the oil pan off and back on? Or can I just drop the pan straight down?
    -What type of adhesive/sealant is recommended for the 2 corners at the front and back that need a small bead?
    -Since I don't see any oil leakage from the front seal at the harmonic balancer (cover is always dry there) I am not expecting to have to remove the timing cover - I don't think that this is "wrong" to leave it there and just change the pan gasket, but please let me know if this raises questions.
    -Is there anything special about the volvo gasket for the oil pan? or will automotive work here?

    Side question: after reading up on procedure, I am clearly going to remove the front engine mounts using the lags. But why not just pull the top nuts and leave the mounts attached? I could see the lag holes loosening up if removed/replaced too often?

  • #2
    No need to remove flywheel
    I use silicone RTV in the corners
    Front cover should not be an issue
    Nothing special, its an auto gasket, just get a good brand like felpro

    Have remove lags and top nut and have no issue either way. Removing lags allows for easier remove/install, but must still loosen nuts for alignment. Removing nuts a bit harder to remove/install (not much)
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

    Comment


    • #3
      You might try posting this over on the Merc I/O forum, I recall achris posting something similar to this, with the newer style 4.3s and the plastic timing cover. Not sure how he resolved it, but eventually it was fixed.
      1988 Four Winns 200 Horizon
      4.3 OMC Cobra

      98 Jeep Grand Cherokee 4.0 Selectrac
      07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

      "While air doesn't freeze....rust never sleeps"

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      • #4
        Hey achris , link to your oil pan leak escapades please
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

        Comment


        • #5
          Originally posted by Scott Danforth View Post
          Hey achris , link to your oil pan leak escapades please
          This is the main one... https://forums.iboats.com/forum/engi...pdate?t=373060

          Here's a follow up... https://forums.iboats.com/forum/engi...-bilge-finally

          Good luck.

          Chris........
          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
          The world takes on a whole new perspective when viewed from 100’ below.
          1972 Bertram ‘Bahia Mar’ 20
          2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
          (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


          Comment


          • #6
            Thanks Chris
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

            Comment


            • #7
              Thanks guys. I did read achris' thread already, several times - very well documented and helpful. I think my timing cover is a different design though, and it feels like aluminum? Has the number 12391992 stamped near top front, and actually has a separate gasket that I can see from the top. Hoping I don't have to remove it. Don't see any signs of cracks from what I can see with a mirror.

              Felpro gasket is in stock locally, will pick up tomorrow. Everything except power steering and motor mounts is already undone and ready for this weekend, and hoist is reserved.

              To bolt the engine to a stand - I am assuming I have to remove the flywheel cover and use the bolt holes that it attaches to in order to hold the engine? But flywheel itself can stay. I only ever had one motor out before, and that was in an old YJ jeep years ago.

              Comment


              • #8
                assuming I have to remove the flywheel cover
                No, don't remove the cover, only remove a bolt to install a chain if lifting eye is not present.

                I like to use Two 1 inch web lifting straps. Place one strap under each exhaust manifold and hook over the top of the motor
                94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                07 Seadoo GTX
                Merc Adults Only VP Adults Only
                G-Dad always said "First Liar doesn't stand a chance"

                Comment


                • #9
                  I have the motor out and pan out, working on cleaning it up. Just cracked open the Fel-Pro box that I got, and it is not the right gasket. I cross-referenced off a late model chevy blazer to look it up at the auto parts store, got a Fel-Pro OS 30680 R. It is close, and looks like a really nice gasket, but too thick at the front to go into the Volvo oil pan, and has extra round nubs along the sides that won't work.

                  Anyone know the right cross-reference to get the correct gasket for a 4.3 GL-J oil pan?

                  Comment


                  • #10
                    What year is the motor?
                    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                    07 Seadoo GTX
                    Merc Adults Only VP Adults Only
                    G-Dad always said "First Liar doesn't stand a chance"

                    Comment


                    • #11
                      Boat is 2008 model, believe the pan is original to the boat. Engine also has stickers that indicate 2008. It is volvo part 21124852 for the gasket according to the parts diagrams, and the image shown in the diagram looks accurate to what I have.

                      Comment


                      • #12
                        I looked up the part number 30680R and it fits 4.3L from 1996 to 2006
                        In 2007, 2008 find gasket OS 30786R

                        The VP number should be 21124852
                        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                        07 Seadoo GTX
                        Merc Adults Only VP Adults Only
                        G-Dad always said "First Liar doesn't stand a chance"

                        Comment


                        • #13
                          AllDodge - you are a saint. That looks like it, now just need to find one locally. In the meantime I was trying to scrounge up more clues and found the casting part #'s on the bottom of the oil pan - GM 12590926 and 12593713.

                          Comment


                          • #14
                            Thanks again AllDodge. You saved my day. They had one right down the road, worked like a charm and the engine is back in and aligned up perfectly first shot.

                            I didn't see anything crazy wrong that would indicate why it was leaking, but there were multiple shades of RTV residue in the corners, so not sure if it got cleaned off well enough last time someone installed it. It should be good now. Spent about 2 hours carefully cleaning it all up. Timing cover is aluminum (not the plastic one that others have had issues with) and no signs of problems there, so left it alone.

                            Comment


                            • #15
                              Sign up today
                              Good to hear, I got tied up with other things. Those numbers and GM part numbers and not easy to find on line
                              94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                              95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                              07 Seadoo GTX
                              Merc Adults Only VP Adults Only
                              G-Dad always said "First Liar doesn't stand a chance"

                              Comment

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