Rear Main Seal leak

Mopar General Discussions

  1. SuperStock426

    SuperStock426 FABO Gold Member FABO Gold Member

    Messages:
    374
    Likes Received:
    258
    Joined:
    May 20, 2020
    Location:
    Fort Oglethorpe Georgia
    Local Time:
    3:30 PM
    Fired up my 440 on Monday. Everything sounded good, good oil pressure, no over heating issues. Ran it for 20 minutes at 2000 rpm's to break in the cam. Then alas I look under the car and see a puddle of oil. Put it on the lift and wouldn't you know it, the rear main seal was leaking. When I built this engine I installed the "red" high performance rear main seal from Fel-Pro. Everything was done correctly except I didn't stagger the rear main seal. The engine was built in 2014 and fired it up this past Monday. Is it possible after sitting for nearly 7 years on an engine stand that the rear seal could have dried out? I ordered a new red seal along with a stock type rubber one to get the side seals as the red one doesn't come with side seals. I dropped the drag link and the oil pan, pulled out the main seal bridge and the rear main cap. Cleaned everything thoroughly and re- installed it with the stock type seal except this time I staggered it. Hopefully it'll seal up this time. Has anyone else had this issue?
     
    Last edited: Feb 27, 2021
  2. pishta

    pishta I know I'm right....

    Messages:
    19,686
    Likes Received:
    9049
    Joined:
    Oct 13, 2004
    Location:
    Tustin, CA
    Local Time:
    12:30 PM
    always stagger. Just makes sense on these split rear main seals.
     
  3. SuperStock426

    SuperStock426 FABO Gold Member FABO Gold Member

    Messages:
    374
    Likes Received:
    258
    Joined:
    May 20, 2020
    Location:
    Fort Oglethorpe Georgia
    Local Time:
    3:30 PM
    If the one piece rear main seal had been available when I built this engine I'd of got one.
     
  4. inertia

    inertia Well-Known Member

    Messages:
    3,454
    Likes Received:
    726
    Joined:
    Feb 4, 2011
    Location:
    Victoria B.C. Canada
    Local Time:
    12:30 PM
    Last edited: Feb 27, 2021
  5. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

    Messages:
    19,628
    Likes Received:
    8076
    Joined:
    Dec 7, 2006
    Location:
    PLANT CITY FL. and PERRY GA.
    Local Time:
    3:30 PM
    Is this a BB? If so it may be one of two problems. Maybe the seal was installed backwards, or the rear main seal cap may have had the bottom of the bolt hole knocked out by using to long of bolts. Like this one pictured.

    C473A10D-8AC4-482F-9D51-8188409FCD59.jpeg
     
    • Thanks! Thanks! x 1
    • SuperStock426

      SuperStock426 FABO Gold Member FABO Gold Member

      Messages:
      374
      Likes Received:
      258
      Joined:
      May 20, 2020
      Location:
      Fort Oglethorpe Georgia
      Local Time:
      3:30 PM
      Yes. It's a 440. Seal was installed correctly. I double checked it . The seal bridge looked fine.
       
    • SGBARRACUDA

      SGBARRACUDA ROY FABO Gold Member

      Messages:
      19,628
      Likes Received:
      8076
      Joined:
      Dec 7, 2006
      Location:
      PLANT CITY FL. and PERRY GA.
      Local Time:
      3:30 PM
      Remove the two pan bolts in that seal cap and use a ice pick or something like it and see if the bolt holes have a bottom.
       
    • SuperStock426

      SuperStock426 FABO Gold Member FABO Gold Member

      Messages:
      374
      Likes Received:
      258
      Joined:
      May 20, 2020
      Location:
      Fort Oglethorpe Georgia
      Local Time:
      3:30 PM
      I removed it today when I cleaned it up and reinstalled it with a new staggered seal. I closely inspected it when I cleaned it up and everything looked good. The oil pan is still off of the engine so I'll double check the bolt holes.
       
      • Agree Agree x 1
      • pishta

        pishta I know I'm right....

        Messages:
        19,686
        Likes Received:
        9049
        Joined:
        Oct 13, 2004
        Location:
        Tustin, CA
        Local Time:
        12:30 PM
        One piece rear main seal...how the heck? I think its still unavailable because.....
         
        • Agree Agree x 1
        • Joey4speed

          Joey4speed FABO Gold Member FABO Gold Member

          Messages:
          1,298
          Likes Received:
          982
          Joined:
          Jul 17, 2018
          Location:
          Coastal NC
          Local Time:
          3:30 PM
          I had the Viton rubber with the billet cap available from Mancini Racing, twice on my 383...
          Still leaks.
           
        • pishta

          pishta I know I'm right....

          Messages:
          19,686
          Likes Received:
          9049
          Joined:
          Oct 13, 2004
          Location:
          Tustin, CA
          Local Time:
          12:30 PM
          s-l500.jpg
           
          • Agree Agree x 1
          • ch1ll

            ch1ll FABO Gold Member FABO Gold Member

            Messages:
            897
            Likes Received:
            337
            Joined:
            Jun 12, 2009
            Location:
            Belgium,wi
            Local Time:
            2:30 PM
            Did you inspect the knurling on the crankshaft where the seal rides? If the knurling grooves are worn its always going to leak.
             
          • pishta

            pishta I know I'm right....

            Messages:
            19,686
            Likes Received:
            9049
            Joined:
            Oct 13, 2004
            Location:
            Tustin, CA
            Local Time:
            12:30 PM
            and if its a reverse rotating boat motor crank, the wick lines are the wrong direction......Now that would be a WTF moment!
             
            • Agree Agree x 1
            • Bewy

              Bewy Well-Known Member

              Messages:
              442
              Likes Received:
              235
              Joined:
              Jan 1, 2021
              Location:
              Australia
              Local Time:
              5:30 AM
              Is there a one piece rear main seal available for the 440?
               
            • oldkimmer

              oldkimmer FABO Gold Member FABO Gold Member

              Messages:
              18,893
              Likes Received:
              6229
              Joined:
              Nov 11, 2006
              Location:
              Kindersley, Saskatchewan,
              Local Time:
              2:30 PM
              . There is something but I can’t really remember. I read about it on FBBO. About $75.00. Supposed to never leak. Kim
               
            • SGBARRACUDA

              SGBARRACUDA ROY FABO Gold Member

              Messages:
              19,628
              Likes Received:
              8076
              Joined:
              Dec 7, 2006
              Location:
              PLANT CITY FL. and PERRY GA.
              Local Time:
              3:30 PM
              One piece with a flange is not possible.
               
            • famous bob

              famous bob mopar misfit

              Messages:
              19,402
              Likes Received:
              8486
              Joined:
              Aug 14, 2011
              Location:
              okla
              Local Time:
              2:30 PM
              yes there is , about $75 or so , you have to split it w/ a razor blade to install it . but it will only have one seam in it , which u put up in the block around a 12 o`clock position ------
              My rear main seal housing was cast and drilled offset , I fitted it up to the block all cleaned up and w/ no side seals , just the cranl seal in it , it set off to one side . Bought an aftermarket billet one .
               
            • SGBARRACUDA

              SGBARRACUDA ROY FABO Gold Member

              Messages:
              19,628
              Likes Received:
              8076
              Joined:
              Dec 7, 2006
              Location:
              PLANT CITY FL. and PERRY GA.
              Local Time:
              3:30 PM
              Well then like I said with a flange, it is impossible to install a ONE piece seal! If you have to cut it, it is not a one piece seal.
               
            • famous bob

              famous bob mopar misfit

              Messages:
              19,402
              Likes Received:
              8486
              Joined:
              Aug 14, 2011
              Location:
              okla
              Local Time:
              2:30 PM
              SURE IT IS , ALL ONE PIECE , U DONT SEPARATE IT !----LOL
              I KINDA LIKE THE IDEA, BUT NOT $75 WORTH .
               
            • SGBARRACUDA

              SGBARRACUDA ROY FABO Gold Member

              Messages:
              19,628
              Likes Received:
              8076
              Joined:
              Dec 7, 2006
              Location:
              PLANT CITY FL. and PERRY GA.
              Local Time:
              3:30 PM
              Ok.
               
            • oldkimmer

              oldkimmer FABO Gold Member FABO Gold Member

              Messages:
              18,893
              Likes Received:
              6229
              Joined:
              Nov 11, 2006
              Location:
              Kindersley, Saskatchewan,
              Local Time:
              2:30 PM
              There is a write up on Fbbo about the installation. Kim
               
            • Joey4speed

              Joey4speed FABO Gold Member FABO Gold Member

              Messages:
              1,298
              Likes Received:
              982
              Joined:
              Jul 17, 2018
              Location:
              Coastal NC
              Local Time:
              3:30 PM
              Didn't I hear of an egine builder that bored a recess in the rear cap assembly, then it was able to accept a 1 piece GM seal?
               
            • SGBARRACUDA

              SGBARRACUDA ROY FABO Gold Member

              Messages:
              19,628
              Likes Received:
              8076
              Joined:
              Dec 7, 2006
              Location:
              PLANT CITY FL. and PERRY GA.
              Local Time:
              3:30 PM
              Look at your crank right behind your flywheel or flex plate, and tell me how you can adapt a Chubby or any other one piece seal?
               
              • Agree Agree x 3
              • SuperStock426

                SuperStock426 FABO Gold Member FABO Gold Member

                Messages:
                374
                Likes Received:
                258
                Joined:
                May 20, 2020
                Location:
                Fort Oglethorpe Georgia
                Local Time:
                3:30 PM
                Fastfish sells them.
                 
              • SuperStock426

                SuperStock426 FABO Gold Member FABO Gold Member

                Messages:
                374
                Likes Received:
                258
                Joined:
                May 20, 2020
                Location:
                Fort Oglethorpe Georgia
                Local Time:
                3:30 PM
                It has a Ohio Crankshaft 4340 race crank in it.
                 
              1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                By continuing to use this site, you are consenting to our use of cookies.