Mid Year Front Seal leak - NCRS Discussion Boards

Mid Year Front Seal leak

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  • Jim H.
    Expired
    • January 1, 2005
    • 52

    Mid Year Front Seal leak

    Group:
    I recently got my 327/350hp back and installed. For the most part all is fine and the engine works well after some fine tuning. I have a leaky front seal in the timing chain cover. I'm told by the engine builder that I should expect some seepage, but besides seepage I have a few drops of oil on the floor. Does anyone else have this issue? My feeling is that the front seal is bad or installed wrong or both.
    Thoughts please.
    Thanks
    Jim Hilton
    43119
  • John D.
    Extremely Frequent Poster
    • December 1, 1979
    • 5507

    #2
    Re: Mid Year Front Seal leak

    Jim, It shouldn't leak for sure. I'd ask the engine builder fix it if it were mine. John

    Comment

    • Clem Z.
      Expired
      • January 1, 2006
      • 9427

      #3
      you should put some lube on the seal and damper

      so the seal does not "burn up" when you start a fresh engine. it takes time for the oil to get to the seal on a fresh rebuild and a "dry" start will screw the seal up.

      Comment

      • Stephen L.
        Extremely Frequent Poster
        • May 31, 1984
        • 3158

        #4
        Re: Mid Year Front Seal leak

        You might have a groove in the crankshaft fro the original seal. Ask if the engine builder installed a sleeve on the crank that came with the seal

        Comment

        • Mark #28455

          #5
          sleeve on dampener *NM*

          Comment

          • Stephen L.
            Extremely Frequent Poster
            • May 31, 1984
            • 3158

            #6
            Re: sleeve on dampener

            OOps, Your right! The surface of the dampener is what the seal is in contact with, not the crank shaft itself, so the sleeve would go on the dampener.

            Comment

            • Frank C.
              Expired
              • January 1, 1986
              • 277

              #7
              Re: Mid Year Front Seal leak

              Jim....besides all the comments from others another thing to watch for is a cracked keyway in the hub of the dampener. A little hard to detect if your just looking at it. I've seen several with a crack and it will leak oil. Although quite common on BB engines I have seen mouse motors with the crack....Regards Frank

              Comment

              • Clem Z.
                Expired
                • January 1, 2006
                • 9427

                #8
                you should put a dab of non hardeneing

                sealer on the front end of the key to seal that area also from leaking oil. if the leak is from the keyway the oil will be on the face of the damper and on the back if it is the crank area seal

                Comment

                • Michael B.
                  Very Frequent User
                  • June 18, 2007
                  • 400

                  #9
                  Re: you should put a dab of non hardeneing

                  Another thing with SBC that often appears to be a front seal leak is the passenger side upper accessory mounting bolt hole. This bolt hole needs a bolt in it and it should have the threads sealed. New crank seals should not seep, even a little. Your engine builder doesn't want to accept the responsibility.




                  Attached Files

                  Comment

                  • Frank C.
                    Expired
                    • January 1, 1986
                    • 277

                    #10
                    Re: you should put a dab of non hardeneing

                    Clem...with all due respect, I want to know if there is a problem and if you mask it you wont know if the balancer is ready to leave the scene of the accident...Regards Frank

                    Comment

                    • Mark #28455

                      #11
                      Keyway is not exact size of key

                      The crank with key installed does not exactly fit the dampener. The keyway in the dampener is a little deeper than needed in case the key was not exactly inserted - remember, the production line cranked these engines out at a high rate. AFAIK the factory always sealed the keyways, otherwise they'll leak oil, but then again, my experience is 99% BB engines.
                      Mark

                      Comment

                      • Clem Z.
                        Expired
                        • January 1, 2006
                        • 9427

                        #12
                        same thing applies to the differential yoke

                        because if you do not use a thin layer of sealer on the splines you could have a leak

                        Comment

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