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401 Nailhead Leak

Discussion in 'The Hokey Ass Message Board' started by iafraser39, Jul 13, 2012.

  1. iafraser39
    Joined: Aug 2, 2009
    Posts: 156

    iafraser39
    Member
    from Warmland

    Can anyone out help me solve the leak problem where the "O" ring
    sits on the timing cover and under the water crossover. I have tried to fix it 3 times, each with a new "O" ring, but the leak persists. I have tried lots of gasket goo , but no success. I made sure it was very clean before
    instaling . Thanks for the help
     
  2. cmyhtrod
    Joined: Nov 29, 2008
    Posts: 360

    cmyhtrod
    Member
    from ct

    Maybe too much gasket goo... All an O ring needs a smear of grease or vasoline so that it will slide into place without getting damaged. Is the housing that the O ring goes into in good shape?
     
  3. Buford
    Joined: Aug 30, 2001
    Posts: 314

    Buford
    Member

    I've heard you can double the O ring that really helps, and maybe use silicone. Good luck, Frank
     
  4. XWYNNSGUY
    Joined: Dec 7, 2008
    Posts: 103

    XWYNNSGUY
    Member

    Glue the gaskets to the crossover, put a small amount of grease on the block surface so you can slide it into place without moving anything. Make sure the hole is clean and dry, do the two oring thing and a bead of silicone on top of the water pump housing, tighten it up. Now don't do anything else till tomorrow. You should be good to go!!
     

  5. therealjakeg
    Joined: Oct 14, 2008
    Posts: 73

    therealjakeg
    Member

    There is two o rings. Upper and lower that you need to have.
     
  6. iafraser39
    Joined: Aug 2, 2009
    Posts: 156

    iafraser39
    Member
    from Warmland

    I had hat same problem with my 401. The fix is to use the correct
    gaskets where the crossover bolts to the cylinder heads.
    Do not use felpro, they are not the correct thickness. You can get
    the correct ones from Centerville Auto, Russ Martin.
    Cheers
     

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