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Thread: Rear main seal

  1. #1

    Rear main seal

    Rebuilt 1962 F 134. Complete rebuild to factory specs. This engine has a two piece split rear main oil seal. Took great care in installing the seal as if it leaks this is a very time consuming repair. You have to take the entire power train apart and half the motor. With all my care after startup I had a couple drops of oil. Has anybody ever used rear main seal leak stop added to the oil? I know this is a poor way to fix but IF it works a good 20 plus hours labor will be saved. Any opinions abut this?

  2. #2
    Super Moderator LarrBeard's Avatar
    Join Date
    Nov 2014
    Ft. Wayne, IN
    [QUOTE Any opinions abut this?[/QUOTE]

    Well, the first answer is "A couple of drops seem about right". For whatever reason, try as we will, seals just don't seal like they should. Maybe a few ten-thousandths of wear, or burnishing on the shaft - but they do drip. It takes a lot of drips to make a tablespoon. I just put cardboard under the drips.

    Now, about stop-leak. Another 20- hours to replace the seal could give you another leaky seal. I'd try the gunk for a thousand miles or so. If it seals, great. Drain it then. If not, live with the drip or tear it down again.

    Just an opinion - worth everything you've paid for it!

    Post pictures!

  3. #3
    You reinforced my thinking. That is what I am going to do.

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