hole in block?
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  • 2 Post By steelybill
500, 472, 425, 368 Discussion, hole in block? in Cadillac Engine Technical Discussion; Any idea what this is? The hole is the bolt closest to the oil pan by the freeze plug. We ...
  1. #1
    BigPoppaD is offline Cadillac Owners Member
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    hole in block?

    Any idea what this is? The hole is the bolt closest to the oil pan by the freeze plug. We were cleaning the engine and I think it was packed with dirt and whatever and it started dripping coolant. We stuck a short bolt in but I don't think it's threaded much if at all. Any ideas on what it is and what to do? It's still oozing. Safe to maybe add some sealer to the bolt? I believe this is a 73 472 that I'm dropping in my 78. Hole is on the passenger side

    Thanks
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  3. #2
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: hole in block?

    Looks like a coolant drain plug hole. IIRC they take a fine thread plumbing type bolt.

  4. #3
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: hole in block?

    It has a tapered thread. It takes pipe threaded bolt. Use teflon thread dope or teflon tape when replacing the plug.

  5. #4
    steelybill is offline Cadillac Owners Enthusiast
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    Re: hole in block?

    If I remember correctly, it needs a 1/8 NPT pipe plug. There should be one on the other side of the block also.....

  6. #5
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: hole in block?


  7. #6
    steelybill is offline Cadillac Owners Enthusiast
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    Re: hole in block?

    A 1/8 inch pipe plug can be found at a building supply, like Home Depot or Lowes.

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