Compression test for head gasket?

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Northstar Engines and System Technical Discussion Discussion, Compression test for head gasket? in Cadillac Engine Discussion; Will a bad head gasket show up as low compression in a cylinder on the N*? I bought a used ...
  1. #1
    Spyder's Avatar
    Spyder is offline Cadillac Owners Master
    Automobile(s): None now...1972 Challenger=my pride and joy.
    Join Date
    May 2004
    Sonoma Co, CA

    Compression test for head gasket?

    Will a bad head gasket show up as low compression in a cylinder on the N*? I bought a used one for my 94 STS, and while the compression test shows great, I'm worried about the headgaskets failing at some point in the future. Thanks!

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Compression test for head gasket?

    I doubt it. It would have to be one hell of a bad gasket to do that. I think the only way to tell is pressurize each cylinder and see it it holds air for :10-:15 minutes.

  4. #3
    sts96 is offline Cadillac Owners Fanatic
    Join Date
    May 2004

    Re: Compression test for head gasket?

    A really bad gasket might show up . I set the engine up on the stand pluged all but the highest coolant hole filled with water and air pressure tested each cyl in the firing order (fewer turns of engine w/o oil pressure) to check for gasket leaks .

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