Replacing head gasket on 1992 4.9

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HT4100 4.1, 4.5, 4.9 Discussion, Replacing head gasket on 1992 4.9 in Cadillac Engine Discussion; I have never worked on a cadillac but a friend is going through a divorce and broke and appears to ...
  1. #1
    needhelp is offline Cadillac Owners Member
    Automobile(s): NONE
    Join Date
    Aug 2010

    Replacing head gasket on 1992 4.9

    I have never worked on a cadillac but a friend is going through a divorce and broke and appears to have blown a head gasket on his car. I am willing to help but dont want to waste a lot of time and money if it is not fixable. The water pump went out and it was driven hot. You can fill radiator and drive down the drive way and it gushes the water out, I mean empties it in less than 2 minutes. Is it worth trying to fix head gaskets, or should we haul it off

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  3. #2
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
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    Oct 2004
    Oak Creek, WI

    Re: Replacing head gasket on 1992 4.9

    The head bolt threads in the block are not reusable. You must helicoil or timesert the threads in the block.

    That said, it's somewhat of an involved process. If the car is in poor shape, I wouldn't bother.

    If it's worth repairing and don't want the headbolt trouble, install a used engine.

  4. #3
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
    Automobile(s): 69 Thunderbird | 90 Seville | 89 Marquis | 72 Torino
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    Oct 2008
    Palm Bay, FL

    Re: Replacing head gasket on 1992 4.9

    You say it gushes water out.... From where? Are your sure that it is the head gasket? When you overheat and the coolant boils, the resulting over-pressure will blow out the weakest point in the system - usually a radiator hose connection or heater hose... The rad cap should blow at 16psi I believe but if anything is old and deteriorated it may be weaker than that. Hopefully it's not as bad as you think.... It depends how long it was driven after the w/p went. If you warped a cylinder head then forget it.

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  6. #4
    daniel58 is offline Cadillac Owners Fanatic
    Automobile(s): 58 Coupe Deville, 77 Coupe deville, 90 Deville
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    Sep 2009

    Re: Replacing head gasket on 1992 4.9

    I wouldn't think the eng would even run with coolant loss like that from a head gasket, it would hydro lock. In addition to things already mentioned check that coolant pipe that runs under the engine and the plastic side tanks on the radiator. Also if the waterpump was replaced check around the front cover, it is easy to over torque those fasteners. The FSM for my 90 4.5 has torque specs which are way to high and will cause distortion to the front cover if you follow the book as I learned the hard way.

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