HT4100 4.1, 4.5, 4.9 Discussion, Replacing head gasket on 1992 4.9 in Cadillac Engine Technical Discussion; I have never worked on a cadillac but a friend is going through a divorce and broke and appears to ...
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
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.
Automobile(s): 58 Coupe Deville, 77 Coupe deville, 90 Deville
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.