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1991 740T Cooling trouble 700 1991

posted by  Rule 308 on  Tue May 18 05:13 CST 2004
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last visit: Tue May 8 09:20 CST 2012
[RELATED]

Sounds like a leaking head gasket. You should start by pressure testing it and seeing if the coolant is leaking externally somewhere. If not then pull the spark plugs out and see if it is getting into the cylinders. You obvioulsy cannot see a great deal into the combustion chamber area through the plug holes, especially on a turbo, but sometimes you get lucky and can see signs of the coolant on the piston face. If none of this tells you where it is going I suggest you have a block check performed on it. It will detect the presence of exhaust gas in the coolant which is your indicator of a leaking head gasket or cracked head. Although I am sure that you could crack one of those heads I have never seen one cracked in all the years I have been working on them. I have seen them bent/warped to hell from being overheated though.






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