to much radiator pressure
:mad:I have an 87 300sd. the problem is as soon as the car starts it exceeds the pressure on the radiator cap, maybe 25psi. It does this almost immediately. I pressure checked the coolant system and can find no external leaks. the car has about 160k on it. It starts a little rough but runs. I was thinking head gasket. Is there any thing else it could be. Any help would be appreciated. Thanks:)
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nothing else comes to mind. try runinng the car wit the cap off, if you get air comping out of it, than you got a head gasket problem. has the car ever over heated before
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radiator pressure
My daughter drives it. She says no, but who knows. I was planning on doing a compression test next. It seems funny that I can pump the radiator pressure up and no leak down, but upon starting the radiator builds pressure immediately.
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well you test the cooling system with no more that 17psi. but the compression pressure can go over 200psi so it could be a tiny hole on the gasket or even a tiny crack on the head
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Sounds like a leaking Head Gasket or a Crack in the Combustion chamber. I cannot think of anything else that could casue your issue.
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