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crack block or head gasket

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garry17

New member
1990 OMC 3.0 4cyl gm. Did not winterize and have multiple water leaks at bottom of exhaust manifold, gasket head & engine block . Has anyone had a head gasket blown out from freezing? Freeze plugs did not go out.Runs fine so no water internal. Really don't want to take it apart right now. Installed auto flip switch for the bilge.
 
Head gaskets don't usually get affected by freezing.The head and manifold and block usually crack and leak into the block.
Your lucky it's not leaking into the oil.The manifold/riser canleak back thru the valves.
Keep an eye on it while you run.Check the oil and if the level raises or it changes color :(
The plugs on the side aren't really freeze plugs.They are casting holes.Sometimes they will come out when the temp goes too low.
 
the 3.0 block likes to crack just below the head port side when not winterized. It's probably not leaking from the gasket, it's probably leaking from a crack in the cast iron just below the gasket.
 
Thanks guys for your thoughts on this. I will be doing something after the summer season is over then will address my problem.
 
Listen keep the bilge pump going and run it till the end of the summer.

You need a fresh water used motor After 87' Don't matter what make.
 
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