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Counter-rotating engine overheating.?
I am stumped.This is a 350 inboard.The engine is rebuilt and was boiled out to make sure it was clean.Both manifolds and elbows and thermostat housing have also been cleaned.Has a new circulating pump and complete new sea-water pump.The transmission cooler is also clean.The complete fresh-water system has been cleaned or replaced but it still heats up.Has anyone ever came across this problem?I don't know what to try next.Any suggestions.
2 Answers
- 45 autoLv 71 decade agoFavorite Answer
Check the exhaust hoses as if overheated the burn a hose in the tube and then when the water from the exhaust enters it blows up the tube make back pressure. also the muffler if it has a i way valve the come lose and block the exhaust causing over heating. If closed system there could be air in the circulation pump as it spinning backwards bleed the air from the highest point. put a expansion tank with a 7 lb return cap.Risers the water discharge holes plugged or closed to small.There are a lot of different ideas that need to be checked,
- 1 decade ago
di you hook all your hose back in the exact same way as before being rebuilt?
are you sure your hoses to the raw water pump is hooked up correctly not backward?
heats up need more details?
ex. after 1 minute or under load etc?
can be many things.start at the raw pump and work from there.
Source(s): i own a few boats
