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Universal 5411 overheating randomly

whitegreg56

Regular Contributor
Our sailing club has a Universal 5411 inboard diesel on a 28' O'Day sailboat.
It overheats some of the time. Just about everything has been taken apart
and checked/replaced. The temperature gauge cycles up and down and
with prolonged running it will eventually overheat. Is this likely a water-pump
problem? Should the temperature cycle up-and-down...or, should it be rock solid
like in an automobile? We're running out of ideas!!!
 
Well, it turned out that the (water-cooled) exhaust manifold was leaking exhaust gas
into the raw-water cooling system. These exhaust bubbles made it difficult for the
water pump to operate properly. Thus, the system was overheating. The exhaust
manifold was replaced and all is OK now.
 
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