4.3 MerCruiser overheating

Liberty08

Cadet
Joined
Jun 7, 2020
Messages
7
I wrote in the forum previously about my boat intermittently having the alarm come on went to take the boat out the other day had it warming up at my house with my water hose and ears boat started To overheat Decided to change the thermostat just recently put on a new impeller still was overheating flushed all of the lines including the hose in the gimbal housing all looked great. Risers and manifolds were replaced within the last year not sure what else it could be didn’t see any water leaking from my water pump have not changed that. Check the oil no milky Oil never had a temperature over 200 that I saw. Serial number on the engine is 1A300440 any suggestions?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,308
just recently put on a new impeller still was overheating

Ayuh,....... Welcome Aboard,....... Did ya do just the impeller, or the raw water pump Kit,..??

It takes very little scorin'/ polishin' of the ssteel cup, 'n plate, so the impeller don't pump,....
 
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