2000 Evinrude 150 overheat alarm

firemarshal8

Recruit
Joined
Aug 13, 2010
Messages
4
Posting for a friend; 2000 Wellcraft 210 Fisherman w/150 Evinrude

When you go on full plane the overheat alarm goes off with the temperature gauge reflecting normal operating temperature. My suggestion was that the intake was cavitating based on how high the boat comes up out of the water. I suggested to have someone look back at the motor while on plane to confirm pee hole water and see what the lower unit looks like in the water. He just bought the boat and the previous owner took him out in it before the deal and explained to him that it has done it since day one of his ownership and about 25 outings. Any suggestions or am I on track with my theory.
 

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 2000 Evinrude 150 overheat alarm

Possible, but the temperature gauge is usually only reading one bank of cylinders, so that's not a totally reliable indicator. You also have the possibility of a fuel obstruction alarm which gives the same constant alarm as an overheat.
 
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