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Author Topic:   Mercury 90-HP 4-Stroke Overheat Alarm
fno posted 01-26-2004 06:53 PM ET (US)   Profile for fno   Send Email to fno  
Has anyone else had the overheat alarm go off after running full out with no other signs of overheating. This is on a 2000 Mercury 90-HP 4-stroke. I changed the temps sensor and the impeller twice now with no change. The [cooling system confidence steam output] water doesn't seem to change much in temp either.
dgp posted 01-26-2004 07:54 PM ET (US)     Profile for dgp  Send Email to dgp     
Check the thermostat.
jimh posted 01-26-2004 08:07 PM ET (US)     Profile for jimh  Send Email to jimh     
[Administrative post]
Steve Leone posted 01-27-2004 12:43 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Be carefull. One of the main warranty problems with those puppies is that the oil pick-up tube that goes to the sump developes a crook in it and chokes the supply of oil that lubricates the engine. Also, you should have bought the injected 115. It is a way better engine and weighs the same. The carbureted 70 and 90 Mercury four strokes have had thier fair share of warranty claims.
tbyrne posted 01-27-2004 11:07 AM ET (US)     Profile for tbyrne    
fno, I have had it happen once in 60 hrs. on my Yamaha 80.

It came on; I shut down for a minute or two to check the prop and water intakes; I restarted and had no further problems that evening or since (10-15 hrs.). When it happened, I had the motor trimmed all the way out to lift the bow due to passengers forward. I suspect that I wasn't getting enough water to the intakes, but I'll probably check and change the thermostat this spring.

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