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Author Topic:   2004 Mercury 85-HP OptiMax Continuous Alarm
walkd posted 07-25-2010 10:13 PM ET (US)   Profile for walkd   Send Email to walkd  
I have a 2004 Mercury 85-HP OptiMax. It has been running fine, but today, on the way in from a day on the water, the alarm went off and stayed on. It was the heat alarm based on the owner's manual. I slowly limped in to the landing. If I tried to accelerate it would slow down. Not sure what would cause it to overheat. I checked the oil, which was down but not severely low. I did fill it just to be sure. I fear the engine may be damage based on it slowing down and losing power. Is that a valid concern?
jimh posted 07-25-2010 11:03 PM ET (US)     Profile for jimh  Send Email to jimh     
It is typical that when the alarm system detects an over-heating condition in the motor, the engine control system will take over and limit the engine speed to about 1,500 to 2,000-RPM.

Over-heating is typically caused by insufficient cooling. Unless there is a malfunction in the temperature sensor, in the alarm system, or in the engine control system, your engine temperature was probably too high and the alarm was valid.

For help in making repairs to the cooling system, you can re-post to the REPAIRS/MODS discussion

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