Mercury 150 overheat Alarm

[Reel Bender]

Are ya sure it is an overheat alarm.

A neighbor has had similar problem 2 times in the last year and called me to rescue him. It turned out to be low oil alarm. The merc has 2 oil tanks and the one in the motor ran out of oil. They just checked the external tank.

The alarm on it was a continuous beep also.

If it is overheat it won't let the RPMs go above around 1200.

Worth a check anywho's.

[Ray]

Originally Posted by Reel Bender

Are ya sure it is an overheat alarm.

A neighbor has had similar problem 2 times in the last year and called me to rescue him. It turned out to be low oil alarm. The merc has 2 oil tanks and the one in the motor ran out of oil. They just checked the external tank.

The alarm on it was a continuous beep also.

If it is overheat it won't let the RPMs go above around 1200.

Worth a check anywho's.

I figgered out how the Mercury oil injection system works, 35 miles offshore. If the cap on your big tank isn't screwed on tight, it will set off the alarm.
My Merc. 200 used engine case pressure to pressure up the big tank to push the oil into the small tank, which has the float switch in it.
I didn't have the big tank lid screwed on tight enuff.