Engine water temp.too high?

[Don Schmidt]

I have a '92 200 Hp. Mercury outboard that the water temp. gage indicates above mid-range temp (if it were a gas gage,it would be the 3/4 full mark)occassionally. The water pump was replaced last season as an attempt to fix this problem?? Is this really a near overheating problem,or an incorrect gage calibration?<br />The temp. settles back down to "normal" if I run for a few minutes at "cruising" speed (more water flow). Thanks

 

[Fouled Plug]

Re: Engine water temp.too high?

If you have the Quicksilver gauge, they calibrated marks on the face don't necessarily mean you're overheating. The hacks correspond to certain temperatures. A Merc dealer should be able to tell you what each mark means in degrees so you know where the gauge should read. I take it no overheat alarms are going off, and you have a good stream from the tell-tale?

 

[clanton]

Re: Engine water temp.too high?

It always runs hotter at idle and low rpms.

 

[ODDD1]

Re: Engine water temp.too high?

DON, these motors usually run between the 1/2 and the 3/4 marks at rpms under 2000....on plane will usually run at the 1/4 mark....

 

[Don Schmidt]

Re: Engine water temp.too high?

Thanks for the info.on engine charging speed and cooling.<br />No overheat alarms have ever gone off,and I always have a "fair" tell tale stream and good water pressure. It is always under 2000 rpm when the gage creeps to the 3/4 mark. I will ask a Merc dealer what gage marks are in degrees.<br /> Thanks again

 

[Fouled Plug]

Re: Engine water temp.too high?

I checked out a Quicksilver gauge at the local Merc shop. Lowest peg=100 degrees. Highest=240. 3/4 would be around 170 to 180.<br />Did the thermostat get replaced at the same time as the impeller?