175HP EVINRUDE 1986 HOT INDICATION

flotilla

Recruit
Joined
Jul 27, 2003
Messages
2
Here's the problem. Boat was in storage for 3 yrs. On first run, got overheat horn and indicated approx. 210 degrees at idle at dock. Immediately shut down engine and replaced pump impeller and housing,(old one looked ok). Then pulled and cleaned thermostats. Looked a little crusty but cleaned up ok and felt smoothe. On next try, engine warmed up to 175 degrees at idle and leveled off. After running at cruise for approx. 5 min., I noticed the temp slowly increasing to about 190 and stablizing. I also noticed the voltmeter had slowly increased from about 13 volts to 16 volts at the same time. I shut the ignition off and back own, the volts indicated 12.5 and the temp went back to 175 degrees. Do I have a volt reg. problem? A temp. indication problem, or a overheat problem? The engine runs great, the water stream is ok, and the exhaust spits out water. Is there a water pressure indicator add on kit available? I heard they're more reliable.
 

Bill Stock

Cadet
Joined
Jul 14, 2003
Messages
26
Re: 175HP EVINRUDE 1986 HOT INDICATION

If you take thermostat out how does it run? I had bad miss when ran to hot ,changed thermostat and now runs great. Bill
 

wilde1j

Vice Admiral
Joined
Apr 15, 2002
Messages
5,964
Re: 175HP EVINRUDE 1986 HOT INDICATION

Is the motor actually running too hot (can you put your hand on the block w/o getting burned while running)? Should be running around 150 to 160° F. If the actual temp is OK, then the problem is with the gauge, although the hot horn is sensed independently. <br /><br />The high voltage isn't likely related. Check across the +/- posts on the battery w/ a VOM. Panel voltmeters are not very accurate. If it is actually getting to 16 Vdc and your motor has a rectifier/regulator, it may be bad. If your motor only has a rectifier, the output voltage is unregulated. You can turn on load elements to knock the voltage down in that case.
 

flotilla

Recruit
Joined
Jul 27, 2003
Messages
2
Re: 175HP EVINRUDE 1986 HOT INDICATION

Thanks for the suggestions...I'll give um a try
 
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