Heat Sensors

[rjshomes]

I recently purchased a pontoon boat with a 40 hp Merc 2 cycle motor. It's a 1997, serial number OE258681. Is there any kind of sensor on this motor that will let you know that it is overheating? I noticed in a parts catalogue that there is something called a thermo switch. Would that be a part of a warning system and if it is, is there a way to see if it is operating correctly? Thanks in advance for your help.

 

[AMD Rules]

Re: Heat Sensors

You should have a thermoswitch mounted on the cylinder head cover near the upper spark plug.<br /><br />They can be tested for function by grounding the wire connector. You should have a buzzer in your controls, that will beep to indicate the high temperature alarm.<br /><br />You can also remove the thermoswitch and test it for temperature range by immersing in it hot water etc and checking for continuity points at various temperatures.

 

[KCLOST]

Re: Heat Sensors

The thermoswitch testing in hot water will work depending on the temp. it is set to give continuity.

 

[rjshomes]

Re: Heat Sensors

Thanks fellas. I sure appreciate this forum. RJ