1962 Evinrude 40hp (Please Help)

[ryan1790]

Hi I have two questions about a 1962 Evinrude 40hp. I went to check the thermostat and it was missing. Should there be one? And what would be the affects on performance without one?<br />My second problem is there is a single wire that comes out of the back of the motor right next to the lower spark plug, It is busted off and I was wondering what that is for and what it should connect to. If anyone knows please help. Thank You

 

[OBJ]

Re: 1962 Evinrude 40hp (Please Help)

Yep....there should be one. Running a cold engine means poor idle and the combustion is not great....black spark plugs and stuff like that. And always a chance to cold sieze the engine.<br /><br />Put a new stat in it.

 

[AMD Rules]

Re: 1962 Evinrude 40hp (Please Help)

As for the single wire....<br /><br />I have a different model year 40 Evinrude, but the principle of operation should be the same. <br /> <br />Typically the temperature switch is connected to the tan harness wire. The other lead is connected to ground. I would be curious though, as to why the wire is broken/disconnected. The switch may have been faulty? <br /> <br />You can check the switch by immersing it in hot water, and checking for continuity between the wires. The switch simply completes the circuit above 210°F. The circuit should open again when it cools below 175°F. <br /> <br />The temperature switch tan wire is normally connected to a warning light in the dash console (or buzzer) to indicate an overheat condition. <br /> <br />Hope this helps.

 

[cajun555]

Re: 1962 Evinrude 40hp (Please Help)

I've got a 63 40hp, it has the hot water choke on carb. If yours has that setup I would assume that choke wouldn't function properly without a t-stat in the automatic setting on choke lever.

 

[Chris1956]

Re: 1962 Evinrude 40hp (Please Help)

Cajun and Ryan, I also had a hot water choke on my 40HP. It rusted up and was useless 30 years ago. Check to make sure yours are still working. If not, there is a manual choke setting that always worked well.

 

[Saskatoon2005]

Re: 1962 Evinrude 40hp (Please Help)

I have a 1961 Johnson 40 H.P.. Model RDS-23. I too have the hot water choke idea as well, but I haven't used it. I too have a broken wire at the back of the power head. I believe it is the temperature switch and that it was diconeccted due to not working any more. I have not checked mine out but it sounds the same as yours. One wire is attached to ground and the other wire has been cut.