Thermostat assembly question

[sheboyganjohn]

I have a 1960 Johnson 40hp that I have finished a rebuild of the lower unit and decided while I was at it I would change out the thermostat and found out that all the guts are missing for the thermostat. I have found a place on line that I can order parts, but they only to back to 1968. From what I remember, the big twins were about the same from 1960 to 1972, so will those parts work in my motor?

 

[fishermanms]

Re: Thermostat assembly question

For what its worth...see if you can get up with a member here by the name FishMagnet. He ordered a thermostat for the same motor. This particular thermostat sat on top of a cork that is seated on top of a spring that allowed the thermostat to be pushed down just enough to allow more water thru when the engine reached higher temperature.... Fishermanms

 

[F_R]

Re: Thermostat assembly question

1970 was the last year that the 40hp had a thermostat....until it was redesigned later on. But yes, the thermostat and guts were the same from 1959-1970. In addition to the 'stat, it takes a black plastic housing, a white plastic relief valve button, and a special relief valve spring. The relief valve controls water recirculation back to the water pump depending on whether or not the 'stat is open.

 

[fishermanms]

Re: Thermostat assembly question

Pay attention to Commander Imported FR..... Hes a little grumpy sometimes but he knows his stuff...

 

[sheboyganjohn]

Re: Thermostat assembly question

Thank-you very much for the help. I was planning on taking the kids fishing this week with the boat (maiden voyage) I know is should have the thermostat, but would it still be o.k. to run it for the 5 or 10 minutes each way to the fishing spot? I would think it would not hurt it since it appears that it has been run with-out a thermostat for a while.