1963 40hp thermostat, housing, & pressure control valve

[baytonemus]

While going through the 40352D that recently acquired, I thought I'd take a look at the thermostat. Guess what - no thermostat! So I figured I'd just take the one out of 40302D parts motor. You guessed it, no stat in that one either.

Were there some cooling system issues with these motors that caused people to run them without thermostats? I'm aware that this is not a good idea and intend to put one in, but what should I be watching out for?

Also, the thermostat housing and pressure control valve seem to be in perfectly good shape, but I thought it might be a good idea to replace the spring and the housing gasket.

Thanks.

 

[oldcatamount]

Re: 1963 40hp thermostat, housing, & pressure control valve

Seems odd that both motors are without thermostats. They are certainly neccessary or they wouldn't have put them in in the first place. Since they don't cost to much I'd put in a new one, but, you can test the old one in a pan of hot water and see if it works. Haven't heard of any thermostat issues that would cause someone to totally remove one.

 

[Daviet]

Re: 1963 40hp thermostat, housing, & pressure control valve

Back in the day it seamed that the first thing you did was to remove the thermostat to troubleshoot an overheating problem. The thermostat was rarely the problem, but they were never reinstalled.

 

[F_R]

Re: 1963 40hp thermostat, housing, & pressure control valve

There is a crowd that just can't stand the thought of a thermostat, and blame it for every problem the motor ever had or will have. So they toss it. I wonder if they toss the one from their $30,000 car too?

As for the Evinrude 40, that plasitc housing and check valve prevent exhaust gasses from going down the second water tube leading to the pump. The same guy that can't stand the thermostat also can't stand that housing so he usually tosses it too. Then the pump sucks air (exhaust) and doesn't work right. So he finally gives up and writes to an outboard forum wanting somebody to diagnose his problem.

In short, don't be re-engineering it.

 

[baytonemus]

Re: 1963 40hp thermostat, housing, & pressure control valve

In short, don't be re-engineering it.

I never said anything about running without these parts and don't intend to. Just wondering if preventatively replacing the PCV spring and housing gasket at the same time as the thermostat is necessary or at least a good idea.

Thanks.

 

[F_R]

Re: 1963 40hp thermostat, housing, & pressure control valve

I never said anything about running without these parts and don't intend to. Just wondering if preventatively replacing the PCV spring and housing gasket at the same time as the thermostat is necessary or at least a good idea.

Thanks.

And I never said that you were planning to run without the thermostat. I was commenting on the question you posed as to what would cause people to remove them.

As for the spring and check valve, as long as they are not broken or melted, no need to replace them. The seal below the plastic housing---well maybe if it is in poor condition.

 

[baytonemus]

Re: 1963 40hp thermostat, housing, & pressure control valve

OK, thanks!