Thermostat

[TOMRR]

I am running a 160 Thermostat in my HP 440 for the motor breaking period. Before I drive I will install a 180 Thermostat and was wondering if it is worth drilling a 1/16 hole in the outer rim.
I was told this helps with bleeding air out of the system
Any body do this ???

Thanks Tom C.

 

[Basketcase]

I've heard this, and I've never done it and never had any trouble.

 

[quikbird]

I did it to mine but don't know that it has made any difference.

 

[Ranger]

I've heard this, and I've never done it and never had any trouble.

Ditto.

I doubt it's necessary. The system will bleed itself over the coarse of a few heat/cool cycles.

 

[69hemibeep]

I have done it both ways. They do make this thing called a cap so you can check the level but make sure its not hot

 

[Basketcase]

I have done it both ways.:

so....the rumors are true then......:basketcase:

 

[69hemibeep]

so....the rumors are true then......:basketcase:

You should try it :groucho:

 

[Basketcase]

naw.....I'll stick with what has worked...nice recovery

 

[Coyote]

I've done it for years. On initial fill, with the thermostat closed there can be an air blockage creating a hot spot. With cast iron not so much of a problem, with aluminum heads it CAN be a serious issue.

 

[Big John]

Interestingly enough, I just changed the thermostat on my 70 300 the other night.

I put the gasket, then thermostat, then housing on as usual. I thought about the debate with the hole (I didn't bother) and reached down through the housing and felt how loose the thermostat is.... and it's loose enough that IMHO, drilling a hole is redundant.

I've never drilled one and I just proved to myself that I won't bother in the future either.