Re: Farmall H cooling problem

Posted by lowercase dick on October 11, 2002 at 20:21:32 from (209.244.79.181):

In Reply to: Farmall H cooling problem posted by Rod on October 11, 2002 at 05:09:02:

I don't have an H, but I do have a 300U, and I learned a bit more about the way its thermostat is set up than I really wanted to know a while back. I'm going to assume the H is similar, and let someone who knows different shoot me down if I'm wrong. Sorry for the long post which follows.

The original (and CaseIH replacement) thermostat for the 300U is a more complicated (and expensive) item than the automotive one you're trying to use. In typical automotive system the recycle loop through the engine is always open, and the thermostat only controls flow to the radiator. The 300U (and I expect the H) was originally set up so that the thermostat could completely shut off the recycle loop when the engine was hot enough to require cooling by the radiator, and conversely, so that flow to the radiator was shut off completely when the engine was stone cold.

If I put a typical automotive thermostat in my 300U, I end up with the water pump deadheaded until enough heat reaches the thermostat (mainly by conduction through the block since no water is circulating) to open crack it open. At that point, I start to get flow through the recycle loop and then to the radiator as the thermostat opens up further. I expect the H is the same.

It sounds to me as though your system is so clean and efficient at cooling that you aren't able to get away with using the cheap thermostat. First thing I'd try is running once with no thermostat at all and see if the temperature cycling stops. If it doesn't, you've really got a gremlin loose in there somewhere.

If it does stop cycling, and you want the engine to work properly, I'd suggest either spending the $20 for the CaseIH thermostat, or try drilling a "small" hole (3/16" maybe??) in the valve of your automotive thermostat so that it doesn't shut off the recycle flow through the engine completely. This should then allow the thermostat to monitor the engine temperature accurately, and work much better (assuming you get the hole size correct).

Hope this helps rather than confuses. Good luck.

Follow Ups:

• Re: Re: Farmall H cooling problem Leroy 19:20:50 10/13/02 (0)

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