Posted by pete 23 on October 06, 2009 at 10:01:50 from (173.87.8.73):
In Reply to: Thermostat for an M posted by Slappy on October 06, 2009 at 06:15:58:
This subject has been discussed several times on these forums. If you will trace the water flow through the thermstat housing , to water pump, to radiator etc you will see that by installing a automotive type (less costly) thermostat it will indeed "work". Problem is that it blocks all flow through the bypass system there fore no circulation will take place in engine until thermostat opens. This is not good as hot spots will develop internally. IH made an error back in the late 70's or early 80's, substituting incorrect thermostat, quickly discovered their mistake and had a recall of those thermostats and advised any that were installed to be replaced with proper ones. Often times the type supplied by CaseIH will not give desired results. This is not fault of the thermostat, rather the fit of it in the upper housing allowing coolant to just flow right on by to radiator. These housing rust out badly over the years. I have had a machine shop install a seal in some housings but on others there is not enough material to allow this. For them I put a loose fitting O-ring on thermostat along with a thin flat washer and a light spring below it to hold o-ring up against upper housing cutting off this flow and it has been working out quite well. The housing on my own M was so bad I had to locate a different one to make it seal the way I wanted it to.
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