Military-Vehicles: [MV] M37 Running Hot

[MV] M37 Running Hot

RKiser8375@aol.com
Tue, 5 Aug 1997 00:22:21 -0400 (EDT)

My M37 is running hot and getting vapor locking. I live in Denver, and the
truck runs at altitudes between 5,000 and 12,000 feet. Also, it is fairly
hot here (about 90 degrees Farenheit) and pretty dry (about 20-50% humidity).

It seemed as though the radiator was not as hot as the rest of the engine.
The engine and everything under the hood gets very hot, but the radiator
doesn't get very hot.

I tried adding a gallon of antifreeze. And it was still running hot. Then,
we removed the water-pump bypass elbow and turned the fan blade to verify
that the water pump impeller was spinning. We also adjusted the idle mixture
screw to run a little rich (turned screw clockwise) and retarded the timing
some. The last thing we did was switch the manifold valve from Winter to
Summer operation, although I don't how much this will affect the temperature.

Also, I do not have a thermostat in the engine. I don't believe that this
can make it run hot, though, can it?

Does anyone have any suggestion as to what would make the engine run hot
under these conditions?

Thanks in advance for any advice.

Rob Kiser
'52 M37

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