Posted by Andy Martin on November 23, 2009 at 14:51:00 from (199.197.2.151):
In Reply to: water pump location posted by matthew scheirer on November 23, 2009 at 06:47:55:
I'll add my explanation although the others were right, it is a little hard to understand.
The cool water in the radiator is heavier than the hot water in the engine. It is this difference in weight that causes the cool water to try to settle to the bottom and in the process flows in the pipe to the engine. This pushes hot water up and it floods the top of the radiator and fills the space left by the sinking cool water.
They are a great system, you don't need a thermostat because the water does not leave the engine until it gets warm. It is self regulating.
You may get a little boil over after a hard pull but it is nothing to be alarmed at.
You may have noticed the tractor does not have a fuel pump either, but it's predecessors in the 1930's did.
The letter series Farmalls (and other late thirties tractors) were designed by engineers with the same education as those who designed the B-17, P-51, Cord, Deusenburg, Cadillac V-16, etc. They look old and crude but are very well built.
The carburetor on the H and M, (and I think the A and B) have no mechanical accelerator pump. There is an air circuit that sends small bubbles into the main fuel jet, which is a tube. When you snap the throttle open the pressure around this tube suddenly drops and the air bubbles explode and force more fuel into the engine. The engines are very responsive to rapid load changes for this reason but have no accelerator pump leather to wear out or linkage to break.
Distillate tractors have hard valve seats (distillate was unleaded) so you never worry about running unleaded gas in them.
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