Something for the engine buff......

[hondacuraplanet]

Going to look at an old Farmall Cub tractor today for snowplowing and general fun and came across this in a Q&A site about them:

Where is my water Pump?

The Farmall Cub, like a lot of tractors designed during this period, uses a thermosyphon cooling system.

The engine does not have a water pump, but relies on the principle that warm water rises. The hot water flows out of the motor, to the top of the radiator, where it cools and drops through the radiator back into the bottom of the engine, where it repeats the process.

This system is self-regulating, and has worked on these tractors for almost 50 years. During cold weather operation, it may be necessary to block some of the airflow through the radiator, in very cold weather the cooling system may overcool the engine, and not allow it to reach operating temperatures. The system is capable of cooling the engine adequately during summer weather.

Note: If the radiator is filled to the top, it will overflow when warm. This is normal as the system will set it's own water level. Early Cub's used a non-pressurized cooling systems. In later years the system utilized a low pressure cap, about 2.5 -3 lbs. of pressure.

.....thought this was interesting enough to share. A liquid cooled engine without a water pump

[jestmaty]

That is really cool

Now I have another bookmark to browse when I get the time. I love reading about things like this.

[hondacuraplanet]

This is the site:

http://www.antique-tractor.com/CubFAQ/cub_faq.html

And this is my new tractor!