john deere 40 T

bwl · May 3, 2014

I am rebuilding a jd 40 t got it running but it heats up at the top of radiator the bottom is ok gets so hot that the oil where the lifters are smokes everything is open except i think the radiator maybe bad it"s original could it b this it"s a siphon type no clue thanks

M-MAN · May 3, 2014

Yes, it's a thermo siphon system. Did you pre mix the antifreeze? If not get it out of there, mix it and put it back. Leave a few inches of airspace at the top of the radiator. Make sure your timing is showing SPARK in the flywheel window at full throttle. Check the temperature with a thermometer in the top of the radiator.

bwl · May 3, 2014

M-Man thanks but why does the top get so hot and the bottom cool and the oil top where the lifters smokes also should i speed it up and put a timing light on not a mechanic to much a retired master plumber pet project neede a little more instruction thanks

Half · May 3, 2014

I bought one and it got hot about like that. The fan belt was loose. Tightened it up and has been fine since. Just an idea.

bill mart · May 3, 2014

smoke from the oil fill on the valve cover could be blow-by. bill

Gene Dotson · May 3, 2014

A thermo siphon system works much better on plain water. Glycol raises the boiling point so does not boil at the lower temperature to keep the coolant moving. A thermo siphon system works by boiling the water in the head to force it through the radiator, just like a coffee percolator does. Years ago we used a wood alcohol anti-freeze. The name of it was Zerone. Don't know if it is still available, but have heard of RV anti-freeze being used. Alcohol boils at a lower temperature than water.

Gene

buickanddeere · May 3, 2014

The rad is supposed to be receiving bubbling coolant through the top hose. The lower rad and lower hose should be barely warm.
It's only the difference in thermal density that circulates the coolant.

James Howell · May 4, 2014

You might consider taking a look inside the manifold outlet.

Notice the small bar inside.

Check to see if there is a "thermostat" inside the manifold outlet hose.

This "thermostat" will bring your temperature up very fast.

As suggested check the water temperature with a kitchen thermometer.

The operating range may vary from 170<sup>o</sup> to 210<sup>o</sup> depending on season and/or geographical location.

Hope this helps.

Leroy · May 4, 2014

air pocket will do that as well as pluged radiator.

john deere 40 T

bwl

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M-MAN

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