MF65 Over Heating

When you painted that raditor hope you dident paint core? leave code bare or paint with heat transfer paint.One way to check rad. for clog is drain rad. look at top of core if you see twenty tubes and ten are blocked consider rad. flow half blocked. Some rads.have shield so this will not work..

In field operation, our 35's would pull more. We even resorted to hooking up a lawn sprinkler to spray on the rad and oil pan while running an irrigation pump.

Checked water pump for water flowing fast in the top of the rad when hot, replaced thermostat twice, removed water pump to check impellor clearance, replaces all hoses in case one was partly blocked, .... 5 years, including a couple of calls to Big Dean....

Finally removed the rad and had it rodded out at a rad shop. Turned out that repeated topping up - sometimes with less than clean water - had left gucky deposits that partially plugged the vertical tubes in the rad.

No more problem.

Let's go Mountaineers,

Aaron

You also may not have any blades left on the water pump impeller. Not sure how to check this.

BTW, when replacing gaskets in the cooling system, be sure to put a thin coat of sealant on both sides of the gasket. I wish I had.

Also, the thermostat seats in the housing, not the block on the gassers. Put a thin layer of sealant on the lip of the housing, install thermostat in the housing, then wait til it firms up before trying to bolt the housing to the head. I have ruined two gaskets before figuring this one out. I kept getting the thermostat in between the sealing surfaces.
HTH

Let's go Mountaineers,

Aaron

There may be no defects at all...

When the engine is cold the thermostat is closed
and no circulation can be seen through the filling neck.

There is no coolant recuperation bottle on these old tractors so if you fill radiator to the cap when the engine warms up the coolant will expand and throw the surplus by the overflow tube. So after the engine reach normal temperature the overflow will stop leaking.

if you stop the engine and wait cool down you will see that coolant is lower...do"nt refill because
it will throw the surplus again in warm up.

The normal (cold engine) coolant level in radiator is 3 to 4 inches below the filling neck. When engine is at normal temperature coolant will be just at the filling neck.

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That said...does the engine temperature gauge indicates overheat ? if yes..the thermostat may be stuck closed or installed backwards...is the fan belt tight if it slips the water pump does"nt turn fast enough.

Warning ! Do not remove the radiator cap when engine is hot coolant under pressure will get out and burn your hands and arms. You may remove it by turning very slowly whith an insulated glove.

My 2�

Joe Ferguson

I have heard that they will run better with a 180* unit, but was to afraid to try. The 160* was apparently used to prevent overheating alcohol style antifreezes. Ethylene based antifreezes do not need this.

HTH

Let's go Mountaineers,

Aaron