Ford 8N Tractor Cooling system

Your tractor appears to be overheating.

Here is a quick list of things to check:

Low water level in cooling system, System overfilled, Radiator clogged, Fan belt slipping, Collapsed radiator hose, Thermostat stuck, Tractor overloaded, Improperly timed ignition, Fuel mixture too lean, Weak spark, Diluted lubricating oil, Pulling heavy load at reduced engine RPM, Water pump impeller vanes broken.

Remove the radiator cap and check that the level is within about an inch of the top. Any more than that will just run out on the ground when it gets warm. With the radiator cap still off, start the engine. You should see little or no movement of the water at first. But once it begins to come up to temperature, the water should start to flow. This means your thermostat and water pump are probably working properly.

Shut the engine off then check rubber hoses and fan belt for cracks or old age. Replace if there is any question. Make absolutely sure you have a thermostat in the top radiator hose and it is pointing in the correct direction. The bi-metal spiral end that senses temperature should be installed pointing towards the engine. They usually have an arrow or legend stamped that will say "TO RADIATOR" or "THIS SIDE TO ENGINE".

Thermostat - Do not remove or decide to run your engine without a thermostat. The primary purpose of the thermostat is to make sure the engine comes up to and stays at proper operating temperature. A cool-running engine does not heat the oil sufficiently, greatly reducing it's lubricating properties, allows moisture to collect, and causes sludge build-up in the oil pan. The thermostat should start opening around 160 to 165 degrees, be fully open at 190 to 200 degrees, and then it should be fully reclosed when it cools back down to 160 degrees. You can easily check it with a thermometer in a pan of water on the stove.

Flush the system. Clean any trash out of the radiator fins and straighten any fins that are bent. Inspect the radiator and engine for signs of cracks or leaks. Check fan for loose, missing, or bent blades. Correct any problems. My first choice if you need radiator work would be to take the original to a radiator shop. Many of the replacement "MADE IN CHINA" radiators you find will not fit right.

Look for signs of antifreeze in the oil. A little moisture is probably just condensation. A leaking head gasket is not really very hard to replace. Make sure you get the good quality head gasket. Cracks in the block can sometimes be brazed or fixed with JB-Weld.

Check all hose clamps and the drain cock then refill the system with 50:50 antifreeze and water. I like to use the new environmentally friendly type of antifreeze.

If your tractor overheats, here is a list of things to check: