Beware of overheating!

This is the article translated from NOUKINAVI blog.
You can find the original post (in Japanese) here: オーバーヒートにご注意を!! | ブログ|ノウキナビ (

The hot days are still continuing.

Recently, we have been receiving more and more requests for repair of overheating of tractors and other farm equipment. In this article, I would like to write about overheating repairs.

This is an Iseki tractor, TU220F.

First, drain the coolant.

It is quite dirty. The coolant water contains preservatives and rust inhibitors, but they lose their effectiveness as time goes by. So it is recommended to change the coolant every two years or so.

Next, clean the inside of the radiator and engine with tap water.

Keep running the water until no more dirty water comes out as shown in the picture. If necessary, dismantle the engine and other parts of the car while flushing.

If you continue to use the coolant for a long time without changing it, debris will accumulate in the engine and radiator, and the coolant will not flow properly, resulting in overheating.

After that, fill the radiator with new coolant and bleed the air out of the radiator. To bleed air from the coolant, fill the radiator and reserve tank with coolant and allow it to warm up completely at idle.

Then wait until it cools down completely and refill it with the specified amount. Repeat this process until the amount of coolant does not change. If air venting is not done properly, this will damage the water pump and cause it to overheat further.

Lastly, I would like to write a little about coolant.

Coolant is necessary for the radiators of cars and motorcycles. It is an essential consumable for water-cooled engines. If the coolant is low or deteriorates, it can cause overheating, so daily inspection and maintenance is important.

LLC (Long Life Coolant)

The one in the photo can be used as is, but undiluted coolant is also available. If you want to use undiluted coolant, you need to dilute it with water. The standard dilution ratio is 1:1.

However, as mentioned earlier, coolant contains rust inhibitors and preservatives, so if you use only water, the inside of the engine will rust, so be sure to add coolant.

Coolant is also used as antifreeze. If you use only water, it will freeze in the winter and damage the engine. If you have no choice but to use water for emergency purposes, add coolant after you are done using it.

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