My Yanmar Tractor Is Overheating...... What Do I Do?
Difficulty - Easy
Time Required -10 Minutes
Special Tools -None.
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1 - Select your Yanmar model on the left side list
2 - Then on Cooling
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A Yanmar tractor is just like any other piece of equipment- It can overheat. There are only a few things that can cause a tractor this simple to get hot. A little investigation can save you a lot of time and money.
If you have a YM135, YM155, YM1100, YM1300, YM1500, YM1600, or YM1700 be sure that you are using NO MORE than a % 25% antifreeze mixture. These models use a very effective ThermoSiphon system and do not have a water pump. They use the natural tendency of hot water to rise to circulate the water. Too much antifreeze will not circulate correctly. It sounds funny but Please Believe Us.... We get dozens of these calls per day! Dilute your mixture to 25% or less if your tractor does not have a water pump.
Is the tractor really getting hot? The light is probably coming on but that may not mean that it is really getting hot. Temperature switches (the thing that turns the warning light on and off) do get weak. When they get weak they come on too soon. A $5 thermometer can be purchased at any automotive store. Placed into the water in the overflow bottle will tell you the temperature of the water and rule out any electrical problems. The light should come on around 220 degrees. If the thermometer shows around that temperature you will need to move to step 2. Otherwise you may need to replace your switch or look for other possible causes.
It is NORMAL for water to flow out of the radiator into the plastic bottle on the side. This does not necessarily mean that it is overheating. It does this because the water is heating up and expanding - it needs somewhere to go. Once the tractor cools, the water should be pulled back into the engine automatically. If the water is boiling out of the overflow bottle it is probably too hot or you have other issues.
Be sure that the radiator is clean on the inside (flushed out) and the outside (fins are all open and clean).
Your tractor has 30 years worth of buildup in the radiator and it is likely causing a coolant restriction. It may not be possible to flush the radiator if the buildup is severe enough. You may need to replace it.
3rd- Be sure that your belts are tight and your hoses are soft and pliable. if a hose is dry and cracked it could be separated on the inside causing a blockage. If the hose is too soft it may be collapsing causing a blockage. Both will cause the tractor to get hot.
If you are unsure about any of these steps- please ask a qualified mechanic for help!
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