Once the tractor cools, the water should be pulled back into the engine automatically. It does this because the water is heating up and expanding - it needs somewhere to go. This does not necessarily mean that it is overheating. It is NORMAL for water to flow out of the radiator into the plastic bottle on the side. Otherwise you may need to replace your switch or look for other possible causes. If the thermometer shows around that temperature you will need to move to step 2. The light should come on around 220 degrees. Placed into the water in the overflow bottle will tell you the temperature of the water and rule out any electrical problems. A $5 thermometer can be purchased at any automotive store. When they get weak they come on too soon. Temperature switches (the thing that turns the warning light on and off) do get weak. Is the tractor really getting hot? The light is probably coming on but that may not mean that it is really getting hot. If you see continuous bubbles in the radiator when the tractor is running then you probably have a blown head gasket.
#Yanmar 2gm cooling system how to
How to test- Let your tractor cool down completely.
A lot of "overheating" calls are actually "blown head gasket" calls. Don't forget to add more antifreeze in the winter to avoid freezing.Īre you SURE it is overheating? If all of your water is "boiling" out of the radiator it could be a blown head gasket! Before you assume that it is overheating - check the water temp with a thermometer or mechanical temp gauge to be sure it is really too hot. We get at least 2 or 3 of these calls per day! Dilute your mixture to 25% or less in the summer if your tractor does not have a water pump. Too much antifreeze will not circulate correctly and does not conduct heat as efficiently. They use the natural tendency of hot water to rise to circulate the water. These models use a very effective ThermoSiphon system and do not have a water pump. I expect you could also pull the thermostat and put it back in after the flushes.If you have a YM135, YM155, YM165, YM1100, YM1300, YM1500, YM1600, or YM1700 be sure that you are using NO MORE than a % 25% antifreeze mixture in the summer (add more in the winter). The 2GM20F system with water heater loop takes slightly more than a gallon of antifreeze. Make sure you take that off and clean it out as well.īy the time you've done the flush & rinses, you will be an old hand at burping the air out.
There is an expansion tank on the antifreeze side of the system adjacent to the 'radiator cap' coolant fill riser in the sail locker. Don't bleed it after the system is already hot and under pressure. I solved the problem by bleeding the air out of the system, by loosening the hose clamp on the upper hose from the front of the engine to the water heater. However, I did a complete flush & 3 rinse outs of the 'green stuff' from the Yanmar before changing the antifreeze type.įor a 2GM20F, you may need to 'burp' the air out of the top of the engine as an air bubble can form under the thermostat and your overheat alarm will sound because the T-stat will not open. We have had one of those $800+ repairs due to DexCool attacking intake manifold gaskets in our Pontiac so I used Yanmar's pre-mixed product instead of DexCool. We have the 2GM20F Yanmar in a 28.5 and changed to Yanmar's own orange antifreeze several years ago.
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