Yanmar YM240D OVERHEATING

   / Yanmar YM240D OVERHEATING #21  
Normally when you experience consistent overheating problems (and particularly when you know that the engine was neglected - no Antifreeze/coolant) then you can be almost certain that the radistor core is blocked(i.e. inside). The antifreeze/coolant additive also inhibits rust. If the system starts rusting the gunge collects in the radiator core and blocks it. You may still see the water circulating because the core may not be 100% blocked. If it is 60% blocked it means 60% less cooling capacity.

Leaking coolant will obviously also cause overheating. The less coolant in the engine the higher the temp until is exceeds a critical point where the heat generation overcomes the cooling capacity. This can happen very quickly. In your scenario it does not seem to me that the coolant is leaking out that quickly hence the suggestion that you have the radiator checked and recored if necessary.

You must get the crack fixed permanently though or you will always have problems. The when the coolant is pressurised the boiling point is increased. If there is a crack it will not come up to the presure the system was designed for and will be more prone to boiling and overheating.

Good Luck in solving your problem.
 

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