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My 2510 was overheating removed thermostat but found out later it was a broken/loose fan blade corrected the problem runs good now what is the advantage of using the thermostat quicker warmup? Do I need the thermostat?
 

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A properly functioning thermostat prevents thermal shock, as well as keeping the engine temperature within the correct operating range.

If you use the Mule where you will be loading and pulling the engine hard, then allow it to run down a hill on compression in cold weather the engine can cool too rapidly when cold radiator water circulates in the warm engine. That causes thermal shock which results in rapidly contracting metal components, and just like with an airplane engine, can lead to damage.

The fuel system is also designed for a specific engine operating temperature range. Running with too cool an operating temperature leads to cylinder wall wash down - where the gasoline washes the protective oil film from the cylinder walls, and premature piston, ring, and cylinder wear.
 
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