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yanmar 6ly72_stp coolant losss

tthomas

New member
my 450 hp yanmar looses coolant into the overflow tank but does not draw coolant back in to the system when the engine is cooling. it consumes about 1 qt of dexcool per3 hrs run time. i removed the heat exchanger and replaced the gaskets and had it pressure tested . i have no coolant in bilge. the engine runs at 160 f. the low coolant light goes on after 2-3 hrs running . i replaced the thermostat and gasket. same problem continues. ideas please
 
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