The reason I asked the serial number for the cold running engine is that IF it is the contra-rotating engine and IF someone replaced the coolant water pump with one for the regular rotation engine, then it may overheat if a thermostat is installed....the backwards facing impeller fins may not be able to push coolant properly hence the need to remove the T stat.
I went thru this with a Chevy based gas engine several years back.
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Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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