I have a 1978 Mercury m500 Serial: 4966982 that I just bought. I wanted to check to see if it was cooling and spitting. I started it in a big cooler full of water but no water came out. I made sure that the screens were sumerged in water but still nothing. Did I do something wrong. Is there some trick to test these motors. I scared that it won't cool and I'll reck the motor.

Any help with be great..

Thanks in advance.

Crush

That would not be deep enough in water, water should be about 4 or 5 inches above cavitation plate. The water pump has to be submerged in water to prime.

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