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Old 05-28-2009, 12:57 AM
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Bellinghamster Bellinghamster is offline
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Join Date: Apr 2008
Boat: 1978 Stars and Stripes, PCM 351 (60hrs)
Location: Northwest WA
Posts: 171
My first time out this season I heard squealing while idling away from the launch, shut down to investigate - the raw water pump was too hot to touch! It failed to prime due in part to the hose loop above waterline out of the transmission cooler, and possible because I'd drained the block and the heater hoses - I've got a "T" heater return to the suction side of the raw water pump. With the block empty it was pulling air from the block/exhaust backwards through the heater and into the intake of the water pump. I swapped impellers (for good measure), poured water into the hoses to fill them up, pinched off the heater circuit hose and fired back up - no problem. I should have run it on a garden hose first to fill everything up with water before launching...
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