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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: 190
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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Old 06-01-2009, 02:53 AM
tchipman tchipman is offline
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Join Date: May 2009
Boat: 1992 prostar 190
Location: west coast
Posts: 6
sounds like impellor or clogged oil cooling line?
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Old 06-01-2009, 04:44 AM
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gwpowell gwpowell is offline
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Join Date: Mar 2008
Boat: 2008 X7
Location: Australia
Posts: 147
We had a similar problem but it turned out to be the fresh water flush kit which was fitted to the intake side of the water pump. The hose was rubbing on the alternator pully which wore a hole in it.
It was difficult to spot because when the engine hatch was open the hose was not against the pully, it was only after we closed the engine hatch that the hatch itself pushed the hose against the pully.

At speed we were OK because the flow of water into the pickup had enough force to push itself through, but at idle the impeller was sucking air from the hole in the hose so we overheated.
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engine, impeller, overheat, temperature, wakeboarding

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