When I re-powered my Islander 28 last summer I added a few things. There was no strainer for the raw water intake, there was no AS valve and I added a heat exchanger. When I installed the loop from the strainer to the inlet on the raw water pump I ran it up beside the starboard cockpit wall and put the AS valve at the top of that loop. The loop rises well above the top of the heat exchanger that is being fed by the raw water pump. I am wondering why I have to tape over the opening in the AS valve to allow the raw water pump to start its pickup of raw water. The opening of the AS valve does "suck" air when the pump is opereating. The piece of tape I use to get things started is dimpled in. You can feel the suction with your finger. Is there something wrong with the valve? Apparently it leaks (sucks) so much air it allows the pump to cavitate and not draw water. Is my loop too high?
I have un-mounted the inlet loop so I can pull it down and add a piece of tape when I start the engine. I must be doing something wrong. I guess the loop with the AS valve should be in the hose leaving the heat exchanger for the exhaust? That would remove the pump from the equation.
Thanks,
George
I have un-mounted the inlet loop so I can pull it down and add a piece of tape when I start the engine. I must be doing something wrong. I guess the loop with the AS valve should be in the hose leaving the heat exchanger for the exhaust? That would remove the pump from the equation.
Thanks,
George
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