The raw water pump on my A4 is what I believe to be a Sherwood "30G" -- 6 bolt pattern with the words "Sherwood Detroit" stamped on the brass.
I got the A4 running (its on the hard still), but now the water pump does not seem to have suction. The pump is belt driven off the crank pulley (spins great, new belt) and I have changed the impeller, and ensured the keyway is correctly installed, etc. I should note that the pump was excellent all last year.
I have tried putting the intake hose in a bucket AND have set up a toilet plunger hose contraption on the through hull outside -- but no matter which method I use, the pump does not want to pump water and the engine quickly overheats.
I dont think there is a clog anywhere, because at one point yesterday when I had her running she WAS pumped correctly (I cannot remember if this was before I changed the impeller or not, but the new impeller is the exact same brand).
My guess: the pump is sucking some air --- I used the flimsy paper gasket on the back of the water pump, but maybe I should use some gasket sealant as the surfaces may not be perfectly sealed?
OR -- does the pump need to be "primed"?
Thanks all
I got the A4 running (its on the hard still), but now the water pump does not seem to have suction. The pump is belt driven off the crank pulley (spins great, new belt) and I have changed the impeller, and ensured the keyway is correctly installed, etc. I should note that the pump was excellent all last year.
I have tried putting the intake hose in a bucket AND have set up a toilet plunger hose contraption on the through hull outside -- but no matter which method I use, the pump does not want to pump water and the engine quickly overheats.
I dont think there is a clog anywhere, because at one point yesterday when I had her running she WAS pumped correctly (I cannot remember if this was before I changed the impeller or not, but the new impeller is the exact same brand).
My guess: the pump is sucking some air --- I used the flimsy paper gasket on the back of the water pump, but maybe I should use some gasket sealant as the surfaces may not be perfectly sealed?
OR -- does the pump need to be "primed"?
Thanks all
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