I did the raw water pump reorientation described by Joker460, to enhance the ability to get at the impeller for assessment/replacement.
http://forums.sbo.sailboatowners.com/showthread.php?t=148014
and added speed-seal life, and replaced the existing belt with a 3L180 belt. It's actually good that I replaced the belt, because examination revealed to tears in the previous belt.
I replaced the old tubing going from the raw water filter to the pump, and from the pump outflow to the heat exchanger, with 3/4" ID Shieldsflex, because I needed longer length hose> I re-routed the hose from the pump outflow to the heat exchanger, so it's now in front of, and not behind the V belts. I replaced the impeller and gasket, when I installed the Spead Seal life.
After connecting the new host to the pump intake and exhaust, and before tightening up the belts, I tried to manually rotate the pump, clockwise, hoping to prime it.
After starting up the engine there was only a dribble of fluid out the exhaust. I shut the engine off after 5 to 10 minutes, not wanting to overheat anything. The pump specs are
Johnson Pump F4B-903, 10-24509-01. Impeller Johnson 810B-1
Questions.
How long after starting the engine, should I see water coming out the exhaust.?
Could there be air in the hose between the raw water strainger and the raw water pump intake, causing an air block.
I prefilled the hose from the pump outflow to the heat exchanger to try to avoid an air block.
Any thoughts on next steps?
http://forums.sbo.sailboatowners.com/showthread.php?t=148014
and added speed-seal life, and replaced the existing belt with a 3L180 belt. It's actually good that I replaced the belt, because examination revealed to tears in the previous belt.
I replaced the old tubing going from the raw water filter to the pump, and from the pump outflow to the heat exchanger, with 3/4" ID Shieldsflex, because I needed longer length hose> I re-routed the hose from the pump outflow to the heat exchanger, so it's now in front of, and not behind the V belts. I replaced the impeller and gasket, when I installed the Spead Seal life.
After connecting the new host to the pump intake and exhaust, and before tightening up the belts, I tried to manually rotate the pump, clockwise, hoping to prime it.
After starting up the engine there was only a dribble of fluid out the exhaust. I shut the engine off after 5 to 10 minutes, not wanting to overheat anything. The pump specs are
Johnson Pump F4B-903, 10-24509-01. Impeller Johnson 810B-1
Questions.
How long after starting the engine, should I see water coming out the exhaust.?
Could there be air in the hose between the raw water strainger and the raw water pump intake, causing an air block.
I prefilled the hose from the pump outflow to the heat exchanger to try to avoid an air block.
Any thoughts on next steps?
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