Jim
If nothing looks wrong on the pump, then most likely you'll have to follow
the water flow, step by step; it is entirely possible that an air lock
might have occurred even though you had water flow initially. First, see if
the impeller turns, pull the cover and watch when you turn the engine over.
If it does, reinstall the cover, first squirting some liquid soap over the
impeller and making certain that the cover seals properly. You've pulled
the hose and opened the seacock and had water flow to the pump, but double
check again. If you saw that the impeller turned, next reinstall the hose
on the intake side of the pump, pull the hose off the discharge port on the
pump, start the engine and see if the pump pushes water out the discharge.
If so, reinstall the hose and pull the hose off the next item, maybe the
heat exchanger. Start the engine and see if water pumps out the hose. If
so, reinstall the hose and run the engine and see if water comes out the
exhaust once the muffler fills. Not often, but I've had a few instances
when I had to do this procedure a couple time until I had good, constant
water flow. If you get to a point where there is no water flow, then
consider that there is a blockage from that point on.

*Rudy & Jill Sechez *
*BRINEY BUG-a 34' Sail-Assisted Trawler  *
Anchoring Consultants-trawlertrainingabc.com
*850-832-7748 *
Carolina Bch SC Northbound-Chesapeake

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I have not followed to closely but if this was a Yanmar they are know to fail in the exhaust elbow which will completely stop the water flow usually just before crumbling. Check and be prepared to replace it.

Sorry not good

On May 25, 2020, at 6:59 PM, Rudy Sechez via Trawlers-and-Trawlering trawlers@lists.trawlering.com wrote:

Jim
If nothing looks wrong on the pump, then most likely you'll have to follow
the water flow, step by step; it is entirely possible that an air lock
might have occurred even though you had water flow initially. First, see if
the impeller turns, pull the cover and watch when you turn the engine over.
If it does, reinstall the cover, first squirting some liquid soap over the
impeller and making certain that the cover seals properly. You've pulled
the hose and opened the seacock and had water flow to the pump, but double
check again. If you saw that the impeller turned, next reinstall the hose
on the intake side of the pump, pull the hose off the discharge port on the
pump, start the engine and see if the pump pushes water out the discharge.
If so, reinstall the hose and pull the hose off the next item, maybe the
heat exchanger. Start the engine and see if water pumps out the hose. If
so, reinstall the hose and run the engine and see if water comes out the
exhaust once the muffler fills. Not often, but I've had a few instances
when I had to do this procedure a couple time until I had good, constant
water flow. If you get to a point where there is no water flow, then
consider that there is a blockage from that point on.

*Rudy & Jill Sechez *
*BRINEY BUG-a 34' Sail-Assisted Trawler  *
Anchoring Consultants-trawlertrainingabc.com
*850-832-7748 *
Carolina Bch SC Northbound-Chesapeake

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