4JH4E, 2500 hours, 42' sailboat.
I am troubleshooting some issues with losing raw water
prime after being out for a sail. When starting up after a sail to windward, no water
comes out the exhaust
. Either briefly loosening the raw water
cover (after closing the seacock and cracking open the strainer cap), or a couple of revs of the engine
, gets it going again. The boat
has never had this problem before.
I've checked the Vetus above-waterline strainer cap. When I lose prime, the strainer is still full of water
and does not seem to have lost
any when I have lost
prime. I've cleaned the Vetus anti-siphon valve. So I am now looking at the raw water pump
. The wear plate seems a bit worn. I've seen suggestions to simply turn it over, but I am inclined to just replace it. If I do replace it should anything be done to prep the plate such as wetsanding with 600 on a glass plate?