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Ok. Went to the boat today. In the first photo you can see the raw water inlet with a nut on the top, underneath which is a gauze filter, which I cleaned. Not great. Sort of out of sight out of mind. The second photo shows the raw water pump, which looks to be needing servicing or replaced. And the third photo is the engine pulley running the internal water pump, which it is behind, and is not leaking, so should be ok. Thanks for all the help. I think I’ve got the gist of it now, and Bob’s idea of a separate see through strainer is obviously the best way to go, because you can see it visually every time you check the engine and it’s quite large, so would take a lot to block it, unlike mine. Paul
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Thanks for all your replies. I’m going down to the boat tomorrow and I’ll take some photos and post them. I was confused about the absence of a water strainer which most boats have, like the one in your boat Bob. I’ll look into that. So the diagram of the pump you’ve posted, Bob, is located behind the pulley on the crankshaft, Johnson F5B8, I think. I won’t have to look at that, I hope. The raw water pump on my boat is a Jabsco 4900 and is run by the other v belt, not the alternator one, and takes an impeller at the back of the pump. It doesn’t seem to be in great shape. I’ll take a picture and show you. Again, thanks for the replies and I look forward to getting my burgee this week.