Jim: This may not apply to you or anyone else for that matter, but when the pump on one of our Yanmar 2GM20's (approximately 1,600 hours) stopped pumping, we took it apart and discovered that, although the impeller was still in decent shape, the cam was worn away to nothing, leaving an almost perfectly round pump housing. The Yanmar dealer was amazed that it hadn't quit working a lot sooner. Anyhow, replacing the cam fixed it right up. I was pleased since the cam cost a small fraction of what the pump cost.
Phil s/v Sunshine PDQ 36 While we were in Beautfort, SC. I took off the raw water pump to inspect the impeller since I hadn't done so before we left and all seemed fine. I forgot to turn the water back on and ruined the pump and had to order a new one. After installing the new one the engine temp came back to normal or below even at max rpms.
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