Raw Water Pump Failure
After 700 Engine hours the raw water pump on the Cummins started leaking. The leak was not immediately apparent. However the effect was quite noticeable as corrosion was visible on the port side front engine mount. Tightening the bolts on the impeller plate and hose connections did not solve the problem. A little research on the web indicated the problem might be the design of the shaft seals on the Sherwood raw water pump. Once the pump was removed it was immediately apparent that the shaft seals were the source of the problem. The Sherwood pump p/n P2701 apparently has demonstrated repeated reliability problems. The pump has been revised numerous times and has been replaced by p/n P2708 which lists for $875. A little further web searching revealed a wide range of pricing on this pump. I was able to find the pump for $577. Old pump removal and installation of the new pump was easier than expected and took less then an hour and a half. Access is excellent and nothing is too challenging. Given the wide range of pricing I would not be too surprised if the pump can be found for less.
BoatStore.com. Sherwood P2708X Pump-Cummins Qsb. SKU. 762-P2708X. Price. $577.86
I plan to get the old pump rebuilt with the newer seal design if possible for a spare. If there are any recommendations please don't hesitate to update this thread.
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