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Sherwood G21 Raw Water Pump rebuild |
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KENO 
Grand Poobah 
Joined: June-06-2004 Location: United States Status: Offline Points: 11250 |
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 Topic: Sherwood G21 Raw Water Pump rebuildPosted: Today at 7:42pm |
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Sherwood had 2 different part numbers.
The early original one had was 10627 and it was superseded over the years by the one you have now. The new one's part number is 15883 I Really don't remember when it happened but it was obviously after 1985  Never really noticed a difference in pump performance/engine cooling unless a really crappy, scored up, wasted old one was being replaced with a shiny new one. The old one looked like your old one and the new one looks like your new one. No appreciable wear, just a difference in length around the circumference. By the way , how are those engine drain plug holes treating you? |
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1985 Nautique
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Joined: October-10-2024 Location: Bloomington, IL Status: Offline Points: 29 |
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Posted: Today at 11:44am |
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As my 1985 Ski Nautique is bumping 40 years old, there were some maintenance items which needed to be addressed in the off season. One of these is the rebuild of the raw water pump. It has never been rebuilt...
Turns out that when the pump was disassembled, the snap ring holding the seal to the shaft snapped the second it was expanded. Instantaneous validation that doing the rebuild now probably saved a lost weekend and a headache on the water. The rebuild kit was purchased from an eBay seller with the name: rawpumps The pump rebuild kit was just about $110 with tax and shipping. It includes new bearings, a new impeller, a new set of seals, an O-Ring, and all the snap rings required for the rebuild. Turns out his shop is in East Peoria which is not too far from my home in Bloomington, IL. The pump was disassembled and reassemble in a friends shop. No issues with that. You're going to need a hydraulic press. Upon reassembling the cam to the inside of the impeller housing, it was noted the old cam was much smaller than the replacement cam. I thought the old one may have had some wear on it due to being in service for almost 40 years. NOPE!!! Turns out there are two sizes of cams which can be used on these pumps. An email message was sent off due to the discrepancy in size. Here is Joe's response "There is a chance yours did wear down but the 5.7L V8 needs the flow to keep it cool." So.....IF you have a boat with a mysterious overheating issue, your raw water pump may be the culprit!! Good luck and I hope this helps someone out with their overheating issues.  |
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Brian
1985 Ski Nautique "I've spent half of my money on women, liquor, and boats. The other half I wasted." |
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