Sherwood 12937 Water Pump Major Repair Kit
Sherwood 12937 Water Pump Major Repair Kit
Sherwood
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Sherwood 12937 — Water Pump Major Repair Kit
Sherwood 12937 is a major repair kit containing the main components needed to rebuild various Sherwood sea water pumps, used on Universal Medalist engines with Sherwood R-10870-G and R50G pumps. A complete kit like this gets a tired pump back to reliable service without the cost of a full replacement. Includes bushing, ball bearing, seat and seal, 2 gasket/o-rings, impeller, cam, key, and 4 retaining rings. Replaces Sherwood 12936 and Westerbeke 33329.
Part Specifications
- Sherwood Part Number: 12937
- Type: Major water pump repair kit
- Application: Universal Medalist engines with Sherwood R-10870-G and R50G pumps
- Kit Contents: Bushing, ball bearing, seat and seal, 2 gasket/o-rings, impeller, cam, key, 4 retaining rings
- Replaces: Sherwood 12936; Westerbeke 33329
Confirm Fitment Before Ordering
Not sure if this kit matches your pump? You can check the parts diagrams available on our website to help identify the correct part. Or, give us your engine and pump model and we'll confirm it for you before you order — by email, text, or live chat.
Additional Information
- Vendor: Sherwood
- Part Number: 12937
- OEM Cross-Reference: Replaces Sherwood 12936, Westerbeke 33329
- Kit Contents: Bushing, ball bearing, seat and seal, 2 gasket/o-rings, impeller, cam, key, 4 retaining rings
Installation Notes
Install following the applicable Sherwood raw water pump service manual for your engine and pump model.
Frequently Asked Questions
Q: How do I confirm this kit fits my pump?
A: Check the parts diagrams available on our website, or send us your engine and pump model and we'll confirm 12937 is the correct repair kit for your Sherwood R-10870-G or R50G pump — by email, text, or live chat.
Q: Is this enough to fully rebuild my pump?
A: This major kit covers the core wear components — bearing, seal, impeller, cam, and hardware — giving you a thorough rebuild without replacing the pump housing itself.
Q: Does this replace Sherwood 12936?
A: Yes, 12937 is the current kit replacing the earlier Sherwood 12936, as well as Westerbeke 33329.
Q: How often should a raw water pump be rebuilt?
A: A common guideline is once per season or every 100 hours of use, whichever comes first, though a pump showing reduced flow or leaking should be serviced sooner.
Q: What lubricant should I use when installing the impeller?
A: Use a non-petroleum-based lubricant, since petroleum products can degrade the neoprene impeller and shorten its service life.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.