Water Pump Impeller Kit – Fits Sherwood Pumps (Replaces Sherwood 10077K, Onan 132-0375)

Water Pump Impeller Kit – Fits Sherwood Pumps (Replaces Sherwood 10077K, Onan 132-0375)

This is a high-quality aftermarket water pump impeller kit designed for Sherwood raw water pumps. It is commonly used on a wide range of inboard marine engines and generators, including Sherwood pump models R30G, G701, G702, H70, H80, and others from brands like Onan, Westerbeke, Chris Craft, and Crusader.

This kit serves as a direct replacement for numerous OEM and aftermarket part numbers, ensuring broad compatibility and reliable performance for engine cooling, water transfer, and bilge pumping duties.

• Installation Type: Direct replacement for a hassle-free fit.
• Primary Materials: Features a durable neoprene rubber impeller with a solid brass insert for corrosion resistance.
• Complete Kit: Includes one impeller, one O-ring, and three gaskets to perform a full service.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Sherwood Pump Applications

Onan Generator Applications

Technical Specifications

Package Contents

• 1 x Impeller (Replaces Sherwood 10077K)
• 1 x O-Ring
• 3 x Gaskets

Installation Guide

1. Turn Off Power: Ensure the engine is off and the battery is disconnected. Close the water inlet seacock.
2. Access the Pump: Locate the raw water pump and remove the cover plate screws.
3. Remove Old Impeller: Carefully remove the old impeller using impeller pullers or two screwdrivers. Note the orientation of the blades.
4. Clean the Housing: Inspect the pump housing for wear, scoring, or debris. Clean the interior surfaces and cover plate.
5. Install New Gasket/O-Ring: Place the new gasket or O-ring (as required) onto the pump body.
6. Insert New Impeller: Lightly lubricate the inside of the housing with water or silicone grease. Insert the new impeller with the blades bent in the same direction as the old one.
7. Replace Cover Plate: Reinstall the cover plate and tighten the screws in a star pattern to ensure an even seal.
8. Final Checks: Reconnect the battery and open the seacock. Start the engine and check immediately for leaks and proper water flow.

Troubleshooting & FAQ

How do I confirm this impeller fits my pump?
The best way is to check the part number on your existing impeller or in your engine's service manual. You can also compare the dimensions (diameter, width, shaft size) listed in our Technical Specifications with your old part. Finally, cross-reference your pump model (e.g., Sherwood G701) or engine model with our compatibility tables.

What are the signs of a failing impeller?
Common signs include engine overheating, reduced water flow from the exhaust outlet, visible cracks or missing blades on the impeller, and a stiff or brittle texture. It is crucial to inspect the impeller regularly as part of routine maintenance.

How often should I replace the water pump impeller?
As a general rule, impellers should be inspected annually and replaced every 1-2 years or every 100-200 hours of use, whichever comes first. Replacement intervals may be shorter in saltwater or high-sediment environments.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.