Impeller Kit – Fits Sherwood 10077K Pumps and Onan Generators

Impeller Kit – Fits Sherwood 10077K Pumps and Onan Generators

This replacement impeller kit is a direct fit for various Sherwood water pumps commonly used in inboard engines and Onan generators. It serves as a crucial component for maintaining proper engine cooling system performance, ensuring reliability during operation.

Engineered to meet or exceed original equipment specifications, this kit provides a cost-effective solution for routine maintenance or repair. It directly replaces Sherwood part numbers 10077K and 10077K-SHW, as well as Onan numbers 0132-0375 and 0132-0498.

• Impeller Material: Made from durable neoprene for reliable performance in marine environments.
• Impeller Design: Features a 12-blade silhouette for efficient water flow.
• Complete Kit: Includes one impeller, three gaskets, and one o-ring for a comprehensive 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 Pumps

Onan Generator Models

Technical Specifications

Package Contents

• 1 x Impeller
• 3 x Gaskets
• 1 x O-ring

Installation Guide

1. Prepare the Engine: Ensure the engine is completely cool and turned off. Close the raw water intake seacock to prevent water from entering the vessel.
2. Access the Pump: Locate the sea water pump. You may need to remove any connected hoses to gain clear access to the pump's faceplate.
3. Remove the Cover: Carefully unscrew the bolts holding the pump cover plate in place and remove the plate. Note the orientation of the old gasket.
4. Extract the Old Impeller: Using needle-nose pliers or a dedicated impeller puller tool, grip the center hub of the old impeller and pull it straight out of the housing.
5. Clean and Inspect: Thoroughly clean the interior of the pump housing, removing any debris or old gasket material. Inspect the housing and cover plate for scoring or wear.
6. Install New Gasket/O-Ring: Place the new gasket or O-ring (as required by your model) onto the pump housing, ensuring it is seated correctly.
7. Insert the New Impeller: Lightly lubricate the inside of the housing and the new impeller with a water-resistant grease or liquid soap. Insert the new impeller with a twisting motion, ensuring the blades bend in the direction of the pump's natural rotation.
8. Reassemble and Test: Reinstall the cover plate and tighten the screws evenly in a star pattern to ensure a proper seal. Reconnect all hoses, open the seacock, and start the engine to check for leaks and proper water flow.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my specific engine?
A: The best way is to match your existing part number to our "Part Number Cross-Reference" list. You can also compare the specifications, particularly the impeller dimensions (Width: 25/32", Diameter: 2-1/4") and shaft type (1/2" key drive), to your old part. Finally, check our detailed "Compatible Engine Models" tables for your Sherwood pump or Onan generator model.

Q: What are the main signs that an impeller needs to be replaced?
A: Common indicators of a failing impeller include the engine running at a higher-than-normal temperature, a noticeable reduction in water flow from the exhaust port, or visible signs of damage like cracked, stiff, or missing blades upon inspection.

Q: How often should I replace my water pump impeller as part of regular maintenance?
A: As a general rule for preventative maintenance, we recommend replacing the impeller at least once every season or every 100-200 hours of engine operation, whichever comes first. This helps prevent unexpected failures and potential engine damage from overheating.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.