Water Pump Impeller Kit – Fits Kohler Marine Generators 4-8EF/5-7.3E (Replaces Kohler 359978, Sherwood 8000K)

Water Pump Impeller Kit – Fits Kohler Marine Generators 4-8EF/5-7.3E (Replaces Kohler 359978, Sherwood 8000K)

This water pump impeller kit is designed for Kohler Marine Generators from the 4–8 HP series, including models 4EF, 5E, 6EF, 7.3E, and 8EFK. It is specifically compatible with generator models that were originally equipped with Sherwood G8000, G8001, or G8002 series raw water pumps.

This kit serves as a direct replacement for several OEM and aftermarket part numbers, including Kohler 359978, Sherwood 8000K / 08000K, Sierra 23-3314, Onan 132-0415, CEF 500190, JMP 7013, and DJ Pump 09-107-0601.

• Includes one neoprene impeller and one nitrile O-ring for a complete replacement.
• Engineered with a brass hub for enhanced durability and corrosion resistance in marine environments.
• Designed for a direct fit, featuring a 12mm D-slot shaft drive.

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.

Kohler Marine Generators

Onan Marine Generators

Technical Specifications

Package Contents

• 1 x Impeller (Neoprene with Brass Hub)
• 1 x O-Ring (Nitrile 70)

Installation Guide

Proper installation is critical for performance. Always lubricate the new impeller before installation.

1. Shut off the engine and close the raw water intake valve (seacock).
2. Remove the cover plate from the water pump housing.
3. Use pliers or an impeller puller to firmly grip the hub of the old impeller and pull it straight out of the housing.
4. Clean any old gasket material or debris from the housing and cover plate surfaces. Inspect the housing for cracks or scoring.
5. Apply a liberal amount of lubricant (glycerine, silicone grease, or dish soap) to the interior of the pump housing and to the new impeller. Warning: Do not use petroleum-based lubricants as they can damage the neoprene.
6. Insert the new impeller into the housing. As you push it in, rotate the shaft to bend the blades in the same direction as the pump's normal rotation.
7. Place the new O-ring into the groove on the pump body or cover.
8. Re-install the cover plate, ensuring it is seated correctly, and tighten the screws in an alternating pattern to ensure an even seal.
9. Once the pump is reassembled, open the raw water intake valve.
10. Start the engine and immediately check for any water leaks around the pump cover and verify a steady stream of water from the exhaust outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Kohler generator?

A: This impeller is designed for Kohler generator models in the 4HP to 8HP range (such as 4EF, 5E, 6EF, 7.3E, and 8EFK series) that are factory-equipped with a Sherwood G8000, G8001, or G8002 series pump. The most reliable method is to check your pump model or cross-reference your existing impeller's part number against our list, which includes Kohler 359978 and Sherwood 8000K.

Q: What indicates that my water pump impeller needs to be replaced?

A: The most common signs of a worn or failed impeller are engine overheating at idle or low speeds, and a noticeable reduction in water flow from the exhaust outlet. Upon inspection, you may also see visible cracks, stiffness, or missing blades on the old impeller.

Q: How often should I replace the impeller?

A: As a preventative maintenance measure, we recommend inspecting your impeller annually and replacing it every 1-2 years, depending on usage. If you frequently operate your vessel in sandy or debris-heavy water, more frequent replacement may be necessary.

Q: What is the benefit of the neoprene and brass construction?

A: The impeller is made from a durable neoprene rubber compound designed to resist wear and fatigue in a raw water environment. The brass hub provides superior strength and corrosion resistance compared to plastic or other metal hubs, ensuring a long service life.

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.