Water Pump Impeller Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP (Replaces 763758, 391391, 778166)

Water Pump Impeller Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP (Replaces 763758, 391391, 778166)

This water pump impeller repair kit is designed for Johnson/Evinrude 5.5HP and 6HP (1954–1979) and 7.5HP (1954–1958) 2-stroke outboard motors. It is a direct replacement for models equipped with plastic pump housings.

This kit directly replaces Johnson/Evinrude part numbers: 763758, 391391, 778166, 382797, 389228, and 379771.

• Complete kit includes a neoprene impeller, housing, wear plate, and all necessary gaskets and hardware.
• Designed for installation in the lower unit on engines with plastic pump housings.

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. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Impeller
• 1 x Pump Housing
• 1 x Pump Cup
• 1 x Wear Plate
• 1 x Gasket
• 1 x Grommet
• 1 x Bolt
• 4 x Screws

Installation Guide

1. Disconnect the shift linkage and remove the bolts securing the lower unit. Carefully separate the lower unit from the upper casing.
2. Locate the water pump and remove the housing screws to access the impeller.
3. Take note of the old impeller's blade direction before removing it. Remove the old gaskets and wear plate.
4. Thoroughly clean all mating surfaces, removing any old gasket material or debris.
5. Install the new wear plate and gasket.
6. Slide the new impeller onto the driveshaft. Turn the driveshaft clockwise while pushing down on the impeller to seat the blades correctly inside the pump cup.
7. Place the new pump cup and gasket onto the assembly.
8. Install the new housing and tighten the screws in a star pattern to ensure an even seal.
9. Reinstall the lower unit, making sure the driveshaft, shift shaft, and water tube are correctly aligned.
10. Secure the lower unit with its mounting bolts and reconnect the shift linkage.
11. Before starting the engine, supply water to the lower unit using a flush device ("muffs") to check for proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I know if this kit fits my outboard?

A: This kit is specifically for Johnson/Evinrude 5.5HP & 6HP (1954–1979) and 7.5HP (1954–1958) models that use a plastic pump housing. Check the compatibility table and visually confirm your engine has a plastic housing before ordering.

Q: What are the signs of a failing water pump impeller?

A: Common signs of a bad impeller include the engine overheating at low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or finding cracked, brittle, or melted blades on the old impeller during an inspection.

Q: How often should the impeller be replaced?

A: For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years, depending on usage. If you frequently operate in sandy, silty, or saltwater environments, more frequent replacement may be necessary.

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.