Water Pump Impeller Repair Kit – Fits Yamaha 4HP/5HP Outboard Motors (Replaces 6E0-W0078-A2-00)

Water Pump Impeller Repair Kit – Fits Yamaha 4HP/5HP Outboard Motors (Replaces 6E0-W0078-A2-00)

This water pump impeller repair kit provides the necessary components to service the lower unit water pump on Yamaha 2-stroke 4HP (1984–1999) and 5HP (1984–2002) models, as well as 4-stroke F4 (1999–2008) outboards.

It serves as a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring a precise fit for a complete and reliable water pump service.

• Direct Replacement Installation: Designed to OEM specifications for a direct fit without modifications.
• Complete Service Kit: Includes the impeller, housing, gaskets, plates, and hardware required for a full overhaul.
• Durable Materials: Constructed with a robust neoprene rubber impeller and stainless steel plates for longevity and corrosion resistance.

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 Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Water Pump Housing (6E0-44311-00-00)
• 1 x Water Pump Gasket (6E0-44315-A0-00)
• 1 x Cartridge Insert (6E0-44322-02-00)
• 1 x Cartridge Outer Plate (6E0-44323-00-00)
• 1 x Impeller (6E0-44352-00-00)
• 1 x Water Seal Damper 2 (6E0-44366-00-00)
• 1 x Dowel Pin (93604-09066-00)
• 4 x Bolt (97080-06045-00/97095-06045-00)

Installation Guide

1. Disconnect the shift linkage and remove the bolts securing the lower unit (gearcase). Carefully lower the unit away from the outboard.
2. Locate and unbolt the water pump housing.
3. Remove the old impeller, gaskets, and wear plates, noting their orientation for reassembly.
4. Thoroughly clean all mating surfaces, removing any old gasket material or debris.
5. Install the new cartridge insert and then place the new outer plate and gasket.
6. Slide the new impeller onto the driveshaft. Turn the driveshaft clockwise while pushing down to seat the impeller vanes correctly.
7. Position the new housing over the impeller and tighten the bolts to the manufacturer's recommended torque specification.
8. Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
9. Reconnect the shift linkage, and test the engine with a proper water supply before operation.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific engine?
A: Please check the "Compatible Engine Models" tables on this page. Match your engine's brand, model, horsepower, and year range. For Yamaha and Mariner models, cross-referencing the serial numbers listed in the notes can also confirm fitment.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include a weak or intermittent water stream from the "telltale" outlet, engine overheating alarms, or a visible reduction in cooling performance.

Q: How often should the water pump impeller be replaced?
A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).

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.