Water Pump Impeller Kit – Fits Yamaha 6HP / 8HP Outboard Motors (Replaces 6E5-44311)

Water Pump Impeller Kit – Fits Yamaha 6HP / 8HP Outboard Motors (Replaces 6E5-44311)

This water pump impeller repair kit is designed for Yamaha 2-stroke 6HP and 8HP outboard motors (1986 and newer) and select 4-stroke 115HP and 130HP models. It provides a reliable solution for maintaining your engine’s cooling system.

This kit serves as a direct replacement for Yamaha part numbers 6E5-44311, 6E5-W0078-A1-00, 6N0-W0078-A0-00, 6E5-W0078-01-00, and 6E5-W0078-02. It is also cross-compatible with Sierra 18-3460 and Mercury/Mariner 11656T/11656M.

• Installation Method: Direct replacement for a straightforward installation.
• Comprehensive Kit: Includes a new impeller, wear plate, gaskets, o-rings, and hardware.
• Quality Manufacturing: Produced in an ISO9002 certified facility to meet or exceed OEM specifications.

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.

Technical Specifications

Package Contents

• 1 x Impeller (6E5-44352-01)
• 1 x Wear Plate (6E5-44323-00)
• 1 x Gasket (6E5-44315-A0)
• 1 x Cartridge Insert (6E5-44322-40) (1" shaft)
• 1 x O-ring (93210-86M38)
• 1 x O-ring (93210-37M67)
• 4 x Bolts (97080-08045)
• 1 x Dowel Pin (93606-12019)
• 1 x Woodruff Key (90280-04M05)

Installation Guide

1. Disconnect the battery and remove the engine cowling.
2. Shift the outboard into neutral and remove the bolts securing the lower unit (gearcase).
3. Carefully separate the lower unit from the upper casing.
4. Unbolt and remove the water pump housing cover.
5. Slide the old impeller off the driveshaft, removing the woodruff key.
6. Remove the old wear plate, gaskets, and seals. Clean all mating surfaces thoroughly.
7. Install the new gasket and wear plate onto the lower unit.
8. Place the new woodruff key in its slot on the driveshaft and slide the new impeller on, turning clockwise to seat the vanes.
9. Install the new cartridge insert, o-rings, and other components as supplied in the kit.
10. Re-install the water pump housing and tighten the bolts to the manufacturer's specified torque.
11. Re-attach the lower unit to the engine, ensuring the driveshaft and water tube align correctly.
12. Securely tighten all bolts, reconnect the battery, and test the engine's cooling function with a water supply.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check the "Compatible Engine Models" table for your specific model and year range. Second, cross-reference your existing part number with the list under "Part Number Cross-Reference." This ensures an exact match.

What is the difference between this kit and other similar Yamaha kits?
This kit is specified as a replacement for part number 6E5-44311 and its equivalents. While similar to kits like 6N6-W0078-02, it contains a different cartridge insert. Always verify the components match your specific engine requirements.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect and likely replace your impeller annually or every 100 hours of use, whichever comes first. Signs of a failing impeller include the engine overheating at idle speeds or a weak water tell-tale stream.

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.