Water Pump Impeller Repair Kit – Fits Yamaha 8HP/9.9HP Outboards (Replaces 68T-W0078-00-00)

Water Pump Impeller Repair Kit – Fits Yamaha 8HP/9.9HP Outboards (Replaces 68T-W0078-00-00)

This is a complete water pump repair kit for Yamaha 4-stroke 8HP and 9.9HP outboard engines. The kit provides all components required for a full and reliable water pump rebuild, ensuring your engine maintains proper cooling performance.

This assembly is a direct replacement for Yamaha part numbers 68T-W0078-00-00, 68T-W0078-01-00, and 68T-W0078-02-00, as well as Sierra 18-3450 and Mallory 9-48613.

• Includes impeller, housing components, seals, and hardware for a comprehensive service.
• Features an impeller manufactured from high-quality rubber formulated to withstand extended saltwater immersion.
• Designed for direct OEM replacement with no modifications needed for installation.

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 Cartridge Insert (63V-44322-00-00)
• 1 x Water Seal Damper 2 (68T-44366-00-00)
• 1 x Impeller (68T-44352-00-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x O-Ring (93210-44704-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 4 x Bolts (97095-08045-00)

Installation Guide

1. Disconnect the negative battery cable and remove the engine cover.
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, watching for the shift shaft and speedometer tube.
4. Place the lower unit on a workbench and remove the bolts for the water pump housing.
5. Slide the housing up and off the driveshaft to expose the impeller. Note the rotational direction of the old impeller vanes.
6. Remove the old impeller, woodruff key, wear plate, and gaskets.
7. Clean all mating surfaces thoroughly, removing any old gasket material or corrosion.
8. Install the new gasket, wear plate, and woodruff key from the kit.
9. Lightly lubricate the new impeller with marine grease and slide it onto the driveshaft, turning it in the direction of engine rotation to seat the vanes.
10. Apply a thin layer of grease to the inside of the new pump housing and install it over the impeller.
11. Secure the housing with the new bolts provided, tightening them to the manufacturer's torque specifications.
12. Reassemble the lower unit to the engine, ensuring the driveshaft, shift shaft, and water tube align correctly before tightening bolts.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: First, check your engine model, horsepower, and year against the "Compatible Engine Models" table above. This kit is specifically for Yamaha 4-stroke 6HP, 8HP, and 9.9HP models manufactured up to June 2008. It directly replaces OEM part number 68T-W0078-00-00 and its successors. Verifying your existing part number is the best way to guarantee fitment.

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

A: The most common signs are a weak or non-existent water stream from the engine's tell-tale outlet, frequent engine overheating alarms, or a melted water pump housing. During a visual inspection, a worn impeller will have cracked, brittle, or permanently curved vanes.

Q: How often should I replace the impeller?

A: As a crucial part of preventative maintenance, we recommend replacing your impeller every 1 to 2 years or every 100-200 hours of operation. Service intervals should be shorter if you frequently operate in saltwater, silt, or sandy conditions.

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.