Water Pump Impeller Kit – Fits Yamaha 9.9/15 HP (Replaces 682-W0078-A1-00)

Water Pump Impeller Kit – Fits Yamaha 9.9/15 HP (Replaces 682-W0078-A1-00)

This water pump repair kit is designed for a range of Yamaha and Mariner outboard engines. It fits Yamaha 2-stroke 9.9 HP and 15 HP models (1984–1995) and specific 4-stroke 8 HP and 9.9 HP models. The kit is also compatible with Mariner 9.9C (Code 682) and 15C (Code 684) outboards for all model years.

This kit is a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for a complete water pump service. It is manufactured to meet or exceed original equipment specifications for reliable performance.

• Installation: Designed as a direct OEM replacement that fits the original housing without modification.
• Durability: Features a marine-grade, high-quality rubber impeller designed for longevity and damage resistance in both salt and freshwater.
• Complete Kit: Includes all necessary components for a comprehensive service: a new impeller, gaskets, plate, insert cartridge, water seal, bolts, and woodruff key.

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.

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

Yamaha Models

Mariner Models

Technical Specifications

Package Contents

• 1 x Impeller (682-44352-03-00)
• 1 x Cartridge Insert (682-44322-00-00)
• 1 x Outer Plate, Cartridge (682-44323-00-00)
• 2 x Water Pump Gaskets (682-44315-A0-00)
• 1 x Water Seal Damper (682-44365-00-00)
• 1 x Woodruff Key (90280-03024-00)
• 4 x Bolts (97080-06045-00)

Installation Guide

1. Safety First: Disconnect the battery and shift the outboard into neutral.
2. Drain Gear Lube: Place a drain pan under the lower unit and remove the upper and lower gear lube drain screws to drain the oil.
3. Remove Lower Unit: Remove the bolts securing the lower unit to the engine's upper casing. Carefully separate the lower unit.
4. Access Water Pump: The water pump housing is located on top of the lower unit. Remove the bolts securing the housing cover.
5. Disassemble Pump: Lift off the housing. Slide the old impeller, gaskets, and wear plates off the driveshaft, noting the rotational direction of the impeller fins.
6. Clean Surfaces: Thoroughly clean all mating surfaces, removing any old gasket material or debris.
7. Install New Components: Place the new gasket and cartridge plate. Insert the new woodruff key into the driveshaft and slide the new impeller on, rotating it clockwise to seat the fins correctly.
8. Reinstall Housing: Apply a bit of marine grease to the inside of the new cartridge insert and slide it over the impeller. Reinstall the housing and tighten the bolts to the manufacturer's specified torque.
9. Reassemble: Reinstall the lower unit to the engine. Refill the gearcase with fresh marine gear lube from the bottom plug until it flows from the top hole. Reinstall both plugs.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?

A: The best way is to check the part number on your original component. Cross-reference it with the numbers in our "Part Number Cross-Reference" table. Additionally, consult the "Compatible Engine Models" tables to ensure your specific engine model and year are listed.

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

A: A weak or no water stream from the "tell-tale" port is the most common sign. Other indicators include the engine overheating alarm sounding or steam coming from the exhaust. Prompt replacement is critical to prevent engine damage.

Q: How often should I replace my impeller?

A: For preventative maintenance, it is recommended to replace the water pump impeller every 1 to 2 years, or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater, sandy/silty water).

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.