Water Pump Impeller Kit – Fits Yamaha 2-Stroke 25–30 HP Outboard Engines (Replaces 689-W0078-A4-00, 689-W0078-04-00)

Water Pump Impeller Kit – Fits Yamaha 2-Stroke 25–30 HP Outboard Engines

This water pump impeller repair kit provides all the necessary components to restore the cooling system on select Yamaha 2-stroke 25 HP and 30 HP outboard engines. It is designed to meet or exceed original equipment specifications for a reliable, direct-fit installation.

This kit is a direct replacement for Yamaha outboard models including 25 HP (1986–1997) and 30 HP (1986–1992), covering C25, C30, CV25, and CV30 engine series. It also cross-references with parts for specific Mercury/Mariner models.

• Installation Type: Direct replacement for a complete water pump overhaul.
• Core Components: Includes impeller, housing, wear plate, gaskets, and hardware.
• Materials: Features a marine-grade metal housing and a durable CR Neoprene Rubber impeller for longevity.

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. 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 Outboards

Mercury/Mariner Outboards

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (689-44352-02-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x Water Pump Housing (689-44311-03-00)
• 1 x Insert Cartridge (689-W4432-01-00 / 689-W4432-02-00)
• 1 x Wear Plate/Cartridge Outer Plate (689-44323-02-00 / 689-44323-03-00)
• 1 x Cartridge Gasket (689-44324-A0-00)
• 1 x Water Pump Gasket (689-44316-A0-00)
• 1 x Water Seal Damper (626-44365-01-00 / 626-44365-02-00)
• 3 x Bolt with Washer (97080-06030-00 / 90119-06M07-00)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is securely mounted.
2. Access the Lower Unit: Drain the gearcase oil. Remove the bolts securing the lower unit (gearcase) to the upper engine housing.
3. Remove the Old Pump: With the lower unit separated, locate and unbolt the water pump housing.
4. Disassemble: Carefully remove the old housing, impeller, gaskets, and wear plate. Clean all mating surfaces thoroughly.
5. Install New Components: Install the new wear plate, gaskets, and woodruff key on the driveshaft.
6. Install Impeller: Slide the new impeller onto the driveshaft, turning the shaft clockwise to bend the vanes correctly.
7. Install Housing: Lubricate the inside of the new insert cartridge and housing, then slide it down over the impeller.
8. Reassemble: Secure the new housing with the provided bolts, torqued to manufacturer specifications.
9. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align. Bolt it securely.
10. Final Checks: Refill the gearcase with fresh oil. Reconnect the battery.
11. Test Operation: Start the engine in the water or with a proper flushing attachment ("muffs") and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: The most reliable method is to match your engine's model and year against the compatibility tables above. We also recommend using the provided model identification guides and part number cross-reference to verify a match before ordering.

Q: What are the common signs of a failing water pump impeller?
A: Key symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and in some cases, a faint burning rubber smell if the impeller has run dry and disintegrated.

Q: How often should I replace the water pump impeller?
A: As a general rule 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.