Water Pump Repair Kit – Fits Yamaha 50-70 HP Outboards (Replaces 6H3-W0078-02-00)

Water Pump Repair Kit – Fits Yamaha 50-70 HP Outboards (Replaces 6H3-W0078-02-00)

This water pump repair kit is designed to fit a range of Yamaha outboard motors. It is compatible with 2-stroke models from 60-70 HP (1992–2003), including C60, E60, and P60 models. It also fits 4-stroke 50 HP T50 (1997–2010) and 60 HP T60 (2003–2010) models.

This kit serves as a direct replacement for several OEM and aftermarket part numbers, ensuring a precise fit and restoration of function for your engine's cooling system.

• Installation Method: Direct replacement for the original water pump assembly.
• Engine Compatibility: Fits select Yamaha 2-stroke and 4-stroke outboard models.
• Complete Kit: Includes all necessary gaskets, impeller, O-rings, and bolts for a full service.

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 Insert, Cartridge (663-44322-00-00)
• 1 x Impeller (6H3-44352-00-00)
• 1 x Water Pump Gasket (6H3-44315-A0-00)
• 1 x Outer Plate, Cartridge (6H3-44323-00-00)
• 1 x Cartridge Gasket (6H3-44324-A0-00)
• 1 x Water Pump Gasket (688-44316-A0-00)
• 1 x O-Ring (93210-46044-00)
• 2 x Bolts, With Washer (90119-08M14-00)
• 2 x Bolts, With Washer (90119-08M33-00)
• 1 x Woodruff Key (90280-03M03-00)

Explosion Diagram

Installation Guide

1. Safety First: Ensure the engine is off and the battery is disconnected. Secure the vessel to prevent unexpected movement.
2. Access the Lower Unit: Remove the lower unit (gearcase) from the outboard motor. This typically involves removing several bolts connecting it to the engine leg.
3. Remove Old Pump: Unbolt and carefully lift the old water pump housing. Take note of the position of all parts as you remove them.
4. Clean Surfaces: Thoroughly clean the mounting base and driveshaft, removing any old gasket material or debris.
5. Install New Components: Slide the new Woodruff key and then the new impeller onto the driveshaft. Ensure the impeller vanes are oriented correctly (typically clockwise).
6. Assemble New Housing: Place the new gaskets, cartridge insert, and outer plate. Secure the new water pump housing with the provided bolts, tightening them to the manufacturer-specified torque.
7. Reinstall Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly.
8. Final Checks: Reconnect the battery. Start the engine in a suitable water source and check for a steady stream of water from the tell-tale port, confirming proper pump operation.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check your engine's model, HP, and year against our compatible models table. For Yamaha owners, you can use the official Yamaha Serial Number Guide to verify your details. Cross-referencing the part number from your old pump or service manual with our list also helps ensure a match.

What are the signs my water pump needs replacing?
Common signs of a failing water pump include the engine overheating at idle or low speeds, an inconsistent or weak water stream from the "tell-tale" outlet, and in severe cases, a steam or hot water discharge.

How often should I replace the water pump impeller?
As a critical maintenance item, it is recommended to inspect the impeller annually and replace it every 100-200 operating hours or every 1-2 years, regardless of hours. This prevents the rubber from degrading and failing unexpectedly.

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.