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Description
Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 6H3-W0078-02-00)Water Pump Impeller Repair Kit Fits Yamaha 40 60 HP Outboards (Replaces 6H3 W0078 02 00) This water pump repair kit is designed for Yamaha 2 Stroke 40 50 HP (1995 2009) and 4 Stroke 40 60 HP (1995 2009) outboard motors. It provides a reliable solution for maintaining your engine's cooling system for optimal performance and longevity. This kit is a direct replacement for Yamaha part numbers 6H3 W0078 02 00, 6H3 W0078 01 00, 63D W0078 01, and Sierra
Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 6H3-W0078-02-00)
This water pump repair kit is designed for Yamaha 2-Stroke 40-50 HP (1995-2009) and 4-Stroke 40-60 HP (1995-2009) outboard motors. It provides a reliable solution for maintaining your engine's cooling system for optimal performance and longevity.
This kit is a direct replacement for Yamaha part numbers 6H3-W0078-02-00, 6H3-W0078-01-00, 63D-W0078-01, and Sierra part numbers 18-3434 and 18-3415.
- Includes a complete set of gaskets, plates, and a high-performance impeller for a full service.
- Engineered as a direct-fit replacement for the original components.
- Restores cooling system efficiency to prevent engine overheating.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6H3-W0078-02-00 |
| Yamaha | 6H3-W0078-01-00 |
| Yamaha | 63D-W0078-01 |
| Sierra | 18-3434 |
| Sierra | 18-3415 |
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.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Various | 40 | 2-Stroke | 1995-2005 | 6H3-W0078-02-00 | |
| Yamaha | Various | 50 | 2-Stroke | 1998-2009 | 6H3-W0078-02-00 | |
| Yamaha | Various | 40 | 4-Stroke | 1998 | 63D-W0078-01 | Alternative part |
| Yamaha | Various | 50 | 4-Stroke | 1995-2009 | 63D-W0078-01 | Alternative part |
| Yamaha | Various | 60 | 4-Stroke | 2002-2009 | 63D-W0078-01 | Alternative part |
| Yamaha | T50 | 50 | 4-Stroke | 2006+ | 6H3-W0078-02-00 | High Thrust model |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Repair Kit |
| Installation | Direct Replacement |
| Other Technical Attributes | Includes complete water pump service components |
Package Contents
- 1 x Cartridge Insert (663-44322-00-00)
- 1 x Impeller (6H3-44352-00-00)
- 1 x Water Pump Gasket 1 (6H3-44315-A0-00)
- 1 x Cartridge Outer Plate (6H3-44323-00-00)
- 1 x Cartridge Gasket (6H3-44324-A0-00)
- 1 x Water Pump Gasket 2 (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)
Installation Guide
- Disconnect the battery and ensure the engine is securely turned off.
- Remove the lower unit (gearcase) from the outboard motor by unbolting it from the engine leg.
- Unbolt and carefully lift the old water pump housing off the driveshaft.
- Remove the old impeller, Woodruff key, wear plate, and gaskets. Take note of their orientation.
- Thoroughly clean all mating surfaces, ensuring no old gasket material or debris remains.
- Install the new gaskets, wear plate, and cartridge insert from the kit.
- Slide the new Woodruff key into the slot on the driveshaft.
- Install the new impeller, turning the driveshaft clockwise to help seat the vanes correctly inside the housing.
- Place the new outer plate and gasket over the impeller.
- Secure the pump housing with the new bolts provided, tightening them to the manufacturer's specified torque.
- Reinstall the lower unit onto the outboard, ensuring the driveshaft and water tube align correctly.
- Reconnect the battery and test the engine using a water supply (flushing muffs) to confirm proper water flow from the telltale outlet.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my specific Yamaha engine model?
A: Check your engine's model, horsepower, and year against our compatibility table. For precise verification, consult the Yamaha Serial Number Guide linked above or cross-reference your existing part number with our list. This ensures you order the correct component for a successful repair.
Q: What are the signs of a failing water pump impeller?
A: The most common signs include the engine overheating, a weak or non-existent water stream from the "telltale" indicator, or a burnt rubber smell. Upon inspection, a failing impeller may appear brittle, cracked, or have missing vanes.
Q: How often should the water pump impeller be replaced?
A: As a crucial part of preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or 100-200 hours of use. Frequent operation in saltwater or sandy/silty conditions may require more frequent replacement.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy