SKU: 94983211450

Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 6H3-W0078-02-00)

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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

  1. Disconnect the battery and ensure the engine is securely turned off.
  2. Remove the lower unit (gearcase) from the outboard motor by unbolting it from the engine leg.
  3. Unbolt and carefully lift the old water pump housing off the driveshaft.
  4. Remove the old impeller, Woodruff key, wear plate, and gaskets. Take note of their orientation.
  5. Thoroughly clean all mating surfaces, ensuring no old gasket material or debris remains.
  6. Install the new gaskets, wear plate, and cartridge insert from the kit.
  7. Slide the new Woodruff key into the slot on the driveshaft.
  8. Install the new impeller, turning the driveshaft clockwise to help seat the vanes correctly inside the housing.
  9. Place the new outer plate and gasket over the impeller.
  10. Secure the pump housing with the new bolts provided, tightening them to the manufacturer's specified torque.
  11. Reinstall the lower unit onto the outboard, ensuring the driveshaft and water tube align correctly.
  12. 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:
  1. 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
SKU: 94983211450

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Freddy Pereira
Cuba, US
★★★★★ 3
A little difficult to read.
Color: GMT Blue
Very good watch, but I would have liked it to be bigger, about 43 mm, a little difficult to read.
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Reviewed in the United States on September 19, 2025
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ross friedman
Houston, US
★★★★★ 5
Funky reissue!
Color: GMT Blue, Color: GMT Blue
Absolutely love this watch! The quality is fantastic as well as the price. Such an attention grabber.
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Reviewed in the United States on May 23, 2024
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Anne
Lake Worth, US
★★★★★ 5
Excellent Watch
Color: Gold Silver-G8408
I don't know why this watch is getting a less than perfect rating from others. I purchased this watch legit to make sure my son got out of the shower at the gym on time to get where he is going. LOL It is classy, elegant and yes, has been exposed to sweat, water and soap extensively, and still looks fantastic. He is getting the black one next.
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Reviewed in the United States on November 27, 2025
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Judi
Lake Worth, US
★★★★★ 5
Easy to read and set.
Easy to read and set, especially for poor eyesight. No complications!
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Reviewed in the United States on March 19, 2026
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J. Westbrook
Lexington, US
★★★★★ 4
looks good but is unreliable; replacement coming
Color: Gold Blue-G8408
Update: The company reached out to me and offered me either a refund or a replacement watch. I bumped my rating up by two stars for that good customer service, and I'll provide another update once I have the replacement and see how it works. This watch looks great, was a good price, and I enjoy wearing it. The problem is that it keeps stopping. An unreliable watch is a big problem. Unfortunately, I was out of the country and didn't get to return it in time before the return window closed. If it worked properly, I would have given it a five-star rating.
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Reviewed in the United States on July 18, 2025

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