Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke (1994-2005) & F40/F50/F60 4-Stroke (1996+) (Replaces 63D-W0078-01-00)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller Kit
$74.99
$74.99
Subtotal: $74.99

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Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke (1994-2005) & F40/F50/F60 4-Stroke (1996+) (Replaces 63D-W0078-01-00)

$74.99
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited
Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2 - Stroke (1994 - 2005) & F40/F50/F60 4 - Stroke (1996+) (Replaces 63D - W0078 - 01 - 00) - JLM Marine Boat Parts Limited

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke (1994-2005) & F40/F50/F60 4-Stroke (1996+) (Replaces 63D-W0078-01-00)

$74.99
Description

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke & F40/F50/F60 4-Stroke

This water pump impeller repair kit is designed for a wide range of Yamaha outboard engines, including Yamaha 2-Stroke 40/50 HP (1994–2005) models such as the C40, P40, C50, and P50 series. It also fits Yamaha 4-Stroke F40 (1999), F50 (1997 and newer), and F60 (2002 and newer) outboard engines.

It serves as a direct replacement for Yamaha OEM part numbers 63D-W0078-01-00, 63D-W0078-03-00, 63D-W0078-02-00, and 63D-W0078-00-00, ensuring a precise fit and restoring cooling system performance. This kit provides all the necessary components for a complete and professional water pump service.

  • Comprehensive Kit: Includes impeller, housing, gaskets, plate, and hardware for a full overhaul.
  • Direct Replacement: Engineered to meet OEM specifications for a direct, hassle-free installation.
  • Quality Manufacturing: Produced in an ISO9002-certified facility to ensure reliability and durability.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number Notes
Yamaha 63D-W0078-01-00 Supersedes 63D-W0078-00-00, 63D-W0078-02-00, 63D-W0078-03-00
Sierra 18-3415 / 18-3434 Aftermarket replacement
GLM 12276 Aftermarket replacement

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.

Yamaha 2-Stroke Models

Brand Model Rated HP Stroke Years OEM Part No.
Yamaha 40 40 2-Stroke 1995-2005 63D-W0078-01-00
Yamaha C40 40 2-Stroke 1997-2003 63D-W0078-01-00
Yamaha P40 40 2-Stroke 1998 63D-W0078-01-00
Yamaha 50 50 2-Stroke 1998-2009 63D-W0078-01-00
Yamaha C50 50 2-Stroke 1998-2001 63D-W0078-01-00
Yamaha P50 50 2-Stroke 1995-1996 63D-W0078-01-00
Yamaha 40EJRV 40 2-Stroke 1997 63D-W0078-01-00
Yamaha 40EJRW 40 2-Stroke 1998 63D-W0078-01-00
Yamaha 40EJRX 40 2-Stroke 1999 63D-W0078-01-00
Yamaha 40ELRV 40 2-Stroke 1997 63D-W0078-01-00
Yamaha 40ELRW 40 2-Stroke 1998 63D-W0078-01-00
Yamaha 40TLRV/40TLRW/40TLRX/40TLRY/40TLRZ 40 2-Stroke 1997-2001 63D-W0078-01-00
Yamaha 40TLRA/40TLRB/40TLRC/40TLRD 40 2-Stroke 2002-2005 63D-W0078-01-00
Yamaha 50TLRA/50TLRB/50TLRC/50TLRD 50 2-Stroke 2002-2005 63D-W0078-01-00
Yamaha T50TLRC/T50TLRV 50 2-Stroke 1997-2004 63D-W0078-01-00

Yamaha 4-Stroke Models

Brand Model Rated HP Stroke Years OEM Part No.
Yamaha F40 40 4-Stroke 1999 63D-W0078-01-00
Yamaha F40TLRX 40 4-Stroke 1999 63D-W0078-01-00
Yamaha F50 50 4-Stroke 1997+ 63D-W0078-01-00
Yamaha F50TLRV/F50TLRW/F50TLRX/F50TLRY/F50TLRZ 50 4-Stroke 1997-2001 63D-W0078-01-00
Yamaha F50TLRA/F50TLRB/F50TLRC/F50TLRD 50 4-Stroke 2002-2005 63D-W0078-01-00
Yamaha F50LA/F50LB 50 4-Stroke 2011-2016 63D-W0078-01-00
Yamaha F60 60 4-Stroke 2002+ 63D-W0078-01-00
Yamaha F60TLRA/F60TLRB/F60TLRC/F60TLRD 60 4-Stroke 2002-2005 63D-W0078-01-00
Yamaha F60JB/F60LA/F60LB 60 4-Stroke 2011-2016 63D-W0078-01-00
Yamaha F60TJR series 60 4-Stroke 2003-2007 63D-W0078-01-00

Technical Specifications

Specification Value
Other Technical Attributes ISO9002 certified factory production (JLM Marine)

Package Contents

  • 1 x Cartridge Insert (63D-44322-00-00)
  • 1 x Impeller (6H3-44352-00-00)
  • 1 x Water Pump Housing Cover (63D-44312-00-00)
  • 1 x Cartridge Outer Plate (63D-44323-00-00)
  • 1 x O-Ring (93210-59MG7-00)
  • 1 x Water Pump Gasket (63D-44316-00-00)
  • 4 x Bolts with Washers (90119-08M15-00)
  • 1 x Water Seal Damper 2 (663-44366-00-00)
  • 1 x Woodruff Key (90280-03024-00)

Installation Guide

  1. Safety First: Disconnect the battery and the spark plug wires before beginning work.
  2. Drain Gearcase Oil: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gearcase oil.
  3. Remove Lower Unit: Unbolt the lower unit (outdrive) from the upper section of the engine. This may require removing a trim tab to access a hidden bolt.
  4. Access the Water Pump: With the lower unit removed, locate and unbolt the water pump housing cover.
  5. Inspect and Replace: Remove the old impeller, gaskets, plates, and seals. Clean all mating surfaces thoroughly, checking for corrosion or wear.
  6. Install New Components: Install the new components from the kit in the reverse order of disassembly. Lightly grease the new impeller and insert it while turning the driveshaft clockwise.
  7. Reassemble: Reinstall the water pump housing, ensuring bolts are torqued to the manufacturer's specification. Reattach the lower unit to the engine and refill the gearcase with fresh oil.
  8. Test Operation: Reconnect the battery and spark plugs. Start the engine using a water source (flushing muffs) and verify a strong, steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

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

A: The best way is to match your engine's model and year to the compatibility tables provided above. We also recommend using the official Yamaha Serial Number Guide and Parts Catalog linked above to cross-reference the OEM part number (63D-W0078-01-00) with your specific engine diagram.

Q: What are the signs my water pump impeller needs replacing?

A: Common indicators of a failing impeller include the engine overheating alarm sounding, a weak or intermittent water stream from the "tell-tale" outlet, or a temperature gauge reading higher than normal. Visual inspection during regular maintenance may also reveal cracked, brittle, or worn impeller vanes.

Q: How often should I replace the impeller?

A: As a general maintenance guideline, we recommend replacing the water pump impeller and gaskets every 1 to 2 years or every 100-200 operating hours, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

Q: Is this an OEM part or an aftermarket part?

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

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

About JLM Marine

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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