SKU: 32951514752

Water Pump Repair Kit – Fits Yamaha 9.9HP & 15HP 4-Stroke Outboard Engines (Replaces 63V-W0078-01-00, 63V-W0078-00-00)

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Description

Water Pump Repair Kit – Fits Yamaha 9.9HP & 15HP 4-Stroke Outboard Engines (Replaces 63V-W0078-01-00, 63V-W0078-00-00)Water Pump Repair Kit Fits Yamaha 9. 9HP & 15HP 4 Stroke Outboard Engines This water pump repair kit is designed for Yamaha 9. 9HP and 15HP 4 Stroke outboard engines from 1996 to present, including F15, F9. 9, and high thrust T9. 9 models. It provides the necessary components to restore your engine's cooling system for optimal performance and reliability. This kit serves as a direct aftermarket replacement for Yamaha OEM parts 63V W0078 01 00 and 63V

Water Pump Repair Kit – Fits Yamaha 9.9HP & 15HP 4-Stroke Outboard Engines

This water pump repair kit is designed for Yamaha 9.9HP and 15HP 4-Stroke outboard engines from 1996 to present, including F15, F9.9, and high-thrust T9.9 models. It provides the necessary components to restore your engine's cooling system for optimal performance and reliability.

This kit serves as a direct aftermarket replacement for Yamaha OEM parts 63V-W0078-01-00 and 63V-W0078-00-00. It also cross-references with Sierra 18-3433, Sierra 18-3412 (with housing), and SeaSierra equivalents.

  • Engineered for a direct replacement fit to restore cooling performance.
  • Available in two versions: a full kit with housing or a basic kit without housing.
  • Restores cooling system function 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 63V-W0078-01-00
Yamaha 63V-W0078-00-00
Sierra 18-3433
Sierra 18-3412 (with housing)
SeaSierra 18-3412
SeaSierra 18-3433

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 F15 15 4-Stroke 1998–2004 63V-W0078-01-00, 63V-W0078-00-00
Yamaha F9.9 9.9 4-Stroke 1996–2004 63V-W0078-01-00, 63V-W0078-00-00
Yamaha F15 15 4-Stroke 2005–Present 63V-W0078-01-00, 63V-W0078-00-00 "2006 and Later" mentioned in sources
Yamaha F9.9 9.9 4-Stroke 2005–Present 63V-W0078-01-00, 63V-W0078-00-00 "2006 and Later" mentioned in sources
Yamaha T9.9 9.9 4-Stroke 1996–Present 63V-W0078-01-00, 63V-W0078-00-00 High thrust models

Technical Specifications

Specification Value
Product Type Water Pump Impeller Repair Kit
Installation Direct OEM replacement
Housing Material Metal/Aluminum (varies by kit version)
Housing Color Silver
Weight 0.270 kg (0.595 lb)
Warranty 1 Year (varies by distributor)
Other Technical Attributes Two versions available: with or without housing

Package Contents

This kit is available in two versions. Please select the correct version for your needs.

Kit With Housing (Replaces Sierra 18-3412):

  • 1 x Impeller (18-3040)
  • 1 x Insert Cup (18-3444)
  • 1 x Water Pump Housing (18-3356)
  • 1 x Impeller Plate (18-3195)
  • 1 x Water Seal Damper (18-1833)
  • 1 x Impeller Key

Kit Without Housing (Replaces Sierra 18-3433):

  • Includes essential components such as the impeller, gaskets, and seals for a repair when the original housing is not damaged. Contents may vary; verify parts against your needs before ordering.

Installation Guide

Professional installation is recommended. The following are general steps and may not be specific to your exact model.

  1. Disconnect the spark plug leads and battery cables for safety.
  2. Drain the gearcase oil from the lower unit.
  3. Unbolt and carefully remove the lower unit (gearcase) from the outboard's midsection.
  4. Place the lower unit on a workbench. Unbolt and remove the old water pump housing.
  5. Note the orientation of the old parts as you remove the impeller, wear plate, and gaskets.
  6. Clean all mating surfaces thoroughly, removing any old gasket material or sealant.
  7. Install the new lower gasket, wear plate, and impeller key.
  8. Install the new impeller. Turn the driveshaft clockwise while pushing down to seat the vanes correctly.
  9. Fit the new insert cup into the housing, and slide the new housing assembly down over the impeller.
  10. Apply a light coat of marine-grade grease or soap to the inside of the housing to help seat the impeller.
  11. Bolt down the new housing to the specified torque.
  12. Reinstall the lower unit, refill with fresh gear lube, and test engine operation in water, ensuring a steady stream from the tell-tale.

Troubleshooting & FAQ

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

A: This kit is specifically for Yamaha 9.9HP and 15HP 4-Stroke models from 1996 to present. Please review the "Compatible Engine Models" table and cross-reference your engine's model and year. The kit replaces OEM part numbers 63V-W0078-01-00 and 63V-W0078-00-00.

Q: What is the difference between the kit with housing and the kit without?

A: The full kit (replaces Sierra 18-3412) includes the metal water pump housing. The basic kit (replaces Sierra 18-3433) does not. You only need the basic kit if your existing housing is in good condition, free of cracks, corrosion, or warping.

Q: How often should I replace my water pump impeller?

A: 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, whichever comes first. Service intervals should be shorter for engines used in saltwater or sandy/silty conditions.

Q: What are the symptoms of a failing water pump?

A: The most common signs include the engine overheating at idle or low speeds, or a weak or non-existent water stream from the "tell-tale" outlet port. A brittle, cracked, or deformed impeller found during an inspection also indicates an immediate need for 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: 32951514752

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Kevin Finn
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★★★★★ 5
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Color: Black
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Reviewed in the United States on May 10, 2026
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Esmeralda
Houston, US
★★★★★ 5
Super Satisfied Customer Here!
Color: Gold, Color: Gold
I purchased the gold/black mug warmer. I always spend a good about of money for great coffee products and I take my time to perfect my coffee for my mornings at work. However, I get pulled into urgent meetings and just something urgent and I always leave more than half of my coffee behind. When I come back it’s cold and that’s very disappointing considering the money and time I spent to make it bc I then have to toss it. I don’t believe in microwaves and I refuse to use one. When I found this, I was super excited! It looks perfect at my desk and it works perfect! I would have liked it to be more on the brass gold like my pen holder, but it’s just as pretty! As you can see, my mug had a layer on the bottom and that made me think it may not work well, but it did the job. My coffee was super warm and it got even hotter as I left it there tearing it. I turned it one before making my coffee, so I’m not sure exactly how long it took to warm up but for me, by the time I got back, it was the peg temperature. I highly recommend this to anyone who has the same struggles. No more cold coffees! Thank you!!!
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Reviewed in the United States on January 21, 2026
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Timothy Mousseau
Lowell, US
★★★★★ 5
Neat gadget
Color: Gold
Neat little gadget. Works great, easy to use and has a light indicator for temperature range. Keeps a cup of liquid hot right to the bottom.
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Reviewed in the United States on May 29, 2026
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Ctg1363
San Leandro, US
★★★★★ 5
My tea stays warm to the bottom of the cup!!!
I am so glad I purchased this mug water. I drink tea all day but it cools down quickly. Since I purchased this mug warmer my tea stays hot to the bottom of the cup. The temperature is adjustable so you can keep your drink at your desired temperature. The top is glass and wipes clean easily. I like the rubber gasket that fits on top of the warmer. It keeps your mug in the center of the warmer and should you have a spill it catches the liquid. I've been using it every day for over a month now and it's going strong and is reliable. Perfect for personal use or as a gift.
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Reviewed in the United States on May 2, 2026
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Sarah Akin
Louisville, US
★★★★★ 5
Keeps my coffee as hot as I want it to be
Color: Silver
This coffee warmer is much better than the candle warmer that I was using for my coffee before. With a range of 3 temperatures, I have a choice of temperatures from hot to very, very hot, and the warmer shuts itself off after a while, just in case I forget. The description advises that ceramic cups do not retain heat as well as flat-bottomed cups, but I have not found that to be a problem. Coffee in my ceramic mug stays as hot as I want it to be. The knob on the side makes this warmer easy to turn on and to select a temperature, plus I feel that it is a good value.
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Reviewed in the United States on February 11, 2026

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