Water Pump Repair Kit – Fits Yamaha 9.9/15 HP 2-Stroke Outboards (Replaces 63V-W0078-01-00)
Water Pump Repair Kit – Fits Yamaha 9.9/15 HP 2-Stroke Outboards (Replaces 63V-W0078-01-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit – Fits Yamaha 9.9/15 HP 2-Stroke Outboards (R...
Water Pump Repair Kit – Fits Yamaha 9.9/15 HP 2-Stroke Outboards (Replaces 63V-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit is an aftermarket replacement service kit for selected Yamaha 9.9 HP and 15 HP 2-stroke outboard water-pump applications. Catalog records associate this repair-kit family with Yamaha models including 9.9MSH/MLH/ELH/ES series and 15MSH/MLH/ELH/ES series, depending on model year and configuration.
The kit is associated with Yamaha reference numbers 63V-W0078-01-00 and 63V-W0078-00-00. Listed aftermarket references include Sierra 18-3412 and 18-3433, and GLM 12066. Reference numbers may apply to different model-year applications, so verify the complete engine model and year before ordering.
- Replaces worn water-pump service parts to help restore proper cooling-water circulation.
- Designed for the water-pump repair service; this listing is not a complete water-pump housing assembly.
- For selected Yamaha 9.9 HP and 15 HP 2-stroke outboards only. It is not presented as a general 4-stroke replacement.
Part Number Matrix
Use these references to compare the replacement kit with the part being removed and with your engine service information.
| Brand | Reference | Reference Type |
|---|---|---|
| Yamaha | 63V-W0078-01-00 | OEM reference |
| Yamaha | 63V-W0078-00-00 | OEM reference for selected earlier applications |
| Yamaha | 63V-W0078-02-00 | Catalog cross-reference |
| Sierra | 18-3412 | Aftermarket reference |
| Sierra | 18-3433 | Aftermarket reference |
| GLM | 12066 | Aftermarket reference; cataloged as a kit without housing |
Engine & Model Compatibility
The fitment examples below are based on catalog occurrences for the corresponding water-pump repair-kit references. Model, year, stroke, and configuration must all match.
| Brand | Model Examples | Rated HP | Stroke | Years Shown in Catalog Records | OEM Reference |
|---|---|---|---|---|---|
| Yamaha | 9.9ELHU, 9.9ELRU, 9.9ESHU, 9.9MLHU, 9.9MSHU | 9.9 | 2-Stroke | 1996 | 63V-W0078-00-00 |
| Yamaha | 15ELHU, 15ELRU, 15ESHU, 15MLHU, 15MSHU | 15 | 2-Stroke | 1996 | 63V-W0078-00-00 |
| Yamaha | 9.9ELHV, 9.9ELRV, 9.9ESHV, 9.9MLHV, 9.9MSHV | 9.9 | 2-Stroke | 1997 | 63V-W0078-00-00 |
| Yamaha | 15ELHV, 15ELRV, 15ESHV, 15MLHV, 15MSHV | 15 | 2-Stroke | 1997 | 63V-W0078-00-00 |
| Yamaha | 9.9MLHW, 9.9MSHW, 15MLHW, 15MSHW | 9.9 / 15 | 2-Stroke | 1998 | 63V-W0078-00-00 |
| Yamaha | 9.9MLHX, 9.9MSHX, 15MLHX, 15MSHX | 9.9 / 15 | 2-Stroke | 1999 | 63V-W0078-01-00 |
| Yamaha | 9.9MLHY, 9.9MSHY, 15MLHY, 15MSHY | 9.9 / 15 | 2-Stroke | 2000 | 63V-W0078-01-00 |
| Yamaha | 9.9MSHKZ, 9.9MSHZ, 15MSHKZ, 15MSHZ | 9.9 / 15 | 2-Stroke | 2001 | 63V-W0078-01-00 |
| Yamaha | 9.9MSHA, 15MSHA; 9.9MSHB, 15MSHB | 9.9 / 15 | 2-Stroke | 2002–2003 | 63V-W0078-01-00 |
| Yamaha | 9.9MSHC, 15MSHC; 9.9MSHD, 15MSHD | 9.9 / 15 | 2-Stroke | 2004–2005 | 63V-W0078-01-00 |
| Yamaha | 9.9MSH, 15MSH | 9.9 / 15 | 2-Stroke | 2006–2010 catalog records | 63V-W0078-01-00 |
Technical Specs
- Product Type
- Water pump repair kit
- Application
- Selected Yamaha 9.9 HP and 15 HP 2-stroke outboards
- Installation
- Direct replacement service installation when the engine and reference number match
- Housing
- Repair kit without a complete water-pump housing assembly
- Brand Status
- Aftermarket replacement; not an OEM Yamaha component
What's in the Box
- 1 x Impeller (63V-44352-01-00)
- 1 x Woodruff key (664-44338-00-00)
- 1 x Outer plate (63V-44323-00)
- 4 x Bolts (97095-08045-00)
- 1 x Cartridge insert (63V-44322-00)
- 1 x Water-seal damper (647-44366-00-00)
- 1 x O-ring (93210-44704)
Component appearance and supplied hardware may vary by production batch. Confirm the parts shown against the water-pump components removed from your engine before installation.
Installation Notes
- Disconnect the battery, place the engine in neutral, and position a drain pan under the lower unit.
- Remove the fasteners securing the lower unit and carefully lower the gearcase.
- Remove the water-pump cover and expose the existing impeller and service components.
- Record the existing impeller-vane direction, then remove the old impeller, key, plate, seal, and gaskets as applicable.
- Clean all mating surfaces and remove old gasket material, corrosion, and debris.
- Install the replacement seal, key, plate, insert, impeller, and supplied service components in the correct order.
- Turn the driveshaft in the manufacturer-specified direction while seating the impeller vanes in the pump insert.
- Reinstall the pump cover and tighten fasteners to the torque specified in the applicable Yamaha service manual.
- Reattach the lower unit, ensuring that the driveshaft and water tube are correctly aligned.
- Run the engine with a suitable flush attachment and steady water supply. Confirm a strong, consistent tell-tale stream before returning the engine to service.
Troubleshooting & FAQ
How do I confirm fitment?
Match the complete Yamaha engine model, year, horsepower, and 2-stroke configuration against the compatibility information and compare the old water-pump kit or service parts with the listed references. When information differs, use the engine service manual or consult a qualified marine technician.
Does this kit include a complete water-pump housing?
No. The referenced repair-kit applications are cataloged as kits without a complete housing assembly. Replace the housing separately if it is scored, cracked, or excessively worn.
What are common signs of a worn impeller?
Symptoms may include overheating at idle or low speed, a weak or missing tell-tale stream, reduced cooling-water flow, or brittle, cracked, or deformed impeller vanes.
How often should the impeller be replaced?
Inspect the water-pump components during scheduled service and replace the impeller when it shows wear or damage. Shorter service intervals may be appropriate in saltwater or sandy and silty operating conditions.
Is the included key important?
Yes. The key locks the impeller to the driveshaft so the impeller rotates with the shaft. Install it correctly and do not operate the pump without the key.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement kit. Yamaha and other brand names and part numbers are used only to identify application and reference compatibility.
Safety & Important Information
- Verify the complete engine model, year, horsepower, stroke, and service-part reference before purchase.
- Do not use this listing as confirmation for Yamaha 4-stroke engines or for an engine outside the listed model and year conditions.
- Inspect the pump housing, driveshaft, water tube, and mating surfaces before reassembly.
- Use the applicable service manual for torque values and detailed lower-unit procedures. Professional installation is recommended when required.
- This is an aftermarket replacement, not an OEM Yamaha component.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine outboard maintenance and repair.
- Application-Focused Listings — Compatibility information is organized around engine model, year, horsepower, and stroke conditions.
- Service Support — Check the part references and contact support if you need help comparing the kit with your original water-pump components.
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