Yamaha 9.9HP/15HP Water Pump Service Kit Without Housing – 2-Stroke 1996–2023 and Select 4-Stroke Models
Yamaha 9.9HP/15HP Water Pump Service Kit Without Housing – 2-Stroke 1996–2023 and Select 4-Stroke Models is backordered and will ship as soon as it is back in stock.
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Yamaha 9.9HP/15HP Water Pump Service Kit Without Housing – 2-Stroke...
Yamaha 9.9HP/15HP Water Pump Service Kit Without Housing – 2-Stroke 1996–2023 and Select 4-Stroke Models is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump service kit without housing is designed for selected Yamaha 9.9HP and 15HP outboard applications. The company fitment data covers 2-Stroke 9.9HP and 15HP models from 1996 through 2023, plus selected 4-Stroke F9.9-2, T9.9-2, and F15 model families. The kit renews key water-pump service components to help restore cooling-water circulation and support reliable engine operation.
This service kit is supplied without the water-pump housing. Confirm the engine model, stroke, year, and existing pump components before ordering. Model-family fitment does not replace a direct comparison with the engine's parts diagram.
OEM and Interchange References
The primary Yamaha reference recorded for this service kit is 63V-W0078-00. Related references listed in aftermarket catalog and product-mapping records may include the following numbers; use them only together with the application details and package configuration.
| Brand | Reference | Use |
|---|---|---|
| Yamaha | 63V-W0078-00 | Primary reference |
| Yamaha | 63V-W0078-00-00 | Catalog-formatted reference |
| Yamaha | 63V-W0078-01-00 | Related service-kit reference for selected applications |
| Yamaha | 63V-W0078-02-00 | Related catalog reference |
| Yamaha | 63V-W0078-03-00 | Related catalog reference |
| Yamaha | 63V-W0078-04-00 | Related catalog reference |
| Sierra | 18-3412 | Aftermarket cross-reference |
| Sierra | 18-3433 | Aftermarket cross-reference |
| GLM | 12066 | Aftermarket cross-reference |
Engine Compatibility
Keep the horsepower, stroke, model family, and year together when checking fitment. The following scope reflects the available company and catalog data.
| Brand | Model or application | Rated HP | Stroke | Year or scope | Notes |
|---|---|---|---|---|---|
| Yamaha | 9.9HP model family | 9.9 | 2-Stroke | 1996–2023 | Company-listed application range; verify the exact model code. |
| Yamaha | 15HP model family | 15 | 2-Stroke | 1996–2023 | Company-listed application range; verify the exact model code. |
| Yamaha | F9.9-2 | 9.9 | 4-Stroke | Model family listed by company | Year and serial range are not specified in the company record. |
| Yamaha | T9.9-2 | 9.9 | 4-Stroke | Model family listed by company | Year and serial range are not specified in the company record. |
| Yamaha | F15 | 15 | 4-Stroke | Model family listed by company | Year and serial range are not specified in the company record. |
Technical Specifications
- Product type
- Water pump service and repair kit
- Housing configuration
- Without water-pump housing
- Brand application
- Yamaha Outboard
- 2-Stroke fitment
- 9.9HP and 15HP models, 1996–2023
- 4-Stroke fitment
- Selected F9.9-2, T9.9-2, and F15 model families
- Primary OEM reference
- 63V-W0078-00
- Product status
- Aftermarket replacement; not manufactured by Yamaha
What's in the Box
This service-kit configuration is supplied without the water-pump housing. The component list associated with this kit is:
- 1 x Cartridge insert
- 1 x Cartridge outer plate
- 1 x Water-pump impeller
- 1 x Water seal
- 1 x Woodruff key
- 4 x Hex bolts
- 1 x O-ring
Part-number markings and component appearance can vary by production batch. Compare the supplied parts with the original assembly before installation. The water-pump housing is not included.
Installation Notes
- Disconnect the battery where applicable, remove the spark-plug leads, and place the outboard in neutral.
- Support the engine and remove the fasteners securing the lower unit to the midsection.
- Lower the gearcase carefully, keeping the driveshaft, shift shaft, and water tube aligned during removal.
- Remove the water-pump cover or service components and record the order and orientation of the original parts.
- Remove the old impeller, plates, seals, key, and related service components. Do not discard reusable housing parts until the replacement components have been checked.
- Clean the mating surfaces and water passages. Remove old gasket material and debris without damaging sealing surfaces.
- Install the new service components in the correct order. Lightly lubricate the impeller with a suitable lubricant compatible with the manufacturer's instructions.
- Align the Woodruff key and install the impeller on the driveshaft. Rotate the shaft in the correct direction while seating the impeller vanes in the housing.
- Reassemble the pump, ensuring that the O-ring and water seal are correctly seated. Tighten fasteners to the engine manufacturer's specifications.
- Reinstall the lower unit and verify proper engagement of the driveshaft, shift shaft, and water tube.
- Run the engine only with an adequate water supply, then verify a strong tell-tale stream and check carefully for leaks or abnormal temperature.
Consult the appropriate Yamaha service information for disassembly procedures, torque values, sealants, and any model-specific installation requirements.
Troubleshooting & FAQ
How do I confirm that this kit fits my Yamaha outboard?
Match the exact engine model code, horsepower, stroke, and year to the compatibility information above and compare the original water-pump assembly. For 4-Stroke applications, the company record identifies the F9.9-2, T9.9-2, and F15 model families but does not specify year or serial ranges, so verify those details before ordering.
Does this kit include the water-pump housing?
No. This is the service-kit configuration without the water-pump housing. Reuse the original housing only if it is within serviceable condition and matches the replacement components.
What are common signs of a worn impeller?
Typical symptoms include a weak or intermittent tell-tale stream, overheating at idle or low speed, an engine temperature warning, or visible cracks, brittleness, deformation, or missing vanes on the old impeller.
How often should a water-pump impeller be replaced?
Replacement intervals depend on operating hours, storage, water conditions, and manufacturer guidance. Inspect the impeller during scheduled maintenance and replace it sooner after dry running, sand ingestion, saltwater exposure, or any overheating event.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement service kit. Yamaha references are provided for application and cross-reference purposes only.
Can I use the kit if my existing housing is damaged?
No. Because the housing is not included, replace or repair a damaged, deeply scored, warped, or excessively worn housing before returning the engine to service.
Safety & Important Information
- Confirm the exact model, year, stroke, and pump configuration before purchase.
- Do not operate the outboard without an adequate water supply.
- Follow the manufacturer's service procedures and torque specifications.
- Professional installation is recommended if you are not familiar with lower-unit removal or water-pump servicing.
- This listing is for an aftermarket replacement kit and is not affiliated with or endorsed by Yamaha, Sierra, or GLM.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine outboard service and repair.
- Application-Focused Listings — Product references and fitment information are provided to help match the correct service part.
- Support for Maintenance Projects — Use the model details and installation information to prepare for regular cooling-system service.
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