Yamaha 9.9HP/15HP Water Pump Repair Kit Without Housing – 2-Stroke and F9.9/T9.9/F15 4-Stroke
Yamaha 9.9HP/15HP Water Pump Repair Kit Without Housing – 2-Stroke and F9.9/T9.9/F15 4-Stroke is backordered and will ship as soon as it is back in stock.
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Yamaha 9.9HP/15HP Water Pump Repair Kit Without Housing – 2-Stroke ...
Yamaha 9.9HP/15HP Water Pump Repair Kit Without Housing – 2-Stroke and F9.9/T9.9/F15 4-Stroke is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit Without Housing is designed for selected Yamaha 9.9HP and 15HP two-stroke outboard engines, as well as selected F9.9, T9.9, and F15 four-stroke models. It provides the service components needed to renew the water pump assembly while reusing the existing water pump housing.
The company catalog identifies this product with Yamaha OEM reference 63V-W0078-00. Related catalog references may use different suffix formats, so confirm the complete engine model and existing water-pump configuration before ordering.
- Water pump service kit for the lower unit or gearcase.
- Without water pump housing: the existing housing is reused and is not included.
- Includes service components such as the impeller, wear plate, insert cup, key, water seal, and bolts.
- Aftermarket replacement part; Yamaha is referenced for compatibility identification only.
Part Number References
Use the references below together with your engine model and year. Number references are provided for identification and should not be treated as universal interchange claims without confirming the complete application.
| Brand or Source | Reference | Application or Description |
|---|---|---|
| Yamaha | 63V-W0078-00 | Company catalog reference for this water pump service kit. |
| Sierra | 18-3433 | Catalog reference for a Yamaha water pump kit without housing; verify the complete engine application. |
| Yamaha catalog component references | 63V-44352-01-00; 63V-44323-00-00; 63V-44338-00-00; 63V-44322-00-00; 647-44366-00-00 | Component references associated with the listed water pump service application. |
Engine and Model Compatibility
Fitment depends on the exact engine model, stroke type, year, and water-pump design. The company catalog lists the following application scope:
| Brand | Engine Models | Rated Horsepower | Stroke | Year or Scope | Housing |
|---|---|---|---|---|---|
| Yamaha | 9.9 and 15 | 9.9HP and 15HP | 2-Stroke | 1996–2023, subject to exact model verification | Not included; reuse the existing housing |
| Yamaha | F9.9-2, T9.9-2, F15 | 9.9HP and 15HP | 4-Stroke | Confirm the exact model and year before ordering | Not included; reuse the existing housing |
Catalog application data also associates the related water-pump configuration with Yamaha 9.9/15 two-stroke models from the 1996–2004 period and selected F15 four-stroke models from 1998–2004. The company listing expands the two-stroke scope through 2023, so the company fitment statement takes priority; verify the exact model designation for later engines.
Technical Specifications
- Product Type
- Water pump repair kit
- Housing
- Without water pump housing
- Installation Location
- Lower unit or gearcase
- Fitment
- Selected Yamaha 9.9HP and 15HP outboards
- Stroke Coverage
- 2-Stroke; selected 4-Stroke F9.9, T9.9, and F15 models
- OEM Reference
- 63V-W0078-00
- Fitting Type
- Replacement service kit for the existing pump housing
What’s in the Box
The kit is supplied without the water pump housing. Component packaging may identify individual parts by their manufacturer reference.
- 1 x Water pump impeller
- 1 x Wear plate
- 1 x Insert cup
- 1 x Impeller key
- 1 x Water seal
- Water pump service bolts as supplied for the applicable configuration
Important: the water pump housing is not included. Inspect the original housing for scoring, cracking, melting, or excessive wear and replace it separately if necessary.
Installation Notes
- Confirm the engine model, year, stroke type, and existing water-pump arrangement before beginning work.
- Disconnect the battery and remove the spark plug leads following the engine manufacturer’s safety procedure.
- Place the outboard in neutral and remove the lower unit according to the service manual.
- Remove the water pump cover and carefully note the orientation of the impeller, key, wear plate, and insert cup.
- Remove the old service components and inspect the existing housing. This kit does not include a replacement housing.
- Clean the mating surfaces and remove old gasket or seal material without damaging the pump base.
- Install the new components in the correct order. Seat the impeller key securely and use a suitable lubricant during assembly.
- Rotate the driveshaft in the specified direction while fitting the impeller and pump cover, following the service manual.
- Tighten fasteners to the manufacturer’s specified torque.
- Reinstall the lower unit, aligning the water tube and shift mechanism correctly.
- Run the engine only with an appropriate water supply and confirm a strong cooling-water telltale stream before normal operation.
Troubleshooting and FAQ
Does this kit include the water pump housing?
No. This is the without-housing version. It is intended to service the pump using the existing housing when that housing is still within serviceable condition.
How do I confirm that this kit fits my engine?
Match the exact engine model, horsepower, stroke type, and year with the compatibility information above. Do not rely on horsepower alone. If your engine has a different pump housing or component arrangement, use the applicable service manual and parts diagram to confirm the match.
What are the signs of a worn water pump?
Common signs include overheating, a weak or absent telltale stream, reduced cooling-water flow, or visible cracking and distortion of the old impeller. A damaged pump housing can also cause poor performance even after the impeller is replaced.
Can I install the kit without replacing the housing?
Yes, when the existing housing is smooth, undamaged, and within the manufacturer’s service limits. Replace the housing separately if it is scored, cracked, melted, or excessively worn.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement service kit. Yamaha names and reference numbers are used only to identify the intended engine application and related part references.
Safety and Important Information
- Verify the complete engine model and application before ordering.
- Do not operate an outboard without an adequate cooling-water supply.
- Follow the engine manufacturer’s service procedures and torque specifications.
- Professional installation is recommended if you are not experienced with lower-unit or water-pump service.
- This listing is for a water pump repair kit without housing; the housing must be reused or purchased separately.
About Sea Sierra
- Marine Replacement Parts — Practical service components for common outboard maintenance jobs.
- Application-Focused Listings — Compatibility information is organized by engine model, horsepower, stroke type, and year where available.
- Service-Ready Support — Check the original component and engine identification before installation.
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