Water Pump Repair Kit with Housing – Fits Yamaha F25 4-Stroke & C30 2-Stroke (Replaces Yamaha 61N-W0078-11-00)
Water Pump Repair Kit with Housing – Fits Yamaha F25 4-Stroke & C30 2-Stroke (Replaces Yamaha 61N-W0078-11-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit with Housing – Fits Yamaha F25 4-Stroke &...
Water Pump Repair Kit with Housing – Fits Yamaha F25 4-Stroke & C30 2-Stroke (Replaces Yamaha 61N-W0078-11-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit with Housing is designed to service the cooling system of selected Yamaha F25 4-stroke and C30 2-stroke outboard engines. It combines the water pump housing with the impeller, wear and sealing components needed to refresh the pump assembly and help restore reliable cooling-water flow.
The kit is identified for Yamaha outboards using OEM reference 61N-W0078-11-00. Catalog references also identify Sierra 18-3432 as a replacement for this Yamaha water pump kit.
- Complete water pump service kit supplied with the pump housing.
- Includes the primary wear, sealing and fastening components required for pump service.
- Suitable for the specified Yamaha F25 4-stroke and C30 2-stroke applications listed below.
- Helps address cooling-system wear and reduce the risk of overheating caused by a worn water pump assembly.
Part Number References
Use the references below together with your engine model and serial information to confirm application before ordering.
| Brand | Reference | Application or description |
|---|---|---|
| Yamaha | 61N-W0078-11-00 | OEM water pump repair kit reference |
| Sierra | 18-3432 | Replacement water pump kit with housing |
Engine & Model Compatibility
The company application records identify this kit for Yamaha C30 2-stroke outboards from 1993–1997 and Yamaha F25 4-stroke outboards. The F25 application is shown without a universal year range, so verify the exact model designation and serial number before installation.
| Brand | Model | Rated HP | Stroke | Years | OEM reference | Fitment note |
|---|---|---|---|---|---|---|
| Yamaha | F25 | 25 HP | 4-Stroke | Not specified | 61N-W0078-11-00 | Verify the complete model code and serial range. |
| Yamaha | C30 | 30 HP | 2-Stroke | 1993–1997 | 61N-W0078-11-00 | Confirm the model and serial information before ordering. |
Important: Do not use the broader 25–30 HP description alone to determine compatibility. Yamaha model family, stroke, year and serial conditions must match the application of your engine.
Technical Specifications
- Product type
- Water pump repair kit with housing
- Application
- Yamaha outboard cooling systems
- Listed engine applications
- F25 4-stroke and C30 2-stroke outboards
- Installation
- Replacement water pump service assembly
- OEM reference
- 61N-W0078-11-00
What's in the Box
This is a housing-included water pump service kit. The cataloged component group for the applicable Yamaha water pump kit includes:
- 1 x Water pump housing
- 1 x Water pump impeller
- 1 x Wear plate
- 1 x Impeller key
- 1 x Insert cup or cartridge insert
- 1 x Water seal
- 1 x O-ring
- 4 x Bolts
- 4 x Washers or related fastening hardware
Component appearance and minor hardware details may vary by engine application. Compare the supplied parts with the original pump assembly and the service information for your exact engine before installation.
Installation Notes
- Disconnect the battery, place the outboard in a secure position and allow the engine to cool completely.
- Confirm the replacement kit against the engine model, stroke, year and serial information.
- Remove the lower unit according to the manufacturer's service procedure.
- Remove the old water pump housing, impeller, key, wear plate, seals and related hardware.
- Clean the mating surfaces and driveshaft area, removing corrosion and old gasket material without damaging the sealing surfaces.
- Install the supplied wear plate, seals, insert components and housing in the same orientation as the original assembly.
- Fit the impeller key into the driveshaft slot and install the impeller with the vanes oriented according to the service manual.
- Use a suitable marine lubricant during assembly where specified by the manufacturer. Do not apply unapproved sealant to components that are designed to seal dry.
- Reinstall the housing and fasteners using the manufacturer's torque specifications.
- Refit the lower unit, ensuring the driveshaft, shift mechanism and water tube are correctly aligned.
- Run the engine only with an appropriate water supply and confirm a strong cooling-water telltale stream before returning the boat to service.
Maintenance & Troubleshooting
Inspect the water pump periodically and replace the impeller when it shows cracking, brittleness, distortion or damaged vanes. A weak telltale stream, overheating warning, rising operating temperature or visible pump wear can indicate that the water pump requires service.
How do I know if the water pump needs service?
Common signs include a weak or missing telltale stream, overheating, temperature alarms or a visibly worn, cracked or brittle impeller. Always investigate the complete cooling system rather than assuming the impeller is the only cause.
Does this kit include the water pump housing?
Yes. The company product description identifies this product as a water pump service kit with housing.
Does this kit fit Yamaha F25C?
The available application information identifies the F25 family generally and does not expressly confirm F25C. Verify the exact F25C model code and serial range before ordering; do not assume compatibility from horsepower alone.
Does this kit fit every Yamaha C30?
No. The listed C30 application is for Yamaha C30 2-stroke models from 1993–1997. Confirm the exact model and serial information before installation.
Is the impeller key important?
Yes. The key locks the impeller to the driveshaft so the impeller rotates with the shaft and pumps cooling water. Make sure it is correctly seated before installing the impeller.
What torque should be used for the housing bolts?
Torque values depend on the specific Yamaha engine. Use the official service manual for your exact model rather than relying on a general torque value.
Safety & Important Information
- Confirm the exact engine model, stroke, year and serial information before ordering.
- Compare the replacement housing, impeller and fastening points with the original water pump assembly.
- Never run an outboard without an appropriate water supply.
- Professional installation is recommended when lower-unit removal or cooling-system diagnosis is unfamiliar.
- This is a replacement aftermarket service kit and is not represented as a Yamaha-branded factory part.
About Sea Sierra
- Marine replacement parts selected for practical repair and maintenance applications.
- Application-focused product information to help match parts with the correct engine model.
- Support for routine outboard cooling-system service and replacement needs.
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