Yamaha Water Pump Repair Kit Without Housing – 2-Stroke 60–70 HP and 4-Stroke F50/T50/T60 Outboards – Replaces 6H3-W0078-02
Yamaha Water Pump Repair Kit Without Housing – 2-Stroke 60–70 HP and 4-Stroke F50/T50/T60 Outboards – Replaces 6H3-W0078-02 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Yamaha Water Pump Repair Kit Without Housing – 2-Stroke 60–70 HP an...
Yamaha Water Pump Repair Kit Without Housing – 2-Stroke 60–70 HP and 4-Stroke F50/T50/T60 Outboards – Replaces 6H3-W0078-02 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Yamaha water pump repair kit is supplied without the water pump housing. It is intended to service the lower-unit cooling-water pump on specified Yamaha 2-stroke 60–70 HP outboards and specified 4-stroke F50, T50, and T60 models.
The kit replaces Yamaha OEM reference 6H3-W0078-02. Related Yamaha references may use an extended suffix such as 6H3-W0078-02-00; always compare the complete pump configuration and engine identification before ordering.
- Service-kit configuration without a water pump housing.
- Renews the impeller, gaskets, wear and insert components, key, and associated fasteners listed below.
- Designed for restoring water-pump service components in the Yamaha lower unit when the existing housing is reusable.
- Aftermarket replacement; Yamaha is the engine brand and reference-number owner.
Part Number References
Use the following manufacturer reference to compare with the part removed from your engine. Reference numbers are provided for identification and fitment checking only.
| Brand | Reference | Application |
|---|---|---|
| Yamaha | 6H3-W0078-02 | Water pump repair kit reference |
| Yamaha | 6H3-W0078-02-00 | Extended-format reference found in engine and aftermarket catalogs |
Engine & Model Compatibility
Compatibility depends on engine type, model family, and model year. Keep the horsepower, stroke, model, and year conditions together when checking fitment.
| Brand | Stroke | Model or Model Family | Rated HP | Years | Fitment Notes |
|---|---|---|---|---|---|
| Yamaha | 2-Stroke | 60, C60, P60, 70, C70 | 60–70 HP | 1997–2003 | Company-listed 2-stroke applications |
| Yamaha | 2-Stroke | C60, E60, P60, 70 | 60–70 HP | 1992–1996 | Company-listed earlier 2-stroke applications |
| Yamaha | 4-Stroke | F50, T50 | 50 HP | 1996 | Company-listed 4-stroke application |
| Yamaha | 4-Stroke | T50, T60 | 50–60 HP | 1997–2023 | Company-listed 4-stroke applications |
Important: Do not rely on horsepower alone. Confirm the complete model designation, stroke type, model year, and the original pump components before installation.
Technical Specifications
- Product Type
- Water pump repair/service kit
- Housing Configuration
- Without water pump housing
- Engine Brand
- Yamaha outboard
- Supported Stroke Types
- Specified 2-stroke and 4-stroke applications listed above
- Installation
- Replacement service parts for the existing lower-unit water pump assembly
What's in the Box
This service kit does not include the water pump housing. The listed replacement components are:
- 1 x Cartridge insert (663-44322-00-00)
- 1 x Impeller (6H3-44352-00-00)
- 1 x Water pump gasket 1 (6H3-44315-A0-00)
- 1 x Cartridge outer plate (6H3-44323-00-00)
- 1 x Cartridge gasket (6H3-44324-A0-00)
- 1 x Water pump gasket 2 (688-44316-A0-00)
- 1 x O-ring (93210-46044-00)
- 2 x Bolt with washer (90119-08M14-00)
- 2 x Bolt with washer (90119-08M33-00)
- 1 x Woodruff key (90280-03M03-00)
Installation Notes
- Confirm the engine model, year, stroke type, and existing pump configuration before beginning work.
- Disconnect the battery leads where applicable, place the engine in neutral, and secure the outboard safely.
- Place a drain pan under the lower unit and remove the appropriate gearcase drain screw if gearcase oil service is required.
- Remove the lower unit according to the engine manufacturer's service procedure.
- Remove the existing water-pump cover and inspect the housing. This kit is supplied without a housing, so the original housing must be reusable or replaced separately.
- Remove the old impeller, gaskets, wear or plate components, insert, key, and related hardware.
- Clean all mating surfaces and inspect for corrosion, scoring, distortion, or debris before fitting replacement parts.
- Install the new key, impeller, insert, plates, gaskets, O-ring, and fasteners in the correct order for the specific engine.
- Use suitable marine lubricant during assembly where specified by the service manual. Do not substitute sealants or lubricants that are incompatible with the pump materials.
- Torque fasteners to the engine manufacturer's specified values. Reinstall the lower unit, complete any required gearcase-oil service, and test the cooling-water flow using an appropriate water supply.
Professional installation is recommended. Always follow the service manual for the exact engine model and year.
Troubleshooting & FAQ
Does this kit include the water pump housing?
No. This product is the water pump service-kit configuration supplied without the water pump housing. The existing housing must be inspected and reusable, or a suitable housing must be purchased separately.
Which Yamaha engines does this kit fit?
The company fitment data lists specified Yamaha 2-stroke 60, C60, P60, 70, and C70 applications from 1997–2003; C60, E60, P60, and 70 applications from 1992–1996; 4-stroke F50 and T50 applications for 1996; and 4-stroke T50 and T60 applications from 1997–2023. Confirm the complete model and year before ordering.
What are common signs of a worn water-pump service assembly?
Symptoms can include a weak or intermittent telltale stream, an overheating warning, steam, or reduced cooling performance. A blocked passage, thermostat problem, damaged housing, or other cooling-system fault can produce similar symptoms.
How often should the impeller be serviced?
Service intervals depend on the engine manufacturer's schedule and operating conditions. Inspect the impeller regularly and replace it when worn, damaged, deformed, or due under the applicable maintenance schedule. Salt, sand, and dirty water can increase service needs.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement kit intended for the listed Yamaha applications. Yamaha names and reference numbers are used only to identify the applicable engine and replacement reference.
What should I do if the engine still overheats after installation?
Stop operation and verify impeller orientation, gasket placement, key installation, fastener torque, water supply, and housing condition. If the problem remains, inspect cooling passages, the thermostat, temperature-sensing components, and other parts of the cooling system.
Safety & Important Information
- Verify the complete engine model, model year, horsepower, stroke type, and pump configuration before purchase.
- Compare the original components and housing configuration with the supplied kit.
- This product is supplied without the water pump housing.
- Do not operate an outboard with inadequate cooling-water flow or an unresolved overheating condition.
- Professional installation is recommended for safe and reliable service.
About Sea Sierra
- Marine Replacement Parts — Service components for selected outboard maintenance and repair applications.
- Application-Focused Listings — Product information is organized around engine model, year, horsepower, and stroke conditions.
- Customer Support — Contact support with your complete engine model and year when you need help confirming an application.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
