Water Pump Repair Kit Without Housing – Yamaha 2-Stroke 60-70 HP and 4-Stroke F50/T50/T60 – OEM 6H3-W0078-02
Water Pump Repair Kit Without Housing – Yamaha 2-Stroke 60-70 HP and 4-Stroke F50/T50/T60 – OEM 6H3-W0078-02 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit Without Housing – Yamaha 2-Stroke 60-70 HP an...
Water Pump Repair Kit Without Housing – Yamaha 2-Stroke 60-70 HP and 4-Stroke F50/T50/T60 – OEM 6H3-W0078-02 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit Without Housing is designed to service the cooling system on selected Yamaha outboard motors. The kit replaces the water pump service components associated with Yamaha OEM part number 6H3-W0078-02 and is supplied without the water pump housing.
It is intended for selected Yamaha 2-stroke 60-70 HP models and selected 4-stroke F50, T50, and T60 models. Because Yamaha fitment varies by model and year, confirm your complete engine model and the original water pump part number before ordering.
- Water pump service kit supplied without the pump housing.
- Includes an impeller, gaskets, plates, insert, O-ring, key, and installation hardware as listed below.
- Helps restore water-pump performance during routine cooling-system service.
- Aftermarket replacement for the listed Yamaha OEM reference.
Part Number Reference
Use the following reference to compare this service kit with the part required for your engine.
| Brand | Reference | Description |
|---|---|---|
| Yamaha | 6H3-W0078-02 | Water pump repair kit reference |
Engine & Model Compatibility
The company fitment records identify the following Yamaha applications. Model, horsepower, stroke, and year conditions should be considered together.
| Brand | Model or Model Family | Rated HP | Stroke | Years | Fitment Notes |
|---|---|---|---|---|---|
| Yamaha | 60, C60, P60, 70, C70 | 60-70 | 2-Stroke | 1997-2003 | Confirm the exact model designation before installation. |
| Yamaha | C60, E60, P60, 70 | 60-70 | 2-Stroke | 1992-1996 | Confirm the exact model designation before installation. |
| Yamaha | F50, T50 | 50 | 4-Stroke | 1996 | Verify the original water pump reference. |
| Yamaha | T50, T60 | 50-60 | 4-Stroke | 1997-2023 | Verify the exact model and year before ordering. |
Technical Specifications
- Product Type
- Water pump repair service kit
- Housing
- Not included; supplied without the water pump housing
- Primary OEM Reference
- 6H3-W0078-02
- Installation
- Replacement service part; installation requires removal and servicing of the water pump assembly
- Application
- Selected Yamaha 2-stroke 60-70 HP and 4-stroke F50/T50/T60 outboards listed in the compatibility table
What’s in the Box
- 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 Bolts with Washer (90119-08M14-00)
- 2 x Bolts with Washer (90119-08M33-00)
- 1 x Woodruff Key (90280-03M03-00)
- Water pump housing is not included.
Installation Notes
- Disconnect the battery and make sure the engine is secure before beginning work.
- Shift the outboard into neutral and remove the lower-unit mounting hardware according to the engine service procedure.
- Carefully separate the lower unit from the driveshaft housing.
- Remove the water pump cover and expose the existing impeller and service components.
- Remove the old impeller, gaskets, plates, insert, O-ring, and key as applicable. Note the orientation of each part during disassembly.
- Clean all mating surfaces thoroughly and remove old gasket material, corrosion, and debris.
- Install the replacement plates, gaskets, insert, O-ring, and other kit components in the correct order for your engine.
- Fit the new impeller onto the driveshaft and align it with the Woodruff key. Follow the engine manufacturer’s specified vane direction.
- Reinstall the water pump cover and tighten the fasteners to the manufacturer’s specified torque.
- Reattach the lower unit, reconnect the battery, and test the engine in water. Confirm a strong cooling-water tell-tale stream before normal operation.
Important: This is a service kit without a pump housing. Reuse your existing housing only if it is suitable for continued service; replace it separately if it is worn, damaged, or out of specification.
Troubleshooting & FAQ
How do I confirm that this kit fits my Yamaha outboard?
Compare your complete Yamaha model designation, horsepower, stroke type, and year with the compatibility table. Also verify that your original water pump service part corresponds to OEM reference 6H3-W0078-02. A horsepower match alone is not sufficient.
Does this kit include the water pump housing?
No. This product is a water pump repair kit supplied without the water pump housing. The existing housing must be reused only if it remains serviceable, or replaced separately when necessary.
What are the signs of a failing water pump impeller?
Common signs include overheating, a weak or intermittent tell-tale stream, reduced cooling-water flow, or a visibly cracked, brittle, deformed, or damaged impeller.
How often should an outboard water pump impeller be replaced?
Replacement intervals depend on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the impeller regularly and consider more frequent service in saltwater, sandy, silty, or debris-filled environments.
Why might the engine still overheat after installation?
Check for blocked intake screens or cooling passages, a damaged or unsuitable pump housing, incorrect gasket placement, a damaged key, thermostat problems, or improper installation. If the problem continues, stop operating the engine and consult the service manual or a qualified marine technician.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement service kit identified for comparison with Yamaha OEM reference 6H3-W0078-02. Yamaha is a trademark of its respective owner and is used only to describe compatibility.
What should I check before ordering?
Check the exact engine model, year, horsepower, stroke type, and original pump reference. Confirm that the kit’s no-housing configuration matches your repair plan.
Safety & Important Information
- Disconnect the battery and follow the engine manufacturer’s service procedures before beginning work.
- Never operate an outboard with inadequate cooling-water flow.
- Verify the engine model, year, stroke type, and OEM reference before purchase.
- Professional installation is recommended if you are not experienced with lower-unit or water-pump service.
- This listing is for a repair kit without the water pump housing; the housing is not included.
- This is an aftermarket replacement, not an OEM Yamaha component.
About Sea Sierra
- Marine replacement parts selected for practical maintenance and repair applications.
- Clear compatibility information to help match the part to the correct engine application.
- Manufacturer-direct value for routine outboard service needs.
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