Yamaha Outboard Water Pump Repair Kit – 50–115 HP 2- and 4-Stroke Applications
Yamaha Outboard Water Pump Repair Kit – 50–115 HP 2- and 4-Stroke Applications is backordered and will ship as soon as it is back in stock.
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Yamaha Outboard Water Pump Repair Kit – 50–115 HP 2- and 4-Stroke A...
Yamaha Outboard Water Pump Repair Kit – 50–115 HP 2- and 4-Stroke Applications is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump repair kit is intended for selected Yamaha outboard applications using the water pump assemblies identified by the OEM references below. It is suitable for application-specific 2-stroke and 4-stroke Yamaha models in the approximately 50–115 HP range, including selected T50, T60, 60, 70, F50, F75, F90, F115, and LF115 applications.
The kit is used in the lower unit or gearcase to renew the water pump assembly and help restore proper cooling-water circulation. The correct kit configuration depends on the engine model, year, stroke, and OEM part number. The 2-stroke and 4-stroke configurations are not interchangeable simply because the horsepower is similar.
- Application-specific water pump repair kit for selected Yamaha outboards.
- Designed for installation in the lower unit or gearcase.
- May include the pump housing, impeller, wear plate, insert cup, gaskets, key, O-rings, and related fasteners shown for the applicable configuration.
- Verify the original part number and engine details before ordering.
OEM Reference Numbers
Use the reference number that matches your engine's parts catalog and existing water pump assembly.
| Manufacturer | OEM Part Number | Application Reference |
|---|---|---|
| Yamaha | 6H3-W0078-02-00 | Selected 2-stroke and some 50 HP 4-stroke water pump repair-kit applications |
| Yamaha | 68V-W0078-00-00 | Selected 4-stroke water pump repair-kit applications, including F75, F90, F115, and LF115 families |
| Yamaha | 68V-W0078-01-00 | Superseding or updated reference reported for selected applications; confirm against the engine catalog |
Engine and Model Compatibility
The catalog relationships below are representative application references rather than a substitute for checking the complete model code and serial-number range. Keep the model, year, horsepower, stroke, and OEM number together when confirming fitment.
| Brand | Representative Model | Rated HP | Stroke | Documented Years | OEM Part Number |
|---|---|---|---|---|---|
| Yamaha | 70TLRV / 70TLRW / 70TLRX / 70TLRY / 70TLRZ / 70TLRA / 70TLRB | 70 | 2-Stroke | 1997–2003 | 6H3-W0078-02-00 |
| Yamaha | C60TLRV / C60TLRW / C60TLRX / C60TLRY / C60TLRZ / C60TLRA / C60TLRB | 60 | 2-Stroke | 1997–2003 | 6H3-W0078-02-00 |
| Yamaha | P60TLHV / P60TLHW | 60 | 2-Stroke | 1997–1998 | 6H3-W0078-02-00 |
| Yamaha | T50TLR family | 50 | 2-Stroke | 2005–2010 | 6H3-W0078-02-00 |
| Yamaha | T60TLR family | 60 | 2-Stroke | 2006–2010 | 6H3-W0078-02-00 |
| Brand | Representative Model | Rated HP | Stroke | Documented Years | OEM Part Number |
|---|---|---|---|---|---|
| Yamaha | F50TLHW / F50TLRW / F50TLRX / F50TLRY / F50TLRZ | 50 | 4-Stroke | 1998–2001 | 6H3-W0078-02-00 |
| Yamaha | F50TLRA / F50TJRA / F50TLRB / F50TJRB / F50TLRC | 50 | 4-Stroke | 2002–2004 | 6H3-W0078-02-00 |
| Yamaha | F75 family | 75 | 4-Stroke | Selected catalog applications | 68V-W0078-00-00 |
| Yamaha | F90 family | 90 | 4-Stroke | Selected catalog applications | 68V-W0078-00-00 |
| Yamaha | F115 / LF115 family | 115 | 4-Stroke | 2002–2017 in documented catalog applications | 68V-W0078-00-00 |
Technical Specifications
- Product Type
- Water pump repair kit
- Installation Location
- Lower unit / gearcase
- Application
- Selected Yamaha 2-stroke and 4-stroke outboards
- Application Range
- Approximately 50–115 HP, subject to model and OEM part-number confirmation
- Housing Material
- Nylon PA66 / plastic, where supplied in the applicable configuration
- Impeller Material
- Neoprene / CR-neoprene
- Insert Cup Material
- Stainless steel, where supplied in the applicable configuration
- Wear Plate Material
- Stainless steel, where supplied in the applicable configuration
Application-Specific Kit Contents
Contents vary by the Yamaha application. The following lists identify the components associated with the corresponding repair-kit configurations; they do not mean that both configurations are supplied together.
Selected 2-Stroke configuration associated with Yamaha 6H3-W0078-02-00:
- 1 x Water pump housing
- 1 x Water pump impeller
- 1 x Insert cup
- Water pump gaskets and outer plate gasket
- 1 x Wear plate
- 1 x Impeller key
- 1 x O-ring
- Application-specific bolts and washers
Selected 4-Stroke configuration associated with Yamaha 68V-W0078-00-00:
- 1 x Water pump impeller
- 1 x Water pump housing
- 1 x Insert cup
- 1 x Wear plate
- Application-specific gasket
- Application-specific dowel pins, bolts, and washers
- 1 x Impeller key
- Application-specific O-rings
Before installation, compare the supplied parts with the original assembly and the parts diagram for your exact engine model.
Installation Notes
- Disconnect the battery and place the engine in a safe service position.
- Disconnect or release the shift linkage as required by the engine service procedure.
- Remove the bolts securing the lower unit to the upper casing and carefully lower the gearcase.
- Remove the old water pump housing and note the orientation of the impeller, key, gaskets, cup, and wear plate.
- Clean the mating surfaces and remove old gasket material, corrosion, and debris.
- Install the applicable wear plate, gaskets, insert cup, and other components in the order specified for the engine.
- Install the impeller with the key correctly positioned. Use a suitable lubricant and orient the impeller vanes according to the manufacturer's service procedure.
- Install the housing and tighten the fasteners to the engine manufacturer's specifications.
- Reinstall the lower unit, ensuring correct alignment of the driveshaft, shift shaft, and water tube.
- Reconnect the shift linkage and battery. Run the engine only with an appropriate water supply and verify a steady telltale stream and normal cooling operation.
Maintenance and Troubleshooting FAQ
How do I confirm fitment?
Match the complete engine model, year, horsepower, stroke, and serial-number range to the applicable parts catalog. Most importantly, verify that your original water pump repair-kit number matches 6H3-W0078-02-00 or 68V-W0078-00-00 as applicable. Do not rely on horsepower alone.
What are common signs of a worn water pump impeller?
Symptoms may include overheating at idle or low speed, a weak or missing telltale stream, a temperature alarm, or brittle, cracked, deformed, or melted impeller material.
How often should the impeller be inspected?
Inspect the water pump during scheduled maintenance and replace the impeller according to the engine manufacturer's service interval. More frequent inspection may be appropriate in saltwater, sandy, silty, or debris-filled operating conditions.
Should the housing, cup, and wear plate be replaced?
Inspect these parts for scoring, corrosion, distortion, or heat damage. A damaged housing, cup, or wear plate can reduce pump performance and shorten the life of a new impeller, which is why a complete repair-kit configuration is commonly used.
Are the 2-stroke and 4-stroke configurations interchangeable?
No. The configurations can use different housing designs, component dimensions, gaskets, and reference numbers. Confirm the exact OEM number and engine application before ordering.
Is this an OEM part?
This is an aftermarket replacement kit. Yamaha reference numbers are provided only to identify the intended application and compatibility reference.
Safety and Important Information
- Confirm the complete engine model, year, stroke, horsepower, serial range, and OEM reference number before purchase.
- Check the supplied components against the original water pump assembly before installation.
- Do not operate the engine without an adequate water supply.
- Incorrect water pump installation can cause inadequate cooling, overheating, and engine damage. Professional installation is recommended when the required service procedure is unfamiliar.
- This is an aftermarket replacement product and is not manufactured by Yamaha.
About Sea Sierra
- Marine Replacement Parts — We provide application-focused replacement components for routine marine maintenance and repair.
- Fitment-Focused Listings — Product references are organized around engine models, OEM numbers, and service applications.
- Practical Service Support — Always compare the original part and the engine parts diagram before installation.
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