Water Pump Repair Kit Without Housing for Yamaha F70 4-Stroke Outboards – Replaces 6CJ-W0078-01-00
Water Pump Repair Kit Without Housing for Yamaha F70 4-Stroke Outboards – Replaces 6CJ-W0078-01-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit Without Housing for Yamaha F70 4-Stroke Outbo...
Water Pump Repair Kit Without Housing for Yamaha F70 4-Stroke Outboards – Replaces 6CJ-W0078-01-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Repair Kit Without Housing is designed for selected Yamaha F70 four-stroke outboards. It provides the service components needed to refresh the water pump assembly while reusing the existing water-pump housing. The kit is associated with Yamaha OEM reference 6CJ-W0078-01-00.
This product is a water-pump repair kit without the complete housing. Confirm the OEM number, engine model, year, and serial or model-code information before ordering.
- Installation location: Water pump assembly in the lower unit gearcase.
- Service scope: Replacement water-pump wear and sealing components, including the impeller, gaskets, seals, key, and related hardware listed below.
- Housing: The complete water-pump housing is not included.
- Product type: Aftermarket replacement repair kit.
Part Number Matrix
Use the following references to compare the application shown for this repair kit. Part-number references do not replace confirmation against the engine identification label and service information.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 6CJ-W0078-01-00 | Primary OEM reference for the later F70 application |
| Yamaha | 6CJ-W0078-00-00 | Earlier OEM reference found for related F70 water-pump repair-kit applications |
| Sierra | 18-3494 | Catalog reference for a Yamaha F70 water-pump kit without housing; application and contents differ by kit reference |
Engine & Model Compatibility
The confirmed catalog relationship for OEM reference 6CJ-W0078-01-00 is the Yamaha F70LA/F70LA2 four-stroke family shown in later model-year parts catalogs. Because Yamaha applications can vary by year and model code, verify the exact engine identification before installation.
| Brand | Model | Rated HP | Stroke | Catalog Years | OEM Part No. | Application |
|---|---|---|---|---|---|---|
| Yamaha | F70LA | 70 | 4-Stroke | 2021–2023 | 6CJ-W0078-01-00 | Repair Kit 2 / scheduled service parts |
| Yamaha | F70LA2 | 70 | 4-Stroke | 2021–2022 | 6CJ-W0078-01-00 | Repair Kit 2 / scheduled service parts |
Earlier Yamaha F70LA catalogs list the related OEM reference 6CJ-W0078-00-00 for 2010–2015 applications. Do not assume the earlier and later references are interchangeable without matching the complete engine model and service-part listing.
Technical Specs
- Product Type
- Water pump repair kit without housing
- Application
- Selected Yamaha F70 four-stroke outboards
- Installation
- Lower-unit water pump assembly
- Housing Included
- No; reuse the existing water-pump housing if serviceable
- Primary OEM Reference
- 6CJ-W0078-01-00
What’s in the Box
Package contents are intended for the water-pump repair-kit application associated with the reference above. Component part numbers may be supplied as current or superseding versions.
- 1 x Water-pump cartridge insert
- 1 x Water-pump housing cover
- 1 x Water-pump gasket
- 1 x Water-pump gasket for the cartridge or wear plate
- 1 x Water-pump cartridge or wear plate
- 1 x Water-damper seal
- 1 x Impeller
- 1 x Woodruff key
- 2 x Oil seals
- 1 x O-ring
- 2 x Dowel pins
- Water-pump bolts with washers as required by the applicable kit configuration
Important: The complete water-pump housing is not included. Compare the old assembly and the supplied components before beginning work.
Installation Notes
- Disconnect the battery and place the engine in neutral.
- Place a drain pan under the lower unit and drain the gear lubricant according to the manufacturer's procedure.
- Remove the fasteners securing the lower unit to the midsection and carefully separate the lower unit.
- Remove the existing water-pump cover and housing components.
- Remove the old impeller, key, gaskets, seals, and wear components. Record their orientation before removal.
- Clean the driveshaft, water-pump cavity, and all mating surfaces. Remove old gasket material and corrosion without damaging the sealing surfaces.
- Install the new Woodruff key and impeller in the correct orientation.
- Install the supplied gaskets, seals, O-ring, cartridge or wear plate, cover, and related hardware. Reuse the housing only if it is not worn, cracked, or damaged.
- Reinstall the lower unit, ensuring that the driveshaft and shift shaft align correctly.
- Tighten fasteners to the torque values specified in the Yamaha service information for the exact engine model.
- Refill the lower unit with the recommended gear lubricant.
- Run the engine with an appropriate water supply and confirm a strong, continuous tell-tale stream before returning the boat to service.
Troubleshooting & FAQ
Does this kit fit every Yamaha F70?
No. The documented relationship for OEM reference 6CJ-W0078-01-00 is to selected Yamaha F70LA and F70LA2 four-stroke applications, particularly later model years. Match the complete OEM reference and engine identification before ordering.
Does the kit include the complete water-pump housing?
No. This is a repair kit without housing. The existing housing must be reused if it is in serviceable condition.
Is this the same as a complete water-pump kit with housing?
No. A kit with housing includes a replacement housing assembly, while this product is intended to renew the internal water-pump service components without supplying the complete housing.
What are the signs of a failing water pump?
Common symptoms include a weak or intermittent tell-tale stream, an overheating alarm, elevated engine temperature, or visible cracking, brittleness, or deformation of the impeller.
How often should water-pump components be inspected?
Inspect the impeller and water-pump components according to the engine manufacturer's maintenance schedule. Inspection may need to be more frequent when the engine is used in saltwater, muddy water, or sandy conditions.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement repair kit. Yamaha and other manufacturer names and part numbers are used only to identify the intended application and reference numbers.
Safety & Important Info
- Confirm the engine model, year, model code, and OEM reference before ordering.
- Do not install the kit if the supplied components do not match the removed parts or the applicable service information.
- Inspect the existing water-pump housing before reuse; replace it if it is worn, cracked, corroded, or otherwise damaged.
- Use the manufacturer's torque values and service procedures for the exact engine.
- Professional installation is recommended for lower-unit and cooling-system service.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for common marine repair and maintenance applications.
- Application-Focused Cataloging — Product references are organized around engine models, OEM numbers, and service applications to support accurate part selection.
- Service Support — Compare your original component and engine identification information before installation, and contact support if the application details do not match.
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