Water Pump Impeller Repair Kit – Fits Yamaha Outboard 4–5 HP (Replaces 68D-WG078-00-00, 6E0-W0078-A2-00)
Water Pump Impeller Repair Kit – Fits Yamaha Outboard 4–5 HP (Replaces 68D-WG078-00-00, 6E0-W0078-A2-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit – Fits Yamaha Outboard 4–5 HP (Repla...
Water Pump Impeller Repair Kit – Fits Yamaha Outboard 4–5 HP (Replaces 68D-WG078-00-00, 6E0-W0078-A2-00) is backordered and will ship as soon as it is back in stock.
Product Details
This complete water pump impeller repair kit is designed for servicing the internal water pump assembly on listed Yamaha 4–5 HP outboards and selected Mariner 4–5 HP two-stroke applications. The kit combines the impeller, housing, wear components, gaskets, seal, dowel pins, and mounting bolts needed for a comprehensive water pump service.
The listed replacement references include Yamaha OEM part numbers 68D-WG078-00-00, 6E0-W0078-00, 6E0-W0078-A2-00, 6E0-W0078-A3-00, 6E0-W0078-A4-00, and 6E0-W0078-A5-00. It is also listed as an interchange for MARKGOO 68D-WG078-00-00.
- Application: Internal lower-unit water pump assembly on the listed compatible outboards.
- Service coverage: Includes the principal wear and sealing components used during a water pump overhaul.
- Construction: Includes a metal-alloy housing and neoprene rubber impeller for marine cooling-system service.
- Fitment requirement: Confirm the exact model, year, horsepower, stroke, and serial-number condition before ordering.
Part Number Matrix
Use the following references to compare the replacement kit with the applicable manufacturer and aftermarket numbers.
| Brand | Part Number |
|---|---|
| Yamaha | 68D-WG078-00-00 |
| Yamaha | 6E0-W0078-00 |
| Yamaha | 6E0-W0078-A2-00 |
| Yamaha | 6E0-W0078-A3-00 |
| Yamaha | 6E0-W0078-A4-00 |
| Yamaha | 6E0-W0078-A5-00 |
| MARKGOO | 68D-WG078-00-00 |
Engine & Model Compatibility
The applications below reflect the listed fitment scope for this repair kit. Model names, production ranges, and serial-number designations can vary by market, so compare the identification plate and the original water pump components before purchase.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Listed 4 HP models | 4 | 2-Stroke | 1984–1999 | 68D-WG078-00-00 | Confirm the exact model designation before ordering. |
| Yamaha | Listed 5 HP models | 5 | 2-Stroke | 1984–2002 | 68D-WG078-00-00 | Confirm the exact model designation before ordering. |
| Yamaha | F4 | 4 | 4-Stroke | 1999–2001 | 68D-WG078-00-00 | Verify the year and original pump components. |
| Yamaha | F4 | 4 | 4-Stroke | 2002–2008 | 68D-WG078-00-00 | Verify the year and original pump components. |
| Mariner | 4A (6E0) | 4 | 2-Stroke | Not specified | 68D-WG078-00-00 | Listed for serial-number prefix 6E0. |
| Mariner | 5C (6E3) | 5 | 2-Stroke | Not specified | 68D-WG078-00-00 | Listed for serial-number prefix 6E3. |
| Mariner | 96325T | 4 | 2-Stroke | Not specified | 68D-WG078-00-00 | Listed only with serial-number prefix 6E0. |
| Mariner | 96325M | 5 | 2-Stroke | Not specified | 68D-WG078-00-00 | Listed only with serial-number prefix 6E3. |
Technical Specs
- Product Type
- Water pump impeller repair kit with housing
- Installation
- Internal lower-unit water pump assembly
- Housing Material
- Metal alloy
- Package Dimensions
- 114 × 81 × 59 mm (4.49 × 3.19 × 2.32 inches)
- Weight
- 164 g (5.8 ounces)
- Fitting Type
- Internal engine water pump assembly
- Impeller Material
- Neoprene rubber
What’s in the Box
- 1 × Water pump impeller, 6E0-44352-00-00
- 1 × Water pump housing, 68D-G4311-01-00
- 1 × Cartridge insert, 6E0-44322-02-00
- 1 × Outer plate, 6E0-44323-00-00
- 1 × Water pump gasket, 68D-G4315-A0-00
- 2 × Dowel pins, 93604-18080-00
- 1 × Water damper seal, 67D-44366-00-00
- 4 × Bolts, 97095-06045-00
Installation Notes
- Review the engine service information and confirm the correct model, year, stroke, and serial-number requirements.
- Disconnect the battery, if equipped, and remove the engine cover as required for access.
- Drain the gearcase oil from the lower unit if required by the service procedure.
- Remove the fasteners securing the lower unit to the midsection and carefully lower the unit.
- Remove the water pump housing and extract the old impeller, wear components, gasket, and seal.
- Clean all mating surfaces and remove old gasket material without damaging the sealing surfaces.
- Install the replacement components in the reverse order of disassembly. Follow the engine manufacturer’s instructions for impeller-vane orientation.
- Use only the lubricant or sealant specified by the engine service procedure. Do not apply sealant where it is not specified.
- Reinstall the water pump housing and tighten the fasteners to the manufacturer’s specified torque.
- Reattach the lower unit, refill the gearcase with the correct lubricant, and reconnect the battery if applicable.
- Run the engine with an appropriate water supply and verify a steady cooling-water tell-tale stream before normal operation.
Troubleshooting & FAQ
How do I confirm this kit fits my engine?
Compare the engine brand, exact model designation, horsepower, stroke, production year, and—where applicable—the serial-number prefix with the compatibility table. Also compare the original impeller and housing before installation.
What are the signs of a failing water pump impeller?
Common signs include overheating, a weak or missing tell-tale stream, reduced cooling-water flow, or an impeller that is cracked, brittle, deformed, or missing vanes.
How often should the water pump kit be replaced?
Replacement intervals depend on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the impeller regularly and replace it when damaged, hardened, worn, or due according to the service schedule, particularly after extended saltwater use.
Why buy a full kit instead of just the impeller?
A complete kit allows the impeller, housing, wear components, gaskets, seal, and related hardware to be serviced together. Reusing worn pump components may reduce sealing performance or cooling-water flow.
Can I install this kit myself?
Installation requires lower-unit removal and correct reassembly of the cooling-water pump. Experienced owners may perform the work with the proper tools and service information; professional installation is recommended if you are unsure of the procedure.
Is this an OEM part?
No. This is an aftermarket replacement kit. The manufacturer and OEM reference numbers are provided only to help compare the listed application and replacement references.
What should I do if my original parts look different?
Do not force installation or rely on horsepower alone. Stop and compare the exact model, year, stroke, serial-number condition, original part numbers, and component dimensions before proceeding.
Safety & Important Info
- Verify the engine model, year, horsepower, stroke, and applicable serial-number prefix before purchase.
- Compare the replacement components with the original parts before installation.
- Follow the engine manufacturer’s service procedure, torque specifications, lubrication requirements, and cooling-system testing instructions.
- This is an aftermarket replacement component and is not manufactured by Yamaha or Mariner.
- Professional installation is recommended when lower-unit removal or water-pump service is unfamiliar.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine maintenance and repair applications.
- Application-Focused Listings — Product references and compatibility details are provided to help you compare the part with your engine and original component.
- Service-Ready Components — This listing groups the stated water-pump service components into one repair kit.
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