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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Delivery and Shipping
Delivery and Shipping
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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 – Fits Yamaha Outboard 4-5 HP provides everything needed for a full water pump service. It is designed for specific Yamaha 4-5 HP 2-Stroke (1984–2002) and F4 4-Stroke (1999–2008) outboards, as well as select Mariner 4-5 HP 2-Stroke models with serial numbers 6E0 and 6E3.
This kit serves as a direct replacement for 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 also interchanges with MARKGOO 68D-WG078-00-00.
- Installation: Mounts within the lower unit's internal engine water pump assembly.
- Durability: Features a marine-grade metal alloy housing and a high-performance neoprene rubber impeller for corrosion resistance and longevity.
- Complete Service: Includes a new housing, impeller, wear plates, gaskets, and hardware for a comprehensive overhaul.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| 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
Confirm your engine model/year in the table below.
For Yamaha applications, this kit covers specific 4 HP and 5 HP two-stroke models from 1984 to 2002 and F4 four-stroke models from 1999 to 2008.
For Mariner outboards, fitment is specific to 4 HP and 5 HP two-stroke models designated with serial numbers beginning in 6E0 or 6E3.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | - | 4 | 2-Stroke | 1984–1999 | 68D-WG078-00-00 | |
| Yamaha | - | 5 | 2-Stroke | 1984–2002 | 68D-WG078-00-00 | |
| Yamaha | F4 | 4 | 4-Stroke | 1999–2001 | 68D-WG078-00-00 | |
| Yamaha | F4 | 4 | 4-Stroke | 2002–2008 | 68D-WG078-00-00 | |
| Mariner | 4A(6E0) | 4 | 2-Stroke | 68D-WG078-00-00 | Only with Serial Number 6E0 | |
| Mariner | 5C(6E3) | 5 | 2-Stroke | 68D-WG078-00-00 | Only with Serial Number 6E3 | |
| Mariner | - | 4 | 2-Stroke | 68D-WG078-00-00 | Model 96325T with Serial Number 6E0 | |
| Mariner | - | 5 | 2-Stroke | 68D-WG078-00-00 | Model 96325M with Serial Number 6E3 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit with Housing
- Installation
- Internal
- Housing Material
- Marine-grade 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
- High performance neoprene rubber
What’s in the Box
- 1 x Water Pump Impeller (6E0-44352-00-00)
- 1 x Water Pump Housing (68D-G4311-01-00)
- 1 x Cartridge Insert (6E0-44322-02-00)
- 1 x Outer Plate (6E0-44323-00-00)
- 1 x Gasket, Water Pump (68D-G4315-A0-00)
- 2 x Dowel Pin (93604-18080-00)
- 1 x Water Damper Seal (67D-44366-00-00)
- 4 x Bolt (97095-06045-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the gearcase oil from the lower unit.
- Remove the mounting bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.
- Unbolt and remove the old water pump housing to access the impeller and wear plates.
- Clean all mating surfaces thoroughly, removing any old gasket material or sealant.
- Install the new components from the kit in the reverse order of disassembly. Ensure the impeller vanes are oriented correctly (typically bent counter-clockwise).
- Apply a light marine-grade grease to the new gaskets and bolts.
- Re-install the water pump housing, torquing bolts to manufacturer specifications.
- Re-attach the lower unit, refill with fresh gear oil, and reconnect the battery.
- Start the engine using a water source (flushing muffs) and verify a strong, steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my engine?
Check your engine’s model, horsepower, and year against the compatibility table. For Mariner models, you must also verify your engine’s serial number matches the listed prefixes (6E0 or 6E3).
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or a brittle or cracked impeller found during inspection.
How often should the water pump kit be replaced?
As a preventative maintenance item, it is best practice to replace the water pump impeller and gaskets every 1-2 years or every 100-200 hours of operation, especially if used in saltwater.
Why buy a full kit instead of just the impeller?
A full kit ensures all wear components are replaced simultaneously. The housing, wear plates, and seals degrade over time, and replacing only the impeller can lead to premature failure and inefficient cooling.
Can I install this kit myself?
If you have mechanical experience and the correct tools, this is a manageable DIY job. However, due to the importance of the cooling system, professional installation is recommended to ensure safety and performance.
How does an aftermarket part compare to OEM?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials, manufactured in an ISO 9002 facility, and batch-inspected for consistency and quality.
What is the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options will appear at checkout if available for your region.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact support with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
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