Water Pump Impeller Repair Kit – Fits Yamaha V6 150-300HP (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00)
Water Pump Impeller Repair Kit – Fits Yamaha V6 150-300HP (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit – Fits Yamaha V6 150-300HP (Replaces...
Water Pump Impeller Repair Kit – Fits Yamaha V6 150-300HP (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit – Fits Yamaha V6 Outboard 150-300HP is a complete assembly for servicing your engine's cooling system. It's designed for a wide range of Yamaha V6 outboards (150HP to 300HP), including both 2-stroke and 4-stroke models manufactured from the 1990s through the 2000s, ensuring broad compatibility for many popular engines.
It serves as a direct replacement for Yamaha OEM part numbers 61A-W0078-A1-00, 61A-W0078-A2-00, and 61A-W0078-A3-00, as well as aftermarket equivalents Sierra 18-3396 and Mallory 9-48618.
- Engineered for direct-fit installation, matching OEM housing and component dimensions.
- Constructed with a durable nylon housing, a high-performance rubber impeller, and stainless steel wear components for corrosion resistance.
- Includes all necessary gaskets, O-rings, and hardware for a comprehensive service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 61A-W0078-A1-00 | 61A-W0078-A2-00 |
| Yamaha | 61A-W0078-A2-00 | 61A-W0078-A3-00 |
| Yamaha | 61A-W0078-A3-00 | |
| Sierra | 18-3396 | |
| Mallory | 9-48618 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for various Yamaha V6 and select four-stroke (F-series) and HPDI (VZ-series) engines. Always verify your specific model and year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | V6 | 175 | 2-Stroke | 1992–2002 | 61A-W0078-A3-00 | |
| Yamaha | V6 | 200 | 2-Stroke | 1992–1999 | 61A-W0078-A3-00 | |
| Yamaha | F200 | 200 | 4-Stroke | 2002 | 61A-W0078-A3-00 | |
| Yamaha | V6 | 225 | 2-Stroke | 1992–1999 | 61A-W0078-A3-00 | |
| Yamaha | F225 | 225 | 4-Stroke | 2002 | 61A-W0078-A3-00 | |
| Yamaha | V6 | 250 | 2-Stroke | 1990–1999 | 61A-W0078-A3-00 | |
| Yamaha | VZ200 | 200 | 2-Stroke | 2001–2002 | 61A-W0078-A3-00 | |
| Yamaha | VZ225 | 225 | 2-Stroke | 2000–2002 | 61A-W0078-A3-00 | |
| Yamaha | VZ250 | 250 | 2-Stroke | 2002 | 61A-W0078-A3-00 | |
| Yamaha | VZ300 | 300 | 2-Stroke | 2004–2009 | 61A-W0078-A3-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct fit replacement
- Housing Material
- Nylon
- Housing Color
- Black
- Weight
- 0.66 kg (1.46 lb)
- Other Technical Attributes
- Stainless steel components, rubber impeller
- Warranty
- 30-day replacement/refund (varies by seller)
What’s in the Box
- 1 x Water Pump Impeller (6E5-44352-01)
- 1 x Impeller Nylon Housing
- 1 x Pump Cup
- 1 x Wear Plate (6G5-44323-00)
- 1 x Key (90280-04M05)
- 1 x Water Pump Gasket (6E5-44315-A0)
- 2 x Pin (93606-12019)
- 4 x Bolt & Washer (90119-08M14)
- 2 x O-Ring (93210-37M67, 93210-86M38)
Installation Notes
- Disconnect the battery and ensure the engine is off and cool.
- Shift the outboard into neutral and remove the lower unit (gearcase) by unbolting it from the midsection.
- Remove the old water pump housing bolts and lift the housing to expose the impeller. Note the orientation of the old components.
- Remove the old impeller, key, wear plate, cup, and gaskets. Clean all mating surfaces thoroughly.
- Install the new wear plate, gasket, and pump cup into the housing.
- Slide the new impeller key onto the driveshaft and install the new impeller, turning the shaft clockwise to bed the vanes correctly.
- Install the new O-rings and position the new housing over the impeller, securing it with the new bolts and washers. Torque to manufacturer specifications.
- Reinstall the lower unit, ensuring the driveshaft and water tube align correctly, and secure it.
- Reconnect the battery and test the engine with a water supply to confirm proper cooling system function.
Troubleshooting & FAQ
How do I know if this kit fits my specific Yamaha outboard?
This kit is designed for a broad range of V6 models from 150HP to 300HP. The best way to confirm fitment is to check your engine's OEM part number against the ones listed in our Part Number Matrix (61A-W0078-A1/A2/A3-00). You can also review the Engine & Model Compatibility table, but always cross-reference the part number for accuracy.
What are the signs of a failing water pump impeller?
Common signs include an engine that is overheating at idle or low speeds, a weak or non-existent "telltale" water stream, or a dry, cracked, or brittle impeller upon inspection. Reduced cooling performance can cause severe engine damage, so it's critical to address these symptoms immediately.
How often should the water pump impeller be replaced?
As a general maintenance rule, it is recommended to inspect your water pump impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you operate frequently in saltwater or sandy/silty conditions.
Is any special grease needed for installation?
Yes, applying a light coat of marine-grade waterproof grease or dish soap to the inside of the pump cup and on the impeller vanes can ease installation and provide a better initial seal. Do not use petroleum-based grease, which can damage the rubber.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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