Water Pump Impeller Repair Kit for Yamaha V6 Outboards 150–300 HP – OEM Reference 61A-W0078-A1-00, 61A-W0078-A2-00, 61A-W0078-A3-00
Water Pump Impeller Repair Kit for Yamaha V6 Outboards 150–300 HP – OEM Reference 61A-W0078-A1-00, 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 for Yamaha V6 Outboards 150–300 HP –...
Water Pump Impeller Repair Kit for Yamaha V6 Outboards 150–300 HP – OEM Reference 61A-W0078-A1-00, 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 is intended for servicing the cooling systems of selected Yamaha V6 outboard engines rated from 150 HP to 300 HP. The listed applications include selected 2-stroke V6 and VZ-series engines, as well as certain F-series 4-stroke models. Compatibility depends on the exact engine model, year, shaft configuration, and serial-number range, so confirm the original water-pump part number before ordering.
The kit is listed as a replacement for Yamaha OEM reference numbers 61A-W0078-A1-00, 61A-W0078-A2-00, and 61A-W0078-A3-00. Sierra 18-3396 and Mallory 9-48618 are also listed as aftermarket reference numbers. These numbers should be used for cross-reference only; verify the dimensions and application for your engine.
- Service kit for the outboard water-pump assembly.
- Includes an impeller, pump housing and related wear, sealing, and mounting components listed below.
- Designed for replacement of worn or damaged water-pump components during cooling-system service.
- Aftermarket replacement product; not a Yamaha Genuine OEM component.
Part Number Matrix
Use the following numbers as reference points when comparing the original part with this replacement kit.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 61A-W0078-A1-00 | OEM reference |
| Yamaha | 61A-W0078-A2-00 | OEM reference |
| Yamaha | 61A-W0078-A3-00 | OEM reference |
| Sierra | 18-3396 | Aftermarket reference |
| Mallory | 9-48618 | Aftermarket reference |
Engine & Model Compatibility
The applications below are the listed compatibility references for this kit. Yamaha model families can contain multiple configurations, so the model name and horsepower alone are not sufficient to confirm fitment. Check the full model designation, production year, shaft configuration, serial number, and original pump-part number before installation.
| Brand | Model or Family | Rated HP | Stroke | Listed Years | OEM Reference |
|---|---|---|---|---|---|
| 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 Specifications
- Product Type
- Water pump impeller repair kit
- Application
- Selected Yamaha V6 outboard water-pump assemblies
- Installation
- Replacement service installation; verify fitment before assembly
- Housing Material
- Nylon
- Housing Color
- Black
- Approximate Weight
- 0.66 kg (1.46 lb)
- Impeller Material
- Rubber
- Other Components
- Stainless-steel wear and mounting components as listed in the package contents
- Product Status
- Aftermarket replacement; not Yamaha Genuine OEM
What’s in the Box
- 1 × Water pump impeller, reference 6E5-44352-01
- 1 × Impeller nylon housing
- 1 × Pump cup
- 1 × Wear plate, reference 6G5-44323-00
- 1 × Impeller key, reference 90280-04M05
- 1 × Water-pump gasket, reference 6E5-44315-A0
- 2 × Pins, reference 93606-12019
- 4 × Bolts and washers, reference 90119-08M14
- 2 × O-rings, references 93210-37M67 and 93210-86M38
Installation Notes
- Disconnect the battery and make sure the engine is switched off and cool.
- Shift the outboard into neutral. Remove the lower unit according to the service procedure for your exact engine.
- Remove the water-pump housing fasteners and lift the housing to expose the impeller. Note the orientation of the original parts.
- Remove the old impeller, key, wear plate, pump cup, gaskets, pins, bolts, washers, and O-rings as applicable. Clean all mating surfaces.
- Install the replacement wear plate, gasket, and pump cup in the correct order for your engine.
- Fit the impeller key to the driveshaft and install the impeller. Rotate the driveshaft in the direction specified by the engine service manual so the vanes fold correctly.
- Install the replacement O-rings and position the housing over the impeller. Secure the housing with the supplied fasteners and use the manufacturer’s specified torque values.
- Reinstall the lower unit, ensuring correct alignment of the driveshaft and water tube.
- Test the engine with an appropriate water supply and confirm that cooling-water flow and engine temperature are normal before returning the engine to service.
Troubleshooting & FAQ
How do I confirm that this kit fits my Yamaha outboard?
Compare the original water-pump assembly and OEM reference number with the numbers listed above. Also verify the exact model designation, horsepower, stroke, year, shaft configuration, and serial-number range. If any of these details differ, consult the engine service information before ordering.
What are the signs of a failing water-pump impeller?
Common signs include overheating at idle or low speed, a weak or missing telltale stream, reduced cooling-water flow, or a dry, cracked, brittle, or damaged impeller. Continued operation with inadequate cooling can cause severe engine damage.
How often should the impeller be replaced?
Inspect the impeller as part of regular maintenance and replace it when it shows wear, cracking, deformation, stiffness, or damage. Replacement intervals vary with operating hours and water conditions; saltwater, sand, silt, and prolonged storage can shorten service life.
Is lubricant needed during installation?
Use the lubricant recommended by the engine service manual. A suitable water-based installation lubricant can help protect the impeller during initial startup. Avoid petroleum-based products unless specifically approved for the impeller material.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit. Yamaha numbers are provided as OEM reference numbers for identification and compatibility checking.
What are the warranty and return terms?
Warranty coverage, return eligibility, and return periods are governed by the applicable seller policy. Contact the seller before installation if the supplied parts do not match the ordered application.
Safety & Important Information
- Verify the original part number, engine model, year, stroke, shaft configuration, and serial-number range before purchase.
- Do not operate the engine without an adequate water supply during testing.
- Follow the engine manufacturer’s service-manual procedures and torque specifications.
- Inspect all supplied components before installation. Do not install damaged, incorrectly sized, or mismatched parts.
- Professional installation is recommended if you are unfamiliar with outboard lower-unit or water-pump service.
- This is an aftermarket replacement and is not a Yamaha Genuine OEM component.
About Sea Sierra
- Marine Replacement Parts — Parts selected for common outboard maintenance and repair applications.
- Application-Focused Listings — Product references and fitment information are provided to assist with part identification.
- Customer Support — Contact support with the complete engine model and original part information when application assistance is needed.
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