Water Pump Impeller Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00)
Water Pump Impeller Kit – Fits Yamaha 150-300 HP Outboards (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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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Water Pump Impeller Kit – Fits Yamaha 150-300 HP Outboards (Replace...
Water Pump Impeller Kit – Fits Yamaha 150-300 HP Outboards (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 is a complete Water Pump Impeller Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00), engineered for reliable performance in Yamaha 2-stroke and 4-stroke engines from 1992 through 2024. It provides all necessary components to restore your engine's cooling system to factory specifications.
The kit serves as a direct replacement for Yamaha part numbers 61A-W0078-A2-00, 61A-W0078-A3-00, and 61A-W0078-A4-00, and interchanges with aftermarket parts including Sierra 18-3396-1 and Mallory 9-48618.
- Installs as a direct OEM-spec replacement.
- Built with durable materials: neoprene impeller, nylon housing, and stainless steel hardware.
- Kit includes all essential components for a full rebuild: housing, impeller, wear plate, gaskets, and hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 61A-W0078-A2-00 | 61A-W0078-A3-00 | Original part number. |
| Yamaha | 61A-W0078-A3-00 | 61A-W0078-A4-00 | |
| Yamaha | 61A-W0078-A4-00 | Current OEM part number. | |
| Yamaha | 64L-W0078-00-00 | Alternative OEM reference. | |
| Yamaha | 65L-W0078-A0-00 | Alternative OEM reference. | |
| Sierra | 18-3396-1 | Aftermarket interchange. | |
| Mallory | 9-48618 | Aftermarket interchange. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F150 | 150 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | F175 | 175 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | F200 | 200 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | F225 | 225 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | F250 | 250 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | F300 | 300 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | VF175LA | 175 | 4-Stroke | 2015–2016 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | LF150 | 150 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | LF200 | 200 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | LF225 | 225 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | LF250 | 250 | 4-Stroke | All Models | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | P150 | 150 | 2-Stroke | 1992–1996 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | P175 | 175 | 2-Stroke | 1994–1996 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | P200 | 200 | 2-Stroke | 1991–1996 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | C150 | 150 | 2-Stroke | 1996–1999 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | PX150 | 150 | 2-Stroke | 1999 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | S150/SX150 | 150 | 2-Stroke | 1996–2005 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | S200/SX200 | 200 | 2-Stroke | 1996–2005 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | S250/SX250 | 250 | 2-Stroke | 1996–2003 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | V150-V250 | 150-250 | 2-Stroke | 1996–2004 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | VX150-VX250 | 150-250 | 2-Stroke | 1996–2004 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | VZ150 | 150 | 2-Stroke | 1997–2012 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | VZ175 | 175 | 2-Stroke | 2001–2012 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | VZ200 (2.6L) | 200 | 2-Stroke | 1997–2004 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | Z150-Z300 | 150-300 | 2-Stroke | 1997–2012 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | 225 | 225 | 2-Stroke | 1992–2023 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
| Yamaha | 250 | 250 | 2-Stroke | 1992–2023 | 61A-W0078-A2-00 | Superseded by 61A-W0078-A3-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit with Housing
- Installation
- Direct OEM replacement
- Housing Material
- Plastic (Nylon PA66)
- Impeller Material
- Neoprene rubber
- Other Materials
- Stainless steel components, non-asbestos gaskets
- Warranty
- 1 Year (JLM Marine)
- Other Technical Attributes
- Kit includes housing, impeller, wear plate, gaskets, and all mounting hardware
What’s in the Box
- 1 x Water Pump Impeller (6E5-44352-01-00)
- 1 x Impeller Housing (6E5-44311-00-00/61A-44311-01-00)
- 1 x Insert Cup/Cartridge (61A-44322-00-00/61A-44322-02-00)
- 1 x Wear Plate (6G5-44323-00-00/6G5-44323-01-00)
- 1 x Water Pump Gasket (6E5-44315-A0-00)
- 1 x Woodruff Key (90280-04M05-00)
- 2 x Dowel Pin (93606-12019-00)
- 4 x Bolt with Washer (90119-08M14-00/90209-098M02)
- 1 x O-Ring (93210-37M67-00)
- 1 x O-Ring (93210-86M38-00)
Installation Notes
- Disconnect the negative battery terminal and remove the engine cover.
- Drain the gearcase oil and remove the lower unit (gearcase) from the outboard.
- Unbolt the existing water pump housing to expose the impeller and wear plate.
- Remove the old impeller, key, gaskets, and plates, noting their orientation.
- Thoroughly clean all mating surfaces, removing any old gasket material or sealant.
- Install the new water pump gasket, wear plate, insert cup, and woodruff key.
- Lightly lubricate the interior of the new housing and slide the new impeller onto the driveshaft, rotating it clockwise to seat the vanes.
- Install the new housing and tighten the bolts in a crisscross pattern to the manufacturer's torque specification.
- Reinstall the lower unit, refill the gearcase oil with the correct grade, and reconnect the battery.
- Test the engine in water, ensuring a steady stream of water is exiting the tell-tale port.
Troubleshooting & FAQ
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace the entire water pump kit every 2-3 seasons or every 200-300 hours of use, whichever comes first. This interval can be shorter in saltwater or high-sediment environments.
What are the signs of a failing water pump?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" port, a high temperature alarm sounding, or reduced engine performance as the ECU enters a self-protection mode.
Will this kit fit my engine if the part number is slightly different?
Potentially. Manufacturers often supersede part numbers. This kit replaces multiple older numbers like 61A-W0078-A2-00. Always use our detailed compatibility table to match your specific engine model and year. If you are unsure, do not purchase and contact us with your engine details first.
Is this a complete kit, or do I need other parts?
This is a complete repair kit that includes the housing, impeller, wear plate, gaskets, o-rings, and all necessary mounting hardware (pins, bolts). No other components are typically required for a standard water pump service.
OEM vs. Aftermarket: What's the difference?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and performance. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure dimensional accuracy and material consistency.
How fast do you ship and what does it cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most orders. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, contact our support team with your order details for assistance. Returns are accepted within our standard window, provided the item is unused and in its original packaging. Please see our full 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.
Payment & Security
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