Water Pump Impeller Kit with Housing for Select Yamaha 150–300 HP Outboards – Replaces 61A-W0078-A2-00
Water Pump Impeller Kit with Housing for Select Yamaha 150–300 HP Outboards – Replaces 61A-W0078-A2-00 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller Kit with Housing for Select Yamaha 150–300 HP O...
Water Pump Impeller Kit with Housing for Select Yamaha 150–300 HP Outboards – Replaces 61A-W0078-A2-00 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller kit with housing is an aftermarket replacement assembly for select Yamaha 150–300 HP outboard applications. The kit is intended for water pump service on compatible lower units and includes the primary pump components needed to replace a worn or damaged impeller, housing, plate, cup, gaskets, O-rings, pins, bolts, washer and impeller key.
The kit is listed as a replacement for Yamaha 61A-W0078-A2-00 and related references including Yamaha 61A-W0078-A3-00, 61A-W0078-A4-00, 64L-W0078-00-00 and 65L-W0078-A0-00, Sierra 18-3396-1, and Mallory 9-48618. Confirm the original part number, engine model, year, serial range and component dimensions before ordering.
- Installation location: Lower unit water pump assembly.
- Construction: Nylon PA66 housing, neoprene impeller, and stainless-steel insert cup and wear plate.
- Kit format: Includes the impeller, housing, cup, plate, gaskets, O-rings, impeller key, pins, bolts and washers listed below.
- Application: Select Yamaha 2-stroke and 4-stroke outboards listed in the compatibility table.
Part Number Matrix
These references are provided to help compare the kit with the part installed on your outboard. They do not replace model, year and serial-number verification.
| Brand | Part Number |
|---|---|
| Yamaha | 61A-W0078-A2-00 |
| Yamaha | 61A-W0078-A3-00 |
| Yamaha | 61A-W0078-A4-00 |
| Yamaha | 64L-W0078-00-00 |
| Yamaha | 65L-W0078-A0-00 |
| Sierra | 18-3396-1 |
| Mallory | 9-48618 |
Engine & Model Compatibility
The applications below are the listed model groups for this replacement kit. Compatibility can vary by model suffix, shaft configuration, production year and serial range. Verify the complete engine identification and compare the original water pump components before installation.
| Brand | Model | Rated HP | Stroke | Years or Range | Reference Part No. |
|---|---|---|---|---|---|
| Yamaha | LZ150, PX150, SX150, VX150, VZ150, Z150 | 150 | 2-Stroke | 1999–2005+ | 61A-W0078-A2-00 |
| Yamaha | VZ175 | 175 | 2-Stroke | 1992–2005+ | 61A-W0078-A2-00 |
| Yamaha | LF200, L200, LX200, LZ200, SX200, VX200, VZ200, Z200 | 200 | 2-Stroke | 1992–2005+ | 61A-W0078-A2-00 |
| Yamaha | F150 | 150 | 4-Stroke | All listed models | 61A-W0078-A2-00 |
| Yamaha | F175 | 175 | 4-Stroke | 2002–2016+ | 61A-W0078-A2-00 |
| Yamaha | F200 | 200 | 4-Stroke | 2002–2016+ | 61A-W0078-A2-00 |
| Yamaha | VX225 | 225 | 2-Stroke | 2000–2005 | 61A-W0078-A2-00 |
| Yamaha | F225 | 225 | 4-Stroke | 2002–2016+ | 61A-W0078-A2-00 |
| Yamaha | VX250, Z250 | 250 | 2-Stroke | 2002–2005+ | 61A-W0078-A2-00 |
| Yamaha | F250 | 250 | 4-Stroke | 2005+ | 61A-W0078-A2-00 |
| Yamaha | LZ300, Z300 | 300 | 2-Stroke | 2003+ | 61A-W0078-A2-00 |
| Yamaha | F300 | 300 | 4-Stroke | 2003+ | 61A-W0078-A2-00 |
Technical Specs
- Product Type
- Aftermarket water pump impeller kit with housing
- Installation
- Lower unit water pump assembly
- Housing Material
- Nylon PA66 plastic
- Housing Color
- Black
- Impeller Material
- Neoprene
- Insert Cup and Wear Plate
- Stainless steel
- Fitting Type
- Replacement assembly; verify application before installation
What’s in the Box
- 1 x Water pump impeller (6E5-44352-01-00)
- 1 x Impeller housing
- 1 x Insert cup (61A-44322-00)
- 1 x Wear plate (6G5-44323-00)
- 1 x Water pump gasket (6E5-44315-A0-00)
- 1 x Impeller key (90280-04M05)
- 1 x O-ring (93210-37M67-00)
- 1 x O-ring (93210-86M38-00)
- 2 x Pin (93606-12019)
- 4 x Bolt and washer (97080-08045)
Installation Notes
- Disconnect the battery, remove the engine cowling and secure the outboard according to the service manual.
- Place a drain pan under the lower unit. If the lower unit is being removed, drain the gearcase lubricant according to the manufacturer’s procedure.
- Disconnect the speedometer tube, if fitted, and remove the fasteners securing the lower unit to the engine.
- Carefully lower and remove the lower unit, supporting it so the driveshaft and shift components are not damaged.
- Remove the water pump housing and existing pump components.
- Clean the mating surfaces and remove old gasket material without damaging the sealing surfaces.
- Install the wear plate, gasket, impeller key and impeller. Confirm that the impeller is seated correctly and that the vanes are oriented according to the service manual.
- Install the insert cup, housing, O-rings and remaining hardware. Tighten fasteners to the engine manufacturer’s specified torque.
- Reinstall the lower unit and confirm proper alignment of the driveshaft, shift shaft and water tube.
- Refill the gearcase with the correct marine gear lubricant if it was drained, then check for leaks and verify water flow before normal operation.
Troubleshooting & FAQ
How do I know if my water pump impeller is failing?
Common symptoms include weak or absent water flow from the telltale, an overheating alarm, rising engine temperature or steam from the exhaust. Stop operation and investigate promptly to help prevent engine damage.
How often should I replace the water pump impeller?
Replacement intervals depend on the engine manufacturer’s schedule and operating conditions. Frequent operation in sand, silt or salt water can shorten service life. Inspect and replace the impeller and damaged related components as required.
My engine overheated. Should I replace only the impeller?
Not necessarily. Inspect the housing, insert cup, wear plate, gaskets and cooling passages as well as the impeller. Heat or debris can damage other pump components, so replace any worn or distorted parts.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the listed applications. It is not manufactured by Yamaha, Sierra or Mallory.
Do I need special tools?
Basic mechanic’s tools, a torque wrench and a suitable gasket scraper are generally required. Additional alignment or removal tools may be needed depending on the engine. Follow the applicable service manual for procedures and torque values.
How can I confirm fitment?
Compare the reference part number, impeller and housing arrangement, engine model, horsepower, stroke, year and serial range with the original equipment and service information before ordering.
Shipping speed and cost
Available shipping methods, delivery estimates and costs are shown at checkout and may vary by destination.
Warranty and returns
Warranty and return eligibility are subject to the seller’s current terms. Contact support with your order details if you need assistance.
Safety & Important Information
- Verify the complete engine model, year, serial range and original part number before purchase.
- Compare the supplied components with the original water pump assembly before installation.
- This is an aftermarket replacement, not an OEM component.
- Use the correct service-manual procedures, torque values and safety equipment. Professional installation is recommended when required.
About Sea Sierra
- Marine Replacement Parts — Replacement components for a range of outboard maintenance applications.
- Application-Focused Listings — Reference numbers and model information are provided to support pre-purchase verification.
- Support — Contact support with your engine details and order information when fitment or installation questions arise.
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