Water Pump Impeller Kit for Yamaha 150–300 HP Outboards — Replaces Yamaha 61A-W0078-A2-00

Product Details

This water pump impeller kit for Yamaha 150–300 HP outboards is intended for water pump service on specified Yamaha outboard models. The kit includes an impeller and related wear, sealing, and installation components listed below. Replacing worn water pump components helps maintain proper cooling-water circulation and reduce the risk of overheating caused by a deteriorated impeller or worn pump parts.

The kit is listed as a replacement for the Yamaha reference numbers and aftermarket references shown in the part number matrix. Always compare the engine model, horsepower, year, stroke, and existing part number before ordering.

• Water pump service kit for selected Yamaha outboards.
• Includes an impeller, pump cup, wear plate, gaskets, O-rings, dowel pins, and bolts with washers as listed.
• Designed as a replacement service kit for the specified water pump application.

Part Number Matrix

Use these references to help compare the replacement application. Part-number cross-references should be confirmed against the complete engine model and year.

Engine & Model Compatibility

The following applications are associated with the listed Yamaha water pump reference. Confirm the complete model designation, production year, horsepower, stroke, and original part number before installation.

Technical Specs

Product Type

Water pump impeller kit

Application

Selected Yamaha 150–300 HP outboards listed above

Installation

Replacement water pump service component

Housing Material

Water pump housing is not included; component materials may vary by manufacturer

Housing Color

Not applicable to the supplied kit; outer housing is not included

Weight

Approximately 100 g (0.22 lb)

What’s in the Box

• 1 × Neoprene impeller: 6E5-44352-01-00
• 1 × Pump cup: 61A-44322-00
• 1 × Wear plate: 6G5-44323-00
• 1 × Water pump gasket: 6E5-44315-A0-00
• 1 × Woodruff key: 90280-04M05-00
• 1 × O-ring: 93210-37M67-00
• 1 × O-ring: 93210-86M38-00
• 2 × Dowel pins: 93606-12019-00
• 4 × Bolts with washers: 90119-08M14-00

Installation Notes

1. Disconnect the battery and shift the outboard into neutral.
2. Place a drain pan under the lower unit and remove the gear-lube drain screw to empty the oil.
3. Remove the bolts securing the lower unit to the engine.
4. Carefully lower and separate the lower unit from the driveshaft housing.
5. Locate and remove the water pump housing fasteners.
6. Remove the old impeller, gaskets, wear plate, pump cup, and O-rings as applicable. Clean all mating surfaces thoroughly.
7. Inspect the water pump housing for cracks, warping, or scoring. Replace damaged components before reassembly.
8. Install the new wear plate, gaskets, pump cup, impeller, key, and seals from the kit. Ensure the impeller vanes are oriented correctly.
9. Reinstall the water pump housing and tighten fasteners to the engine manufacturer’s specifications.
10. Reassemble the lower unit, ensuring that the driveshaft and water tube align correctly.
11. Refill the lower unit with the specified marine gear lubricant.
12. Reconnect the battery, start the engine using an appropriate water supply or flushing muffs, and verify a strong tell-tale water stream.

Troubleshooting & FAQ

Safety & Important Information

• Verify the complete engine model, year, horsepower, stroke, and existing part number before ordering.
• Do not operate an outboard with an overheating engine or an absent tell-tale water stream.
• Follow the applicable service manual for disassembly, torque values, lubrication, and testing.
• Professional installation is recommended if you are not experienced with outboard lower-unit or water-pump service.
• This is an aftermarket replacement kit, not an OEM Yamaha component.

About Sea Sierra

• Marine Replacement Parts — Replacement components for routine marine maintenance and repair.
• Application-Focused Information — Use the listed part numbers and complete engine details to confirm compatibility.
• Service-Minded Support — Consult the product information and applicable engine service documentation before installation.