Water Pump Impeller Repair Kit – Fits Yamaha Outboard 150-300 HP (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00)

Water Pump Impeller Repair Kit – Fits Yamaha Outboard 150-300 HP

This complete water pump repair kit is designed for Yamaha 2-stroke and 4-stroke outboard engines ranging from 150 to 300 HP. It is compatible with a wide range of V6 HPDI, V6 OX66, and V6 F-series outboard models, providing a comprehensive solution for cooling system maintenance.

This kit serves as a direct replacement for Yamaha part numbers 61A-W0078-A2-00, 61A-W0078-A3-00, and 61A-W0078-A4-00, along with Sierra aftermarket parts 18-3396-1 and 18-3395.

• Installation Method: Designed for direct OEM replacement with no modifications required.
• Premium Materials: Features a durable Nylon PA66 plastic housing, a high-performance neoprene marine rubber impeller, and 316 stainless steel components for corrosion resistance.
• Complete Kit: Includes all necessary gaskets, O-rings, and hardware for a full rebuild.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This kit includes the following components for a complete water pump service:

• 1 x Woodruff Key (90280-04M05-00)
• 1 x Outer Plate, Cartridge (6G5-44323-00-00)
• 4 x With Washer Bolt (90119-08M14-00)
• 1 x Insert (Cartridge) (61A-44322-01-00)
• 1 x O-Ring (93210-86M38-00)
• 1 x Water Pump Gasket (6E5-44315-A0-00)
• 1 x O-Ring (93210-37M67-00)
• 1 x Impeller (6E5-44352-00-00)
• 1 x Dowel Pin (93606-12019-00)

Explosion Diagram

Installation Guide

1. Disconnect the negative battery cable and remove the engine cowling.
2. Drain the gear lube from the lower unit completely.
3. Remove the mounting bolts that attach the lower unit to the midsection and carefully detach it.
4. Unbolt and remove the water pump housing from the top of the lower unit.
5. Slide the old impeller off the drive shaft, making sure to remove the Woodruff key.
6. Remove the old wear plate, gaskets, and O-rings from the housing and base.
7. Thoroughly clean the mating surfaces of the pump housing and base.
8. Install the new gasket and wear plate onto the lower unit.
9. Install the new Woodruff key and slide the new impeller onto the driveshaft, turning clockwise to seat the vanes.
10. Lubricate the new housing insert and O-rings, then install the housing over the impeller.
11. Secure the housing with the provided bolts, torquing them to the manufacturer's specification.
12. Reinstall the lower unit, refill with fresh gear lube, and test the engine in water to confirm proper water flow.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?

Review the "Compatible Engine Models" and "Part Number Cross-Reference" tables on this page. For Yamaha owners, you can use the linked Serial Number Guide to verify your exact model and year. Comparing the parts in the product photos to your existing parts is also a reliable verification step.

What are the signs of a failing water pump impeller?

Common signs include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the "telltale" outlet port, and a brittle, cracked, or deformed impeller upon visual inspection.

How often should the water pump impeller be replaced?

As a critical preventative maintenance item, the impeller should be inspected annually and replaced every 1-2 years or 100-200 hours of operation, whichever comes first, to prevent cooling system failure and engine damage.

OEM vs. Aftermarket?

This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?

We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?

This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.