Water Pump Impeller Repair Kit – Fits Yamaha V6 Outboard 150-300HP (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00)

Water Pump Impeller Repair Kit – Fits Yamaha V6 Outboard 150-300HP (Replaces 61A-W0078-A2-00, 61A-W0078-A3-00)

This water pump impeller repair kit is designed for a range of Yamaha V6 outboards from 150HP to 300HP, covering both 2-stroke and 4-stroke models from the 1990s through the 2000s. It provides a reliable, direct-fit solution for maintaining your engine’s cooling system.

It directly replaces Yamaha part numbers 61A-W0078-A1-00, 61A-W0078-A2-00, and 61A-W0078-A3-00, as well as Sierra 18-3396 and Mallory 9-48618.

• Complete Kit: Includes a new impeller, nylon housing, wear plate, gaskets, bolts, and other hardware required for a full replacement.
• Durable Construction: Features a high-strength nylon housing, a flexible rubber impeller, and stainless steel internal components for corrosion resistance.
• Direct Fit Installation: Engineered to match OEM specifications for a straightforward installation without modifications.

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

• 1 x Water Pump Impeller (Replaces 6E5-44352-01)
• 1 x Impeller Nylon Housing
• 1 x Pump Cup
• 1 x Wear Plate (Replaces 6G5-44323-00)
• 1 x Key (Replaces 90280-04M05)
• 1 x Water Pump Gasket (Replaces 6E5-44315-A0)
• 2 x Pin (Replaces 93606-12019)
• 4 x Bolt & Washer (Replaces 90119-08M14)
• 2 x O-Ring (Replaces 93210-37M67, 93210-86M38)

Installation Guide

1. Disconnect the Battery: Ensure the engine is off and disconnect the battery terminals to prevent accidental starting.
2. Remove the Lower Unit: Drain the gearcase oil, then unbolt and carefully lower the gearcase (lower unit) from the outboard's midsection.
3. Access the Water Pump: With the lower unit removed, locate and unbolt the water pump housing to expose the old impeller and components.
4. Inspect and Clean: Remove the old impeller, key, gaskets, and plates. Thoroughly clean all mounting surfaces and inspect the housing for cracks or warping.
5. Install New Components: Assemble the new kit. Install the wear plate, gasket, impeller key, and the new impeller (turn the driveshaft clockwise to seat the fins). Place the pump cup and new housing on top.
6. Reassemble and Test: Secure the new housing with the provided bolts. Reattach the lower unit to the outboard, refill the gearcase oil, and reconnect the battery. Start the engine and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How can I confirm this kit will fit my specific Yamaha engine?
A: First, check your engine's model, HP, and year against the "Compatible Engine Models" table above. For definitive confirmation, we recommend using the Yamaha Serial Number Guide linked above to identify your exact model and then cross-reference the OEM part number (61A-W0078-A3-00) with your engine's parts diagram.

Q: What are the common signs that a water pump impeller needs to be replaced?
A: The most common symptoms of a failing impeller are a weak or inconsistent water stream from the "tell-tale" outlet, or your engine overheating at low or high speeds. Regular inspection is recommended.

Q: How often should I replace my water pump impeller?
A: As a general maintenance rule, it is best to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This can vary depending on usage conditions (e.g., saltwater vs. freshwater, sandy/silty water).

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.