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

This complete water pump repair kit provides a reliable solution for maintaining the cooling system on Yamaha 2-stroke and 4-stroke outboard engines ranging from 150 to 300 HP, covering a wide array of models from 1992 to 2024. It is engineered to meet or exceed OEM specifications for fit, form, and function, ensuring proper water circulation to prevent engine overheating.

This kit serves as a direct replacement for multiple Yamaha and aftermarket part numbers, simplifying the process of finding the correct components for your scheduled maintenance or repair.

• Complete Kit: Includes the impeller, housing, wear plate, gaskets, and all necessary mounting hardware for a comprehensive overhaul.
• High-Quality Materials: Features a durable neoprene rubber impeller, a high-strength Nylon PA66 plastic housing, stainless steel components, and non-asbestos gaskets for longevity.
• Direct Fitment: Designed for straightforward installation with no modifications required, matching OEM standards.

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 (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 Guide

1. Disconnect Power: Start by disconnecting the battery and disabling the ignition system for safety.
2. Remove Lower Unit: Drain the gearcase oil, then unbolt and carefully slide the lower unit (gearcase) off the main engine housing.
3. Access the Pump: Locate the water pump assembly on top of the lower unit. Remove the bolts securing the pump housing.
4. Disassemble Old Pump: Lift off the housing and note the order of the components. Remove the old impeller, wear plate, gaskets, and key.
5. Clean Surfaces: Thoroughly clean all mating surfaces, removing any old gasket material or corrosion.
6. Install New Components: Install the new woodruff key, wear plate, and gaskets. Slide the new impeller onto the driveshaft, rotating it in the direction of engine operation to seat the vanes correctly inside the new housing.
7. Secure New Housing: Place the new housing over the impeller and tighten the bolts to the manufacturer's specified torque.
8. Reinstall Lower Unit: Re-align the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly seated. Bolt it back into place and refill the gearcase with fresh oil.
9. Test Operation: Reconnect the battery. Using a water source (flushing muffs), start the engine and check for a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: First, check the 'Compatible Engine Models' table to see if your model is listed. For confirmation, we recommend using our Yamaha Serial Number Guide to verify your model and year. Finally, cross-reference your existing part number with those in our 'Part Number Cross-Reference' section.

Q: How often should I replace my water pump impeller?

A: For optimal performance and engine safety, we recommend inspecting the impeller every season (or every 100 hours of use). A full replacement of the water pump kit is recommended every 2-3 seasons, or immediately if you notice reduced water flow, engine overheating, or find cracks and stiffness in the impeller vanes.

Q: What are the signs of a failing water pump?

A: The most common signs include the engine overheating, especially at idle or low speeds, and a weak or inconsistent stream of water from the tell-tale (water indicator) port. During a physical inspection, you might find that the impeller's rubber vanes are cracked, brittle, or have taken a permanent set.

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.