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

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

This comprehensive water pump repair kit is engineered for a wide range of Yamaha V6 outboard engines from 150HP to 300HP. It is compatible with both 2-stroke and 4-stroke models manufactured from the mid-1990s through the current model year, providing a direct-fit replacement for the original assembly.

This kit serves as a direct replacement for Yamaha parts 61A-W0078-A2-00, 61A-W0078-A3-00, and other superseded numbers, ensuring a precise and reliable installation.

• Includes a complete set of components for a full service: impeller, housing, wear plate, gaskets, o-rings, and hardware.
• Constructed from durable materials, including a Nylon PA66 plastic housing and a neoprene rubber impeller for longevity.
• Designed as a direct-fit replacement, requiring no modifications for installation.

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 Cartridge Insert (61A-44322-02-00)
• 1 x O-Ring (93210-86M38-00)
• 1 x O-Ring (93210-37M67-00)
• 1 x Impeller (6E5-44352-01-00)
• 1 x Cartridge Outer Plate (6G5-44323-01-00 / 6G5-44323-00-00)
• 1 x Water Pump Gasket (6E5-44315-A0-00)
• 2 x Dowel Pins (93606-12019-00)
• 4 x Bolts with Washers (90119-08M14-00)
• 1 x Woodruff Key (90280-04M05-00)

Please Note: Some kit variations may also include the Water Pump Housing (61A-44311-01-00), Water Seal Dampener (6E5-44365-01-00), and Housing Cover (6E5-44312-00-00). Verify package contents against your needs.

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is securely mounted on a stand or transom before beginning work.
2. Remove Lower Unit: Drain the gearcase lubricant. Unbolt and carefully detach the lower unit (gearcase) from the upper engine casing.
3. Access the Water Pump: With the lower unit removed, locate and unbolt the water pump housing, typically secured with four bolts.
4. Remove Old Components: Slide the old housing, impeller, wear plates, and gaskets off the driveshaft. Note the orientation of the impeller vanes.
5. Clean Surfaces: Thoroughly clean all mating surfaces, removing any old gasket material or corrosion to ensure a proper seal.
6. Install New Impeller: Lightly grease the new housing interior. Slide the new Woodruff key onto the shaft and install the new impeller, turning the driveshaft clockwise to bend the vanes correctly.
7. Assemble New Kit: Place the new gasket and wear plate, followed by the assembled housing with its new insert and seals.
8. Secure Housing: Fasten the new housing using the provided bolts and tighten them to the manufacturer's specified torque.
9. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with bolts and refill the gearcase with fresh lubricant.
10. Test Operation: Reconnect the battery. Start the engine using a water source (flushing muffs) and confirm a strong, steady stream from the "tell-tale" water outlet.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Start by checking the Part Number Cross-Reference table to see if your existing part number is listed. Next, review the Compatible Engine Models table. It is crucial to match your engine's specific model, horsepower, and year range. For assistance finding these details, use our Yamaha Serial Number Guide linked above.

What's the difference between this and an OEM Yamaha kit?
This is an aftermarket kit manufactured to meet or exceed OEM specifications. It features high-quality materials such as a durable Nylon PA66 housing and a neoprene impeller, offering comparable performance and longevity as a cost-effective alternative to the original manufacturer's part.

How often should I replace my water pump impeller?
For optimal engine cooling and protection, it is recommended to inspect the water pump annually. We suggest replacing the impeller and gaskets every 1-2 years or every 100-200 hours of use, with more frequent changes if operating primarily in saltwater or silty/sandy conditions.

What are the signs of a failing water pump?
Common symptoms include the engine running hotter than normal or an overheating alarm, a weak or non-existent water stream from the tell-tale outlet, or a dry, cracked, or brittle impeller discovered during a visual inspection.

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.