Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00)

Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00)

This water pump repair kit is engineered for a wide range of Yamaha 2-stroke and 4-stroke outboard engines from 150HP to 300HP (1992–2023). It provides all essential components needed for a complete cooling system service, including V6 engine variants and F-series models like the F150, F200, F225, and F250.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility and restoring original cooling performance. It is designed to meet or exceed OEM specifications for durability and fitment.

• Complete Service Kit: Includes the impeller, gaskets, O-rings, housing, and all necessary hardware for a full water pump rebuild.
• Durable Construction: Features a housing made from high-strength Plastic (Nylon PA66) for reliable, long-term performance.
• Installation Location: Designed for installation in the outboard's Lower Unit/Gearcase.

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 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)
• 1 x Water Pump Gasket (6E5-44315-A0-00)
• 2 x Dowel Pins (93606-12019-00)
• 4 x Bolts with Washer (90119-08M14-00)
• 1 x Woodruff Key (90280-04M05-00)

Installation Guide

Professional installation is highly recommended. The following are general guidelines:

1. Safety First: Disconnect the battery and ensure the engine is securely mounted on a stand or transom.
2. Drain Gearcase Oil: Place a drain pan under the lower unit and remove the upper and lower drain screws to drain the gear lube.
3. Remove Lower Unit: Unbolt the lower unit from the upper casing. This may require an assistant.
4. Access Water Pump: With the lower unit removed, locate and unbolt the water pump housing.
5. Inspect and Clean: Remove the old impeller, gaskets, and plates. Clean all mating surfaces thoroughly.
6. Install New Components: Install the new gasket, outer plate, woodruff key, and impeller. Ensure the impeller vanes are oriented correctly.
7. Reassemble Pump: Lubricate the new O-rings and install the cartridge insert. Secure the housing with the new bolts and tighten to the specified torque.
8. Reattach Lower Unit: Slide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Bolt it securely.
9. Refill Gearcase Oil: Pump new gear lube into the lower drain hole until it seeps out of the upper hole, then replace both screws.
10. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and verify a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check the comprehensive "Compatible Engine Models" table on this page. For Yamaha owners, you can use the linked serial number guide to identify your exact model and year, then cross-reference it with our compatibility list. Always compare the part numbers and product images to your old parts before ordering.

How often should a water pump impeller be replaced?
As a general maintenance rule, the water pump impeller should be inspected annually and replaced every 1-2 years or 100-200 hours of use, whichever comes first. This interval can be shorter if you operate in saltwater or water with high sediment levels.

What are the signs of a failing water pump?
Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet port, and a dry, cracked, or brittle impeller upon inspection. A damaged housing or seal can also cause water leaks and pressure loss.

What is included in this kit?
This is a complete repair kit that includes the housing, impeller, outer plate, gaskets, O-rings, dowel pins, bolts, and the woodruff key. Please refer to the "Package Contents" list for a detailed breakdown with part numbers.

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.