Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078 Series)

Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078 Series)

This water pump repair kit is designed for a wide range of Yamaha V6 outboards, covering both 2-stroke and 4-stroke models from 150 to 300 HP. It provides a reliable solution for maintaining your engine’s cooling system to prevent overheating and ensure optimal performance.

This assembly is a direct replacement for Yamaha part numbers 61A-W0078-A1-00, 61A-W0078-A2-00, 61A-W0078-A3-00, and 61A-W0078-A4-00, as well as Sierra 18-3396 and 18-3395.

• Complete Kit: Includes the impeller, housing, gaskets, O-rings, and all necessary hardware for a full replacement.
• Broad Compatibility: Fits an extensive list of Yamaha V6 engines manufactured from 1991 to the present.
• 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 Seal Damper (6E5-44365-00-00)
• 1 x Water Pump Housing Cover (6E5-44312-00-00)
• 1 x Water Pump Housing (61A-44311-01-00)
• 1 x Drive Shaft Collar (61A-45527-00-00)
• 1 x Spacer (61A-45538-00-00)
• 1 x Wave Washer (90206-22M19-00)
• 2 x Plate Washer (90201-22M01-00)
• 1 x Impeller
• 1 x Gasket Set
• 1 x O-rings Set
• 1 x Woodruff Key

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is in a stable, secure position before beginning work.
2. Access the Lower Unit: Drain the gearcase oil. Unbolt and carefully remove the lower unit (gearcase) from the outboard's midsection.
3. Remove the Old Water Pump: Unscrew the bolts securing the water pump housing. Slide the housing and old impeller off the driveshaft.
4. Clean and Inspect: Thoroughly clean the mounting surfaces, removing any old gasket material or sealant residue. Inspect the driveshaft for any wear or damage.
5. Install New Components: Place the new Woodruff key and impeller onto the driveshaft. Slide the new housing, gaskets, and seals into place according to the manual's diagram.
6. Reassemble: Torque the housing bolts to the manufacturer's specified value. Re-install the lower unit, ensuring the driveshaft and water tube align correctly. Refill the gearcase with fresh oil.

Troubleshooting & FAQ

How do I confirm this fits my engine?
First, check the "Compatible Engine Models" table on this page. For Yamaha owners, you can use the linked guides to find your serial number and review parts diagrams to ensure a perfect match.

How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect and/or replace the water pump impeller and wear parts every 300 operating hours or every 3 years, whichever comes first. This interval can be shorter if you operate in sandy or debris-heavy water.

What are the signs of a failing water pump?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent "telltale" water stream, and, in severe cases, an engine overheat alarm.

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.