Water Pump Repair Kit – Fits Yamaha 75-250HP (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00)

Water Pump Repair Kit – Fits Yamaha 75-300HP (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00)

This water pump repair kit is designed for a wide range of Yamaha outboard motors, providing a reliable solution for maintaining your engine's cooling system. It is engineered to meet or exceed OEM specifications for fit, form, and function, ensuring proper performance and longevity.

This kit is a direct replacement for multiple Yamaha and aftermarket part numbers, compatible with various 2-stroke (150-250HP) and 4-stroke (75-300HP) models. Please consult the compatibility tables below to ensure this part is right for your specific engine.

• Installation Method: Direct OEM replacement.
• Kit Contents: Includes impeller, gaskets, O-rings, plate, and hardware for a complete overhaul.
• Engine Compatibility: Fits a broad range of Yamaha V6, HPDI, Carb, and EFI models from 1992 to 2023.

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 (Replaces 61A-44322-02-00)
• 1 x Water Pump Gasket (Replaces 6E5-44315-A0-00)
• 1 x Impeller (Replaces 6E5-44352-01-00)
• 1 x Cartridge Outer Plate (Replaces 6G5-44323-01-00)
• 4 x Bolt with Washer (Replaces 90119-08191-00)
• 1 x Woodruff Key (Replaces 90280-04M05-00)
• 1 x O-Ring (Replaces 93210-37M67-00)
• 1 x O-Ring (Replaces 93210-86M38-00)
• 2 x Dowel Pin (Replaces 93606-12019-00)

Installation Guide

1. Disconnect Power: Disconnect the battery and shift the outboard into neutral.
2. Access Lower Unit: Remove the bolts securing the lower unit (gearcase) to the upper casing and carefully lower it.
3. Remove Old Pump: Unbolt and remove the old water pump housing to expose the impeller and other components.
4. Inspect and Clean: Clean the housing interior and driveshaft. Inspect for scoring, warping, or corrosion.
5. Install New Components: Lightly grease the new O-rings and insert the new cartridge and key. Slide the new impeller onto the driveshaft, rotating it in the direction of engine operation.
6. Reassemble Pump: Place the new gasket and outer plate, then secure the housing with the new bolts, tightening them to the manufacturer's specified torque.
7. Reattach Lower Unit: Carefully raise the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with bolts.
8. Test Operation: Reconnect the battery and start the engine in a water source to verify a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check the comprehensive "Compatible Engine Models" tables on this page. Second, cross-reference your existing part number with our "Part Number Cross-Reference" table to ensure it matches Yamaha, Sierra, or Mallory numbers we replace.

What are the signs that my water pump needs replacement?
Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or a brittle or cracked impeller found during a routine inspection.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect and likely replace your impeller every 100 hours of use or at least once per boating season, especially for boats used in saltwater.

What is the difference between part number 61A-W0078-A3-00 and 61A-W0078-A4-00?
The part number 61A-W0078-A4-00 is the latest version that has superseded 61A-W0078-A3-00. Our kit is a compatible replacement for all of these versions, ensuring you receive the correct components.

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.