YAMAHA Water Pump Repair 61A-W0078-A4-00 OEM outboard replacement, corrosion-resistant impeller and seals

Yamaha Water Pump Repair #61A-W0078-A4-00 is a factory-design replacement component engineered to restore cooling circulation in compatible Yamaha outboard engines.

This repair item is supplied to help return an outboard’s water-pumping system to reliable operation after wear, impeller degradation, or housing damage. The part follows Yamaha engineering tolerances and is intended for use where the exact part number is specified by Yamaha service documentation or a certified technician. Installing the correct replacement helps maintain designed engine temperature management and supports long-term engine reliability when fitted and inspected properly.

What does this Yamaha water pump repair part replace?

This part is intended to replace the water pump assembly components specified by Yamaha under part number 61A-W0078-A4-00. It replaces worn or failed pump parts that impede coolant flow.

• Replaces the specified Yamaha water pump assembly or its serviceable components.
• Addresses common wear points such as impeller blades and seals.
• Restores intended flow rates when installed per service instructions.

How do I install the 61A-W0078-A4-00 water pump repair part?

Installation should follow Yamaha service manual procedures or be carried out by a qualified marine technician. Basic steps include draining the cooling circuit, removing the old pump components, fitting the replacement parts with correct orientation, then testing the system for proper flow and leaks.

• Drain coolant and remove necessary engine covers to access pump housing.
• Replace impeller, seals, and gaskets per the manual’s torque and alignment specs.
• Refill and run engine at low throttle to verify steady water discharge and no leaks.

What materials and quality features does this Yamaha repair part include?

The part is produced to Yamaha’s factory standards, using materials selected for marine durability and resistance to corrosion and abrasion. Components are matched to original design dimensions to preserve pump performance.

• Precision-molded impeller geometry for consistent flow.
• Seals and gaskets formulated for saltwater and freshwater environments.
• Machined housings or fittings that align with OEM tolerances.

How can I confirm compatibility with my boat's engine?

Match the engine serial/model information and Yamaha parts catalog reference to this part number. If in doubt, consult an authorized Yamaha dealer or the official service manual for your engine year and model.

• Compare your engine’s parts list with part number 61A-W0078-A4-00.
• Provide engine model and serial to a Yamaha dealer for verification.
• Check fitment notes in the official Yamaha parts catalog before purchase.

Who is this for: This Yamaha Water Pump Repair part suits boat owners, marine mechanics, and service shops needing a genuine OEM-specified replacement for cooling components on compatible Yamaha outboards. It is targeted at anyone following manufacturer-recommended servicing or restoring water-circulation performance without resorting to non‑OEM substitutes.