Water Pump Impeller Kit For Yamaha 6H4-W0078-00 40HP 50HP Sierra18-3429 Outboard

Water Pump Impeller Kit for Yamaha

This water pump impeller kit is a replacement cooling system part for Yamaha 40HP and 50HP outboard engines, referencing OEM part number 6H4-W0078-00 and cross-referencing for Sierra 18-3429, and it supplies the impeller components needed to keep cooling water circulating through the outboard.

Overview

This water pump impeller kit for Yamaha 40HP and 50HP outboards is a new outboard cooling water pump service kit. It replaces OEM part number 6H4-W0078-00 and matches for Sierra 18-3429. The kit is intended for marine mechanics and boat owners performing routine outboard water pump maintenance.

Built For Performance

• Replaces OEM part number 6H4-W0078-00
• Cross-references for Sierra 18-3429
• Designed for Yamaha 40HP and 50HP outboard engines
• Kit includes the water pump impeller for the cooling system

Fits These Machines

• for Yamaha 40HP outboard engines
• for Yamaha 50HP outboard engines

On-The-Job Use

• Replacing a worn water pump impeller for Yamaha 40HP outboards
• Replacing a worn water pump impeller for Yamaha 50HP outboards
• Performing scheduled water pump service on outboard motors
• Restoring pee-tube cooling water flow and engine cooling performance

Specs At A Glance

Good To Know

Q: How often should a water pump impeller be replaced? A: Impellers should typically be replaced when the outboard shows reduced cooling water flow or during scheduled water pump maintenance. This kit provides the impeller components for that service.

Q: Why is the impeller important for an outboard? A: The impeller draws water into the cooling system to prevent the engine from overheating. Replacing it regularly helps maintain reliable outboard operation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.