6H4-W0078-00 Water Pump Impeller Repair Kit for Yamaha 40/50 HP Sierra 18-3429

Water Pump Impeller Repair Kit for Yamaha

This water pump impeller repair kit is designed for Yamaha 40/50 HP outboard motors, providing all necessary components to restore cooling performance. It replaces OEM part number 6H4-W0078-00 and Sierra 18-3429.

Overview

This water pump impeller repair kit includes the impeller, gaskets, and seals needed to service your Yamaha outboard's water pump. Built for Yamaha 40/50 HP engines, it matches original part numbers 6H4-W0078-00 and Sierra 18-3429. Keep your engine running cool with this reliable water pump impeller repair kit.

Built For Performance

• Includes impeller, gaskets, and seals for a complete repair
• Precision-molded impeller blades for consistent water flow
• High-quality rubber compound resists wear and heat
• Direct replacement for Yamaha 6H4-W0078-00 and Sierra 18-3429
• All necessary hardware included for a straightforward install

Fits These Machines

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

On-The-Job Use

• Replacing worn impellers during routine maintenance
• Restoring water flow in saltwater or freshwater environments
• Used by marine technicians and DIY boaters
• Ideal for seasonal tune-ups before summer launch

Specs At A Glance

Good To Know

Q: How do I know if my water pump impeller needs replacement? A: Signs include overheating, reduced water flow from the tell-tale, or visible wear on the impeller blades during inspection.

Q: Can I install this kit myself? A: Yes, with basic mechanical skills and a service manual, most boaters can replace the impeller in under an hour.

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