Water Pump Repair Kit 6AW-W0078-00-00 18-3477 for Yamaha Outboard 300&350HP V8

Water Pump Repair Kit for Yamaha

This water pump repair kit for Yamaha outboards supplies the essential parts to rebuild the cooling system water pump; it cross-references OEM part numbers 6AW-W0078-00-00 and 18-3477.

Overview

This water pump repair kit is built for Yamaha 300HP and 350HP V8 outboard engines. Designed to restore cooling system pressure, the water pump repair kit includes the essential wear components needed for a reliable rebuild. It suits boat owners and technicians maintaining high-horsepower Yamaha four-stroke outboards.

Built For Performance

• Engineered for Yamaha 300HP and 350HP V8 outboard cooling systems
• Includes replacement water pump components for a complete repair
• Cross-references OEM part numbers 6AW-W0078-00-00 and 18-3477
• Supports high-output V8 outboard operation
• Helps prevent overheating and cooling system failure

Fits These Machines

• for Yamaha 300HP V8 outboards
• for Yamaha 350HP V8 outboards

On-The-Job Use

• For replacing a worn water pump impeller during routine outboard service
• For repairing overheating issues in Yamaha 300HP and 350HP V8 outboards
• For use in saltwater and freshwater cooling systems
• For preventive maintenance before boating season

Specs At A Glance

Good To Know

Q: How does this water pump repair kit fit a Yamaha outboard? A: Fit depends on the outboard's exact model and serial number. This kit cross-references 6AW-W0078-00-00 and 18-3477 for Yamaha 300HP and 350HP V8 engines.

Q: What does a water pump repair kit include? A: It includes the impeller and sealing components needed to rebuild the water pump. Replacing these parts helps maintain proper engine cooling.

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