Water Pump Impeller Kit For Yamaha Outboard 255-300HP - 6P2-W0078-00-00, 18-3515

Water Pump Impeller Kit for Yamaha

This water pump impeller kit is a direct replacement for Yamaha outboard engines rated 255-300HP, referencing OEM cross-reference numbers 6P2-W0078-00-00 and 18-3515.

Overview

This water pump impeller kit is designed to restore cooling system performance on high-output Yamaha outboard motors. It includes the impeller, housing gaskets, and seals needed for a complete water pump rebuild. Boaters relying on Yamaha 255-300HP outboards will find this kit an essential maintenance item.

Built For Performance

• Precision-molded neoprene impeller blades deliver consistent water flow
• Stainless steel insert resists corrosion in marine environments
• Includes new housing gasket and o-ring for a leak-free seal
• Direct fit replacement for OEM part numbers 6P2-W0078-00-00 and 18-3515
• Tested for durability under continuous high-RPM operation

Fits These Machines

• for Yamaha F250 outboard (2005-2012)
• for Yamaha F300 outboard (2010-2018)
• for Yamaha 250-300HP V6 outboards
• for Yamaha HPDI 250-300HP models

On-The-Job Use

• Annual water pump replacement on saltwater fishing boats
• Rebuilding cooling system on freshwater cruisers
• Restoring cooling efficiency after overheat incidents
• Preventive maintenance on high-hour commercial outboards

Specs At A Glance

Good To Know

Q: How often should I replace my outboard's water pump impeller? A: It is generally recommended every 200-300 hours or once a year, whichever comes first, to prevent overheating and ensure reliable cooling.

Q: Does this kit include the housing? A: No, this is an impeller kit containing the impeller, gaskets, and seals; the housing is reused or purchased separately.

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