Sierra 18-0408 Outer Wear Plate for Yamaha Outboard Water Pump

The Sierra 18-0408 Outer Wear Plate is a precision-replacement water pump component designed for Yamaha outboard engines. It serves as a direct replacement for Yamaha OEM part number 65N-44323-00 and is a key element of the water pump assembly in the lower unit cooling system.

The outer wear plate seats at the base of the water pump cartridge, protecting the impeller housing from abrasion and maintaining the tight tolerances necessary for efficient water flow. Replacing a worn or damaged wear plate during routine impeller service helps restore proper cooling performance and prevents premature wear on other pump components.

Key Features:

• Direct replacement for Yamaha OEM part number 65N-44323-00
• Engineered to meet or exceed OEM specifications for fit and performance
• Commonly serviced as part of water pump repair kits including Sierra 18-4533
• Compatible with Sierra water pump repair kits for Yamaha outboard applications
• Backed by Sierra's limited lifetime warranty against defects in materials and workmanship

This wear plate is also listed in Sierra water pump kit 18-4533, which replaces Yamaha kit 65N-W0078-A0-00. For best results, replace the outer wear plate any time the impeller is serviced to ensure optimal sealing and cooling efficiency.