Description
The Sierra 18-73918 Propeller Thrust Washer is a precision-engineered marine component primarily designed for Yamaha 75–250 HP outboard engines. It functions as a critical mechanical barrier that prevents the propeller from moving forward and making metal-on-metal contact with the engine's lower unit housing.
Key Specifications & Compatibility
- Engine Fitment: Primarily fits Yamaha F115–F200 (2004–2014) and other Yamaha V6 150–300 HP models (excluding D150).
- OEM Interchange: Replaces Yamaha part numbers 63P-45987-00-00, 6E5-45987-00-00, and 6E5-45987-01-00, as well as Mallory 9-73918.
- Material: Constructed from high-grade, corrosion-resistant hardened steel alloys or high-brass content metal to withstand harsh saltwater environments.
- Function: Manages axial loads to maintain propeller shaft alignment, reducing friction and preventing catastrophic gear or bearing failure.
Maintenance Tips
- When to Replace: Inspect your thrust washer annually or every 100 hours of operation. Replace immediately if you notice scoring, unusual whining, or excessive play in the driveshaft.
- Installation: Clean all mating surfaces thoroughly before installation. Apply a small amount of marine-grade assembly lube to the faces and torque to manufacturer specifications (typically 20–30 ft-lb).
