The Stainless Steel Prop Shaft Conical Spring Washer is an essential part of the Mercury Marine and Racing Hub Kits, designed for high-performance HD Mercury outboards and MerCruiser sterndrives.
Compatible with gearcases like the CLE (Cresent Leading Edge) and Sportmaster (SM), it is integral to fat shaft 2-stroke outboards including the 260 EFI, Offshore 280 ROS, 300 Drag, 300 Pro Max, 300X, 300XS, and modern 4-stroke outboards such as the 250R, 300R, 400R, 450R and 500R. It also fits Fleetmaster, Verado 5.25” gearcases, and MerCruiser Bravo 1 XR and XZ sterndrives.
The prop shaft spring washer plays a critical role in maintaining the performance and integrity of your propeller assembly.
1) It provides preload tension, ensuring the propeller remains secure and properly aligned during operation.
2) By absorbing vibrations and shocks, it protects both the propeller and shaft from potential damage. As components wear down over time, the spring washer compensates for wear, maintaining proper tension and alignment.
3) Its constant force also prevents nuts and bolts in the assembly from loosening under the engine’s vibrations and rotational forces.
4) The 18-8 Stainless Steel provides excellent resistance to rust, making these washers ideal for marine, and boating applications.
The spring washer is located between the propeller and thrust washer on the propeller shaft and must be oriented correctly to ensure effective preload and tension. Proper installation is crucial. Misinstallation can result in misalignment and damage to the propeller assembly.
This kit includes one (1) Prop Shaft Conical Spring Washer, designed for durability and regular replacement. Select buy 3, to save $3.
Changing the washer annually or as part of routine maintenance is recommended to maintain optimal performance.
This washer replaces Mercury/Quicksilver OEM part numbers 840389A1, 840389A2, 840389A5, 840389K06, 840389K5, 840389Q06, and 12-840383A2.
Keep your high-performance outboard or sterndrive operating at its peak with this essential component, designed for durability and reliability in demanding marine environments.vil