OMC 175266 PROPELLER SEAL KIT

Function and Technical Context

The propeller locking kit acts as a fastening and sealing assembly that securely anchors the propeller to the drive shaft, preventing the torque generated by the engine from causing play or loosening of the hub during navigation. It operates within the propulsion system, specifically at the junction between the propeller shaft and the propeller, serving as the final mechanical barrier that ensures the full transmission of thrust to the water. Its deterioration directly compromises propulsive efficiency: a poor fit causes micro-movements between the hub and the shaft that accelerate wear on both components and can lead to the complete loss of the propeller while underway. This kit is compatible with OMC engines under part number 175266 and with Mercury, Mariner, and MerCruiser engines under part numbers 802009 and 802009Q1, making it a widely applicable part across the range of outboard and inboard propulsion systems from these brands.

When should this part be replaced?

The clearest signs that the propeller lock kit has reached the end of its service life are: abnormal vibration noticeable at the stern as RPM increases, detectable play when moving the propeller with the engine stopped and turned off, or visible corrosion, deformation, or cracks in the fasteners when removing the boat from the water. It is recommended to inspect this assembly during every dry docking or seasonal service, as continuous exposure to saltwater and torsional stresses accelerate its degradation. Given the low cost of the kit relative to the risk posed by a propulsion failure at sea, the professional recommendation is to replace it as a preventive measure whenever the propeller is removed for any other service.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer Part Numbers