SIERRA Johnson/Evinrude/OMC 0.500 in. Shaft Oil Seal – 18-2025

Description

SIERRA Johnson/Evinrude/OMC 0.500 in. Shaft Oil Seal – 18-2025

A dimensional replacement rotary shaft/oil seal for the specified marine gearcase, sterndrive or engine assembly. Correct seal size and lip orientation are critical to retaining lubricant and excluding water.

• Application: Selected Johnson/Evinrude/OMC gearcase applications using OEM 0318972 / 318972.
• Dimensional marine replacement seal; match shaft and bore dimensions before installation.
• Replace damaged, hardened or leaking seals during gearcase/drive service rather than reusing old seals.
• Lubricate the seal lip as specified and install squarely without damaging the sealing edge.
• Confirm the OEM interchange and shaft location because visually similar Sierra seals may use different diameters or lip designs.

This is an application-specific marine service part. Confirm the engine or sterndrive model, serial range and OEM reference before installation.

Application: Selected Johnson/Evinrude/OMC gearcase applications using OEM 0318972 / 318972.

Specifications

• Component: Marine oil / shaft seal
• Outside diameter: 0.875 in.
• Shaft size: 0.500 in.
• Width: 0.250 in.

Interchange / Replaces

• Johnson/Evinrude/OMC: 0318972, 318972
• GLM: 86120
• Mallory: 9-76201