Description
SIERRA Mercury / MerCruiser 0.375 in. Shaft Oil Seal – 18-2009
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 Mercury and MerCruiser drive/gearcase applications using the listed 26-series OEM seals.
- 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 Mercury and MerCruiser drive/gearcase applications using the listed 26-series OEM seals.
Specifications
- Component: Marine oil / shaft seal
- Outside diameter: 0.750 in.
- Shaft size: 0.375 in.
- Width: 0.250 in.
Interchange / Replaces
- GLM: 85050
- Mallory: 9-76105
- MerCruiser: 26-31249, 46021, 89236, 892361
- Mercury: 26-25776, 26-31249, 26-89236

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