Description
SIERRA MerCruiser Sterndrive Oil Seal – 18-2094
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 MerCruiser 120/140, 165, 228/260/485/898 families and Alpha/Bravo drive assemblies using OEM 26-36143 or 26-88416.
- 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 MerCruiser 120/140, 165, 228/260/485/898 families and Alpha/Bravo drive assemblies using OEM 26-36143 or 26-88416.
Specifications
- Component: Marine oil / shaft seal
- OEM application: MerCruiser sterndrive oil seal
- Drive families: Selected R/MR/Alpha One/Gen II/Bravo I-II-III
Interchange / Replaces
- GLM: 85910
- Mallory: 9-76230
- MerCruiser: 26-36143, 26-88416

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