Description
SIERRA Mercury/MerCruiser Gearcase Oil Seal – 18-2013
Replacement oil seal for selected Mercury and MerCruiser drive applications. It is used in the gearcase/upper-drive sealing system and should be renewed whenever the mating shaft or housing is serviced.
- Marine gearcase oil seal
- For selected Mercury/MerCruiser applications
- Helps retain lubricant and exclude water
- Use correct lip orientation during installation
- Verify OEM number before ordering
For marine engine and drive parts, fitment can vary by serial number, gear ratio, casting, or prior service history. Compare the original part number and physical configuration before installation; replace related gaskets, seals, races or hardware when their condition requires it.
Specifications
- Manufacturer: Sierra
- Part Number: 18-2013
- Application: Selected Mercury/MerCruiser applications using OEM seal 26-16977.
Interchange / OEM References
- Mercury / MerCruiser 26-16977
- GLM 85040

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