Description
SIERRA OMC Propeller Shaft Oil Seal – 18-2012
Gearcase oil seal for selected OMC/Johnson/Evinrude drive applications. It is commonly used as a propeller-shaft sealing component to retain gear lubricant and exclude water from the lower unit.
- Gearcase oil seal
- Common propeller-shaft sealing application
- Helps retain gear oil and exclude water
- Replace when resealing lower unit or servicing shaft
- Match OEM number and seal orientation before installation
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: 18-2012
- Application: Selected OMC/Johnson/Evinrude gearcases using OEM oil-seal numbers 310599 / 308715; verify gearcase before installation.
Interchange / OEM References
- OMC 310599
- OMC 308715
- GLM 85110

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