Description
SIERRA OMC Stern Drive U-Joint Shaft Bearing – 18-1171
U-joint shaft bearing for selected OMC stern drives. This bearing supports the U-joint/drive shaft assembly and is used during upper-drive service when bearing roughness, play or corrosion is found.
- U-joint shaft support bearing
- For OMC stern-drive upper-drive service
- Precision replacement for OEM 983878
- Inspect shaft and housing condition during replacement
- Verify drive model 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: 18-1171
- Application: Selected OMC stern-drive applications using OEM bearing 983878.
Interchange / OEM References
- OMC 983878
- GLM 21543

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