Description
SIERRA Greasable Gimbal Bearing for MerCruiser Alpha One Gen II/Bravo – 18-21005 is a serviceable replacement gimbal bearing for later MerCruiser Alpha One Gen II and Bravo transom assemblies.
The bearing retains the greasable configuration for applications designed to receive periodic lubrication through the transom assembly. Confirm the bearing style before replacing a permanently lubricated unit.
Key Features
- Greasable serviceable bearing design
- Fits Alpha One Gen II applications from 1998 and later
- Fits MerCruiser Bravo drive applications
- Direct marine replacement for listed MerCruiser bearing assemblies
- Designed for transom assemblies retaining the grease-service system
Specifications
- Manufacturer Part Number: 18-21005
- Product Type: Gimbal bearing
- Lubrication: Greasable
- Primary Fitment: Alpha One Gen II 1998-up / Bravo
- Application: MerCruiser sterndrive transom assembly
Interchange / Cross Reference
- MerCruiser 30-862540A3
- MerCruiser 30-879194A01
- MerCruiser 30-862540T1
- MerCruiser 30-862540A04
- Mallory 9-72412
Confirm greasable versus permanently lubricated bearing configuration before installation.

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