SIERRA 18-21001 Marine Gimbal Bearing for Mercruiser Alpha Up to 1997, Replaces Mercury 30-60794A2 / A4, Bravo, OMC Cobra

This product is a marine gimbal bearing designed for use in Mercruiser Alpha stern drives up to 1997, as well as select Bravo and OMC Cobra models. The SIERRA 18-21001 is a direct replacement for several Mercury OEM part numbers, making it a reliable choice for boat owners and marine mechanics seeking to restore smooth operation and reduce vibration in their vessel’s driveline.

Ideal for routine maintenance or repairs, this gimbal bearing helps ensure proper alignment of the propeller shaft, which is essential for optimal performance and longevity of your stern drive system. Its compatibility with both greaseable and non-greaseable designs adds flexibility for various setups.

• Fits Mercruiser Alpha (MC-1, R, MR, Alpha One & Gen II) stern drives up to 1997
• Also compatible with Bravo, OMC Cobra, and King Cobra drives
• Replaces Mercury OEM 30-60794A2, 30-60794A4, 30-879194A02
• Designed for smooth shaft alignment and reduced vibration
• Suitable for both greaseable and non-greaseable applications
• Perfect for routine maintenance or OEM replacement

Choose the SIERRA 18-21001 Marine Gimbal Bearing for a dependable upgrade or replacement, and keep your boat running smoothly on the water.