RPS Gimbal Bearing 30-60794A4 – Greasable Sterndrive Replacement, OEM Fit

The RPS 30-60794A4 greasable gimbal bearing is a direct-fit sterndrive alignment bearing designed to replace OEM MerCruiser, OMC, and Volvo Penta gimbal bearings for reliable shaft support and serviceable lubrication.

This greasable gimbal bearing from RPS is built to match the fit and function of common OEM part numbers used across MerCruiser, OMC, and Volvo sterndrives. It restores proper propeller shaft alignment and allows routine maintenance thanks to its greaseable design — provided your transom has a grease zerk. Before ordering, compare OEM numbers, drive model, and serial ranges to confirm compatibility.

How does this bearing restore sterndrive alignment?

The bearing replaces worn or failed gimbal bearings that let the propeller shaft wobble or sit out of alignment. Proper alignment reduces vibration, wear on seals and coupling components, and improves drivetrain longevity. Installation returns the shaft to its intended centerline.

• Direct-fit replacement for MerCruiser 30-60794A4 and related OEM numbers
• Compatible with OMC Cobra/King Cobra and Volvo Penta SX models
• Precision inner bore to maintain shaft centerline
• Greaseable design for periodic maintenance and extended service life

Which engines and drives will this RPS part fit?

This bearing is intended for a range of sterndrive applications: classic MerCruiser Alphas (first generation), Bravo, OMC Cobra families, and many Volvo Penta drives. Cross-reference OEM numbers and model years to ensure proper match for your transom and drive type.

• Fits MerCruiser Alpha Gen 1 & Gen 2, Bravo, MC-1 / R / MR
• Used on OMC Cobra and King Cobra drives
• Compatible with Volvo Penta SX drive applications
• See OEM interchange: OMC 983937, Volvo 3853807, and aftermarket Sierra 18-2100

What maintenance and installation notes should I know?

This is the greasable type of gimbal bearing, so a grease zerk (fitting) on the transom is required for proper lubrication. Follow manufacturer torque specs during installation and verify clearance and shaft rotation before final assembly to prevent premature wear.

• Requires transom grease zerk for routine lubrication
• Inspect shaft, seals, and surrounding housings during replacement
• Use recommended marine grease and service intervals per drive maker
• Confirm fit by cross-referencing OEM and aftermarket numbers

How do I confirm this is the correct replacement for my boat?

Compare your existing bearing’s part number, drive model, and production year to the OEM cross references. If you’re unsure, remove the old bearing and match dimensions and reference numbers or consult a qualified marine technician to avoid ordering the wrong part.

• Verify OEM numbers: MerCruiser 30-60794A4 (and related variants)
• Check OMC and Volvo cross-references: OMC 983937, Volvo 3853807
• Confirm drive type (Alpha, Bravo, Cobra, SX) and serial range
• Measure inner bore and outer housing if OEM marking is worn

Who this is for: Boat owners, marine technicians and restoration shops replacing worn sterndrive gimbal bearings on MerCruiser, OMC or Volvo installations who want a serviceable, greaseable aftermarket bearing that follows common OEM interchange numbers. It’s especially suited to vessels that accept a zerk-fitting for regular lubrication and owners who prioritize straightforward maintenance and correct fitment over generic replacements.