GHmarine Transom Bellows & Gimbal Bearing Kit for MerCruiser Alpha 1 Gen1 — Full Seal Repair Kit (fits 1983–1990, includes clamps

GHmarine 30-803097T1 is a full transom bellows and gimbal bearing replacement kit made to restore water and exhaust seals on MerCruiser Alpha 1 Gen 1 drives.

If your MerCruiser Alpha 1 drive (Gen 1) shows signs of bellows wear, exhaust leaks, or loose gimbal bearings, replacing the rubber components and bearing as a set removes guesswork and reduces rework. This kit collects the rubber bellows, water lines, clamps, gaskets and the gimbal bearing needed to refresh the gimbal housing and transom seals for specified Alpha 1 models and serial ranges.

Which engines and serial numbers does this kit fit?

This kit is designed for early MerCruiser Alpha 1 Gen 1 drives and select Alpha 1 SS models within stated serial ranges. Confirm your boat’s model and serial number before ordering to ensure compatibility.

• Fits MerCruiser R, MR, Alpha 1 (1983–1990) starting at serial 6225577
• Fits Alpha 1 SS (1986–1989) starting at serial OA 545004
• Replaces OEM references including 30-803097T1 and Sierra 18-2601-1
• Contact seller with model, horsepower or year if unsure

What components are included and what do they replace?

The kit bundles all rubber components and the gimbal bearing so you replace every wear item in the gimbal housing and transom run. Each listed piece matches common OEM part numbers to make installation straightforward and reduce parts hunting.

• "U" joint bellows assembly — replaces OE 60932A4
• Exhaust bellows — replaces OE 32734A3 and 18654A1
• Water hoses in 5/8" and 3/4" sizes — replace OE 32-32461 and 32-41725
• Shift bellows — replaces OE 74639; includes all stainless clamps
• Gimbal bearing — replaces OE 30-60794A4 and includes gasket kit 27-94996T2

How will installing this kit affect drive performance and maintenance?

Replacing worn bellows and the gimbal bearing restores sealed protection against water ingestion and exhaust leaks at the transom, reducing corrosion risk and preventing premature drivetrain damage. Completing the full set at once eliminates staged repairs and helps maintain correct hose routing and clamp pressure.

• Seals out water to protect internal U-joint and u-bend areas
• Prevents exhaust leaks that can accelerate rubber deterioration
• Stainless clamps resist corrosion and hold correct clamp torque
• New gimbal bearing reduces shaft play and improves alignment

What should I check before buying and installing this kit?

Verify your drive model, serial number and year before purchasing — this ensures the kit matches the geometry and OEM references on your drive. Also inspect surrounding components (bell housing, transom mounting, driveshaft splines) and plan for basic tools and sealant needed during installation.

• Confirm drive model (R, MR, Alpha 1, Alpha 1 SS) and serial number ranges
• Inspect transom and bell housing for cracks or excessive corrosion
• Prepare standard marine tools, sealant and torque specs for clamps
• Consider replacing related fasteners if heavily corroded

Who is this for: This GHmarine kit is aimed at boat owners, mechanics and restoration professionals working on MerCruiser Alpha 1 Gen 1 drives who want a single-purchase solution for all rubber parts and the gimbal bearing. It suits anyone doing preventative maintenance or repairing water/exhaust leaks on compatible vintage MerCruiser units who prefers OEM-referenced replacements and stainless mounting hardware.