Mercury – Quicksilver 8M2005029 Gimbal Housing Seal Kit | MerCruiser R/MR/Alpha/Bravo Series | Marine Seal Components | 8M2005029

Overview

Anyone who’s owned a sterndrive long enough knows there are a few parts you don’t mess around with—and the gimbal housing seals are near the top of that list. When they’re fresh and tight, you can feel that confidence every time you shift into gear or ease your boat into a tight marina slip. The Quicksilver 8M2005029 Gimbal Housing Seal Kit gives you that peace of mind. It’s the kind of kit you install once, take a deep breath, and know your driveline is protected from the water and wear that can sneak up on even seasoned boat owners.

Key Features

• Seals the upper swivel shaft on MerCruiser sterndrive transom assemblies.
• Built with high-grade marine sealing materials for lasting protection.
• Designed specifically for R, MR, Alpha One, Alpha One Gen II, and Bravo transoms.
• Precision-fit components match Mercury Marine part number 8M2005029.
• Straightforward installation using common tools.
• Helps maintain proper alignment and driveline integrity.

Engine & Boat Compatibility

• For MerCruiser R, MR, Alpha, Alpha One Gen II, and Bravo sterndrives
• Fits a wide range of power options from small-block sterndrive setups to larger V-series engines
• Commonly found on:
  • Family runabouts
  • Bowriders
  • Classic fiberglass cruisers
  • Performance sterndrive boats
  • Fishing and utility boats equipped with MerCruiser transoms

Performance & Practical Benefits

A good seal is something you don’t think about until you lose it. With this Mercury Marine part, you’ll instantly feel the difference in the boat’s handling and responsiveness. By keeping water out and supporting proper shaft movement, the kit helps prevent corrosion, misalignment, and the kind of hidden damage that can turn a weekend project into a boat-yard bill.

The fitment is tight and clean—no sloppy edges, no guessing. Once installed, the swivel shaft moves with a smooth, predictable feel, especially when trimming up or down in choppy water. That steadiness shows up in the helm, too. The boat feels more connected, more willing to follow your lead, and less prone to vibration or wandering at lower speeds.

Durability is where this kit shines. These seals are engineered for constant movement, sustained pressure, and the unique challenges of a marine environment. Whether you're running in freshwater or dealing with the harsher demands of saltwater, they hold up without swelling, cracking, or breaking down prematurely. Once in place, they protect your transom assembly season after season with minimal upkeep.

Why Buy OEM

A gimbal housing seal isn’t an area where you want to gamble on aftermarket. Mercury Marine parts are built to exact tolerances, tested for the kind of stress that marine conditions throw at them, and designed to work seamlessly with the factory transom assembly. Using the OEM kit ensures proper alignment, better long-term reliability, and fewer chances of water intrusion. It’s simply the smarter choice if you want your sterndrive to last.

FAQ

Q1: Which engines or systems does the Gimbal Housing Seal Kit 8M2005029 fit?

It’s designed for MerCruiser R, MR, Alpha, Alpha One Gen II, and Bravo sterndrive transom assemblies.

Q2: What makes this better than aftermarket seal kits?

OEM precision, durability, and tested compatibility—especially in harsh marine environments.

Q3: How do I know if this is the right kit for my boat?

Check your sterndrive model. If you’re running R, MR, Alpha, or Bravo, this kit is the correct fit.

Q4: Can it be used in both saltwater and freshwater?

Absolutely. It’s engineered for long-term sealing performance in both environments.

Q5: Is installation straightforward?

Yes. Most owners with basic mechanical skills and common tools can install it confidently.