Quicksilver 8M0171142 U-Joint Seal Carrier Assembly for MerCruiser Bravo Sterndrive

The Quicksilver 8M0171142 U-Joint Seal Carrier Assembly is a genuine OEM replacement part designed to maintain the integrity of MerCruiser Bravo I, II, and III sterndrive systems. This carrier assembly installs in the upper gear housing and forms a critical watertight barrier that prevents water intrusion and gear oil leakage from reaching the internal components of the upper gearcase.

Over time, heat, wear, and debris exposure can degrade the original seal, allowing moisture to enter the gearcase and gear oil to escape. A compromised seal can lead to milky gear oil, corrosion, overheating, and ultimately costly gear failure. Replacing this carrier assembly as part of routine sterndrive maintenance is an effective way to protect the drivetrain and extend the service life of your Bravo outdrive.

Key Features:

• Genuine Quicksilver OEM part — built to Mercury Marine factory specifications
• Prevents water intrusion and gear oil leakage at the upper gear housing
• Direct-fit replacement requiring no special tools or modifications
• Compatible with MerCruiser Bravo I, II, and III sterndrive upper gearcases
• Replaces legacy OEM part number 86779A1
• Durable construction suited for harsh saltwater and freshwater marine environments

This assembly is also commonly referenced by OEM part numbers 86779A1 and 8M0171142. Recommended for inspection and replacement any time the sterndrive is serviced or whenever gear oil contamination or leaking is detected around the input shaft area.