Description

Mercury MerCruiser / Quicksilver Replacement Part – 8M2011027

The Mercury Marine / Quicksilver 8M2011027 is a bearing carrier retaining nut (retainer / spanner nut) used in the lower unit or sterndrive gearcase of certain Mercury and MerCruiser engines. Its function is to secure the bearing carrier inside the gear housing, keeping internal drivetrain components properly aligned and sealed.

Key Features

• Genuine Mercury / Quicksilver OEM retaining nut

• Secures the bearing carrier in the lower unit / gearcase

• Maintains proper alignment of gears and drivetrain components

• Designed for sterndrive and high-horsepower outboard lower units

• Built to withstand marine drivetrain loads and vibration

Superseded / Replacement Part

• 8M2011027 → superseded by 8M0168577 (current replacement part number).

Cross Reference

• Mercury 79448

• Mercury 8M2000347

• Sierra / aftermarket equivalents available depending on manufacturer.

Compatible Mercury / MerCruiser Applications

Commonly used on Mercury outboards and MerCruiser sterndrives, including:

• Verado outboards (approx. 135–300 HP)

• MerCruiser Bravo I and Bravo II sterndrives

• Certain Alpha, Vazer, and other sterndrive gearcases depending on configuration.

Function in the Drive System

The retainer nut holds the bearing carrier assembly in the gear housing, which supports the propeller shaft bearings and seals. Proper installation ensures drivetrain stability and prevents internal gear movement or seal failure.

Important Compatibility Note

Lower-unit hardware varies by drive model, engine horsepower, and serial number range. Always verify compatibility using the engine or sterndrive serial number before ordering.