MerCruiser Alpha One Gen ll Lower Gear casing mounting nut 11-817618 11-859135

Lower Gear Casing Mounting Nut for MerCruiser

This lower gear casing mounting nut for MerCruiser Alpha One Gen II outdrives secures the lower unit to the upper assembly, with OEM cross-reference numbers 11-817618 and 11-859135.

Overview

This mounting nut is an essential component for the MerCruiser Alpha One Gen II sterndrive, holding the lower gear casing firmly in place. It matches the original OEM part and ensures proper torque retention, keeping your drive assembly secure during operation.

Built For Performance

• Precision engineered to fit MerCruiser Alpha One Gen II lower gear casing
• Constructed from high-strength steel for reliable retention
• Threads match OEM specifications for easy installation
• Corrosion-resistant finish for marine environments
• Replaces worn or damaged mounting nuts to prevent gear misalignment

Fits These Machines

• for MerCruiser Alpha One Gen II sterndrive

On-The-Job Use

• Secure lower gear casing during drive assembly
• Replacement during routine maintenance or rebuild
• Ensures proper alignment of the driveshaft and gears
• Used in both fresh and saltwater boating applications

Specs At A Glance

Good To Know

Q: Why is this nut important? A: It holds the lower gear casing to the upper unit, preventing vibration and potential gear damage.

Q: Can I reuse the old nut? A: It's recommended to replace the nut whenever you service the lower unit to ensure proper torque and thread integrity.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.