MerCruiser Alpha Input Shaft Seal and Carrier Assy (8M0171103)

MerCruiser Alpha Input Shaft Seal and Carrier Assembly

The MerCruiser Alpha Input Shaft Seal and Carrier Assembly is a critical component that protects your sterndrive’s upper gearcase from oil leaks and water intrusion. Designed specifically for Alpha One Gen I and Gen II drives, this assembly maintains a tight seal around the input shaft, helping to ensure smooth, trouble-free performance on the water.

Essential for Leak Prevention

Over time, seals wear out—especially in high-stress marine environments. When this happens, water can enter your gearcase and mix with the oil, leading to internal corrosion and gear damage. The input shaft seal and carrier assembly creates a strong, reliable barrier that keeps gear oil in and water out.

Precision Fit and OEM Reliability

This part is manufactured to OEM specifications for a direct fit on MerCruiser Alpha sterndrives. The precision-machined carrier ensures proper alignment and a secure hold, while the high-quality seal maintains long-term performance under heat and pressure. Whether you’re doing preventive maintenance or fixing a known leak, this part restores factory-level sealing integrity.

Durable Construction for Marine Conditions

Built with corrosion-resistant materials and designed to endure harsh marine environments, the Alpha input shaft seal and carrier withstand both freshwater and saltwater use. It’s engineered to handle the constant motion, vibration, and torque associated with sterndrive systems.

Easy Installation, Long-Term Protection

This assembly installs directly into the upper gear housing with basic tools. Replacing a worn or leaking seal now can prevent major repairs later—saving you time, money, and frustration. Whether you’re a DIY boater or a marine technician, this part offers a straightforward solution to a potentially costly problem.

Why Choose the Alpha Input Shaft Seal and Carrier?

A small leak can lead to big damage. This MerCruiser Alpha Input Shaft Seal and Carrier Assembly is a smart, affordable way to protect your drive system. With a precise fit and rugged construction, it’s a must-have for any sterndrive owner focused on reliability and performance.

Follow us on Facebook, Instagram and Youtube.

Terms & Conditions | Returns & Exchanges | Privacy Policy