Yamaha - Propeller Shaft - Lower Unit Drivetrain - 6AX-45611-00-00

Overview

This is the backbone of your lower unit—the part that actually spins the prop and pushes you through the water. When it’s straight and solid, everything feels smooth and predictable. But once a shaft gets bent or worn, you’ll notice vibration, noise, or even seal issues pretty quick. Yamaha builds these to take real-world hits and torque, whether you're cruising long runs or working in rough conditions.

Key Features

• Direct Power Transfer – Carries engine torque straight to the propeller for consistent thrust.
• Precision Machined Fit – Built to exact tolerances for proper alignment inside the lower unit.
• High-Strength Construction – Designed to handle heavy loads, impacts, and continuous use.
• Seal Surface Integrity – Smooth surfaces help protect seals and reduce the risk of leaks.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units using this propeller shaft configuration. Commonly found in mid to high horsepower Yamaha engines where strength and smooth power delivery are critical.

FAQ

Q: What are signs of a damaged propeller shaft?
A: Vibration while running, uneven prop rotation, or leaking gear oil around the seals are common signs.

Q: Can a bent shaft be repaired?
A: In most cases, it’s better to replace it. Straightening doesn’t always restore proper balance or strength.

Q: What usually causes shaft damage?
A: Striking debris, running aground, or heavy impacts are the most common causes.

Q: Should I check anything else when replacing the shaft?
A: Yes, inspect seals, bearings, and the prop itself to make sure everything is still in good shape.

Q: Does saltwater use affect the shaft?
A: Over time, yes. Corrosion can build up if it’s not cleaned and maintained regularly.

• Supersessions
  6AX-45611-01-00, 6AX-45611-01-00