Yamaha - Propeller Shaft - Lower Unit Drivetrain Component - 68T-45611-00-00

Overview

The prop shaft is one of those parts that quietly takes a beating every time you throttle up. It’s transferring all that engine power straight to the prop, so it needs to stay true and strong no matter how hard you run it. When one of these gets even slightly bent or worn, you’ll feel it in the water right away—vibration, noise, or inconsistent performance. This is the kind of component you replace once and expect to forget about for a long time.

Key Features

• High-Strength Steel Build – Handles continuous torque load from the engine without flexing under pressure.
• Precision Machined Splines – Ensures proper prop engagement and smooth power delivery.
• True Running Alignment – Designed to minimize vibration and maintain balance at all speeds.
• OEM Fit and Finish – Matches Yamaha factory specs for dependable installation and operation.

Engine & Boat Compatibility

Yamaha Outboard Models – Varies by application (confirm by part number)

FAQ

Q: What are the signs of a bent or damaged propeller shaft?
A: You’ll usually feel vibration through the boat, especially at speed, or notice uneven prop rotation.

Q: Can I keep running if the shaft is slightly bent?
A: It’s not recommended. Even a small bend can lead to seal damage and bigger lower unit issues.

Q: What usually causes a prop shaft to fail?
A: Impact with debris, grounding, or running a damaged prop are the most common causes.

Q: Do I need special tools to install this shaft?
A: Yes, proper tools and measurements are important to ensure correct reassembly and alignment inside the lower unit.

Q: How does saltwater use affect the prop shaft?
A: Corrosion can build up over time if not maintained, especially around seals and splines, so regular inspection helps.