Yamaha - Propeller Shaft - Lower Unit Component - 66T-45611-00-00

Overview

The prop shaft is where all that engine power finally meets the water, so when something’s off here, you’ll feel it right away. I’ve seen bent or worn shafts cause vibration, seal issues, and even gear damage if left unchecked. It’s one of those parts that takes a beating, especially if you’ve ever bumped bottom or picked up debris. Keeping a straight, solid shaft in place is key to smooth performance and protecting the rest of your lower unit.

Key Features

• Direct Power Transfer – Delivers engine torque straight to the propeller for reliable performance.
• Precision Machined Shaft – Ensures smooth rotation and proper alignment within the lower unit.
• High-Strength Construction – Built to handle load, impact, and continuous operation.
• Seal Surface Integrity – Designed to work with seals to help prevent water intrusion.
• OEM Fit and Function – Matches Yamaha specifications for proper installation and durability.

Engine & Boat Compatibility

• Designed for Yamaha outboard engines with gear-driven lower units
• Compatible with a range of small to mid-range horsepower models
• Suitable for both freshwater and saltwater applications
• Commonly used in lower unit repair and rebuilds

FAQ

Q: What are the signs of a damaged propeller shaft?
A: Vibration, leaking gear oil, difficulty turning the prop, or visible wobble are common signs.

Q: Can a bent shaft damage other parts?
A: Yes, it can wear out seals, bearings, and gears if not addressed quickly.

Q: What usually causes prop shaft damage?
A: Striking debris, running aground, or heavy impact with objects in the water.

Q: Is this a repair I can do myself?
A: It’s a more involved job that usually requires disassembling the lower unit, so experience helps.

Q: Does saltwater use affect this part?
A: Yes, especially if seals fail—saltwater intrusion can lead to corrosion inside the unit.