Yamaha - Gear 2 (28 Tooth) - Lower Unit Gear Train - 6EH-45571-00-00

Overview

When you open up a lower unit and find worn or chipped gears, it’s never a small job—but it’s one that has to be done right. This gear is part of what keeps power moving cleanly from the driveshaft down to the prop. I’ve seen even minor wear here turn into noise, slipping, or worse if it’s ignored. With a solid gear back in place, everything runs quieter and smoother like it should.

Key Features

• 28 Tooth Gear Design – Precisely cut teeth ensure proper engagement within the gear train.
• Smooth Power Transmission – Helps deliver consistent torque through the lower unit.
• Hardened Metal Construction – Built to handle load, friction, and long-term operation.
• Reliable Gear Engagement – Supports clean meshing with adjacent gears to reduce wear.
• Exact Yamaha Fitment – Designed to match factory specifications for proper alignment and function.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units utilizing internal gear train systems. Commonly used across a range of Yamaha outboards in recreational and commercial marine applications. Suitable for freshwater and saltwater environments where dependable power transfer is essential.

FAQ

Q: What are signs this gear is worn or damaged?
A: Grinding noises, metal in gear oil, or slipping under load are common indicators.

Q: Do I need to replace other gears at the same time?
A: It’s often recommended to inspect all related gears since wear usually affects multiple components.

Q: Any tips for installing this gear?
A: Proper alignment and correct torque settings are critical—take your time and follow service guidelines.

Q: How does saltwater use affect internal gears?
A: Water intrusion can cause corrosion, so keeping seals in good condition is key to protecting gears.

Q: Can a damaged gear cause major lower unit failure?
A: Yes, if left unchecked, it can lead to further damage throughout the gearcase.