Yamaha - Lower Unit Assembly - Gearcase & Power Transfer - 64E-45300-22-8D

Overview

When you’re running a 150 or bigger Yamaha, the lower unit takes a lot of abuse, especially if you’re on the water often. I’ve seen these start to get noisy or lose that smooth feel over time, and at that point, a full replacement is the way to go. This assembly brings everything back to tight, clean operation—no guessing, no patch jobs. Once it’s on, you’ll feel that solid engagement and smooth push through the water again.

Key Features

• Complete Gearcase Assembly – Includes internal gears and housing for a full lower unit replacement.
• Smooth Power Transfer – Delivers consistent engine output to the propeller for reliable performance.
• Corrosion-Resistant Build – Designed to withstand saltwater exposure and harsh marine conditions.
• Reliable Shifting Operation – Provides clean engagement with reduced noise and vibration.

Engine & Boat Compatibility

Fits Yamaha outboard engines in the 150 to 200 horsepower range. Commonly used on offshore boats, center consoles, and larger recreational vessels requiring dependable performance.

FAQ

Q: What are signs my lower unit needs to be replaced?
A: Grinding noise, slipping gears, water in gear oil, or hard shifting are all common warning signs.

Q: Can I keep using my motor if the lower unit is noisy?
A: It’s not recommended—damage can get worse quickly and lead to full failure.

Q: Do I need to check gear oil before using this unit?
A: Yes, always verify proper gear oil level before running.

Q: How does saltwater affect lower unit lifespan?
A: Salt can cause corrosion and seal wear over time, so regular flushing and inspection are important.

Q: Is this part still current or has it been updated?
A: This assembly has been superseded by part number 64E-45300-23-8D, which is the latest version.

• Supersessions
  64E-45300-20-8D, 64E-45300-21-8D, 64E-45300-23-8D, 64E-45300-24-8D, 64E-45300-24-8D