Yamaha - Lower Casing Packing - Lower Unit Sealing Component - 68T-45315-A0-00

Overview

This is one of those sealing parts that quietly does its job until it doesn’t—and when it fails, you’ll know fast. The packing sits in the lower casing and helps keep water out and gear oil where it belongs. I’ve seen perfectly good lower units get damaged just from a worn seal like this being overlooked. It’s a simple replacement that goes a long way in protecting everything inside.

Key Features

• Reliable Sealing Function – Helps prevent water intrusion and keeps gear oil contained within the lower unit.
• Durable Material Construction – Built to withstand constant pressure, heat, and exposure to marine conditions.
• Precision Fit Design – Matches Yamaha specifications for proper seating and sealing performance.
• Supports Gearcase Longevity – Helps protect internal components by maintaining a sealed environment.

Engine & Boat Compatibility

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

FAQ

Q: What are the signs this packing is failing?
A: Milky gear oil, water intrusion, or oil leaks around the lower unit are common signs.

Q: Can I reuse this packing after removing it?
A: It’s not recommended. Once removed, it usually won’t seal properly again.

Q: How often should this be replaced?
A: Typically during major lower unit service or anytime seals are being inspected or replaced.

Q: Does saltwater affect this component?
A: Over time, yes. Salt exposure can harden or degrade the material if maintenance is skipped.

Q: Is installation difficult?
A: It’s straightforward, but proper seating is important to ensure a tight seal.