Mercury – Quicksilver Shift Cable Bellows Kit | Driveline Seal | Flexible Composite | 74639Q02

Overview

Water intrusion is one of the leading causes of damage to sterndrives, and the Mercury Marine 74639Q02 Quicksilver Shift Cable Bellows Kit is designed to stop it before it starts. This OEM replacement bellows fits MerCruiser drives with shift cables, forming a tight, flexible seal that protects the driveline from corrosion and water damage. Made from tough, convoluted rubber that flexes with your drive’s motion, it comes complete with two stainless-steel hose clamps for a quick, secure installation using standard tools.

Key Features

• Purpose: Seals the shift cable entry to prevent water from entering the sterndrive.
• Material: Constructed from durable, flexible composite rubber for long service life.
• Design: Convoluted and tapered shape allows smooth movement and tight sealing.
• Performance: Protects against corrosion, leaks, and driveline wear.
• Durability: Resistant to UV exposure, fuel, oil, and marine heat.
• Ease of Installation: Includes two stainless-steel hose clamps and installs easily with common tools.

Engine & Boat Compatibility

• Fits MerCruiser sterndrives equipped with shift cables
• Suitable for various Alpha and Bravo drive configurations

Performance & Real-World Benefits

The 74639Q02 shift cable bellows keeps your MerCruiser’s inner components safe from water and debris. Its flexible design allows it to move naturally with the drive’s trim and steering adjustments while maintaining a watertight seal.

A cracked or brittle bellows can let water seep in, leading to rusted cables or internal damage. Replacing it as part of regular maintenance is a simple way to prevent expensive repairs and keep your driveline working smoothly.

Why Choose Mercury OEM

The Quicksilver 74639Q02 is a genuine Mercury Marine part, engineered specifically for MerCruiser sterndrives. Aftermarket bellows often use thinner or less flexible rubber that can fail under heat or vibration.

Mercury’s OEM bellows are made from high-grade materials tested for long-term flexibility, sealing power, and durability. Choosing OEM ensures a precise fit and years of reliable protection for your drive system.

FAQ

Q1: What does this kit include?
It includes one shift cable bellows and two stainless-steel hose clamps for a complete installation.

Q2: What drives does it fit?
It fits MerCruiser sterndrives that use a shift cable — check your service manual for exact model compatibility.

Q3: What’s the bellows made of?
It’s made from marine-grade, flexible composite rubber designed to resist cracking and UV damage.

Q4: How often should it be replaced?
Inspect every season and replace if you see cracks, brittleness, or water intrusion — typically every 3–5 years.

Q5: Why OEM instead of aftermarket?
Mercury OEM bellows offer better flexibility, tighter sealing, and longer lifespan than generic replacements.