Mercury – Bell Housing Gasket Kit | Marine Seal Set | MerCruiser MC-I Drives | 64818T4

Overview

A tight seal means fewer problems on the water. The Mercury Marine 64818T4 Bell Housing Gasket Kit gives you all the right pieces to reseal and protect your MerCruiser MC-I drive. Designed for drives with serial numbers 6225576 and below (1967–1982), this kit includes five factory-spec gaskets made from durable, marine-grade material that won’t dry out or shrink. Replacing these gaskets during service prevents leaks, helps fight corrosion, and keeps your classic MerCruiser performing the way it should.

Key Features

• Purpose: Seals the bell housing for proper fit and protection from leaks.
• Contents: Five precision-cut gaskets for a complete installation.
• Material: Built from marine-rated composite that stands up to oil, heat, and moisture.
• Performance: Creates an even, reliable seal to stop corrosion and maintain alignment.
• Durability: Holds shape under vibration and pressure for long-term reliability.
• Ease of Service: Designed for a simple, direct replacement with basic tools.

Engine & Boat Compatibility

• MerCruiser MC-I drives (serial No. 6225576 and below, 1967–1982)

Performance & Real-World Benefits

The 64818T4 gasket kit is a straightforward way to bring back proper sealing to an older MerCruiser. Over time, gaskets compress, allowing water to creep in and cause corrosion between components. Swapping them out with this complete set restores a clean, tight seal and helps protect the drive’s internals from water intrusion and damage.

These gaskets are cut to match the original factory design, so they fit perfectly and seal evenly. It’s a simple upgrade that helps your vintage MerCruiser stay leak-free and dependable for seasons to come.

Why Choose Mercury OEM

The Mercury 64818T4 is a genuine factory kit, made specifically for early MC-I drives. Generic replacements can be off by fractions of a millimeter or made with softer materials that degrade quickly under marine conditions.

Mercury OEM gaskets are tested for compression strength, sealing accuracy, and longevity. Using factory parts means no guesswork — just the right fit, reliable sealing, and lasting protection from the people who built your drive in the first place.

FAQ

Q1: Which drives use this kit?
It fits MerCruiser MC-I drives with serial numbers 6225576 and below (1967–1982).

Q2: What comes in the package?
A 5-piece gasket set for sealing the bell housing.

Q3: Why replace all gaskets at once?
Old gaskets lose compression over time. Replacing the full set ensures a tight, even seal.

Q4: What materials are used?
Each gasket is made from a marine-grade composite built to handle heat, oil, and water.

Q5: Why OEM instead of aftermarket?
OEM gaskets fit perfectly, last longer, and give better protection against corrosion and leaks.