Engine Coupler Assembly - Long Steel Hub

Quicksilver Engine Coupler Assembly - Long Steel Hub

The Quicksilver Engine Coupler Assembly (98-8M0108208) is the genuine OEM flywheel-mounted coupling component engineered specifically for Mercury MerCruiser 8.1-liter 496 MAG and 496 HO sterndrive engines paired with Bravo I, II, and III drive units. This precision-built assembly forms the critical link between your big-block V-8 engine and the sterndrive, transmitting torque efficiently while absorbing torsional shock and vibration that would otherwise stress the drivetrain.

The coupler is constructed around a long, splined steel hub that engages the crankshaft with an exact fit — no forcing or shimming required. The hub is bonded to a high-durometer rubber compound that cushions abrupt throttle inputs, protecting gears and drive components during hard acceleration and heavy-tow conditions. Each unit is dynamically balanced at the factory to keep the drivetrain smooth from idle through maximum RPM, eliminating the mid-range buzz that worn or improperly balanced couplers produce. A corrosion-resistant coating on the steel core provides protection against bilge moisture and salt-air exposure, extending service life beyond what aftermarket alternatives typically offer. The assembly also incorporates a grease fitting to facilitate proper lubrication during routine maintenance.

Choosing a genuine OEM Mercury coupler ensures that spline count, hub depth, rubber durometer, and overall dimensions meet the original factory specification — critical factors for a component subjected to constant torsional loading. If you notice a burnt-rubber smell during hard launches, increased vibration at cruise, or visible cracking on the rubber bonding, this coupler is the correct direct replacement to restore performance and protect your investment.

Key Features

• Flywheel-mounted design for direct OEM fitment on MerCruiser 8.1L 496 MAG and 496 HO engines
• Compatible with Bravo I, Bravo II, and Bravo III sterndrive units
• Long steel hub with splined engagement — slides onto the crankshaft without modification
• High-durometer rubber bonding absorbs torsional shock and resists heat-induced tearing
• Factory dynamically balanced for smooth operation across the full RPM range
• Corrosion-resistant coating protects the steel core from moisture and salt air
• Grease fitting included for proper lubrication during maintenance
• Round profile, genuine OEM Mercury part