18643A5 Premium Engine Drive Coupler Assembly for MerCruiser Alpha One, Gen II & Bravo Sterndrives | Fits 3.0L 4.3L 4.5L 5.0L 5.7L Engines | 14-Inch Flywheel, 3-Inch Bolt Pattern | Replaces 18-2323

FASWORX Premium Engine Drive Coupler Assembly (18643A5) Keep your powertrain running at peak performance with the FASWORX Premium Engine Drive Coupler. Manufactured to exacting technical standards, this heavy-duty coupler is built to last, providing exceptional rotational strength and vibration dampening for your MerCruiser Alpha or Bravo sterndrive. Whether you are doing routine maintenance or a complete overhaul, this premium aftermarket upgrade ensures a reliable connection between your engine and drive. Technical Specifications: Flywheel Size: 14-Inch Bolt Pattern: 3-Inch Crankshaft Bolt Pattern Mount Type: Triangular Shape Seal Compatibility: 1-Piece Rear Main Seal Note: Does not include input yoke or mounting hardware.

• DIRECT REPLACEMENT: Exact fit aftermarket replacement for OEM part numbers 18643A5, 18643A7, and 710-18643A5. Also seamlessly cross-references with Sierra 18-2323, GLM 11532, and EMP 93-93203.
• MARINE-GRADE DURABILITY: This premium part is built to last through high-torque applications and harsh marine environments, offering superior vibration dampening and rotational strength to outlast standard alternatives.
• PRECISE TECHNICAL SPECS: Designed specifically for 14-inch flywheels with a 3-inch crankshaft bolt pattern. Features a triangular shape, flywheel mount design for engines utilizing a 1-piece rear main seal.
• DRIVE COMPATIBILITY: Engineered to securely fit MerCruiser Alpha One, Alpha Gen II, and Bravo (LX) sterndrives connected to 3.0L (4-Cyl), 4.3L (V-6), 4.5L MPI, 5.0L, and 5.7L (V-8) engine blocks.
• FITMENT VERIFICATION: Input yoke is NOT included. To ensure a correct installation, you must verify your exact engine block size and serial number against our fitment chart before purchasing.