Engine Coupler for MerCruiser 3.0L, 4.5L MPI & GM V6/V8 – Alpha Sterndrive

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About this product

This replacement engine coupler connects the engine flywheel to the sterndrive input shaft, transferring engine power to the drive. It provides a replacement for a worn or damaged coupler on compatible MerCruiser petrol engines fitted with Alpha sterndrives. The assembly uses a triangular flywheel mounting arrangement and is supplied without a yoke. Applications include selected 3.0L, 4.5L MPI and GM-based V6 and V8 engines, subject to model and serial-number confirmation. Product details Part type: Engine coupler assembly Fitting position: Engine flywheel to sterndrive input shaft Mounting type: Triangular flywheel mount Drive application: Compatible MerCruiser Alpha sterndrives Engine applications: Selected 3.0L, 4.5L MPI and GM V6/V8 petrol engines V8 engine references: 305 cu. in. (5.0L) and 350 cu. in. (5.7L) Listed year ranges: 3.0L: 1999–2016; GM V6/V8: 1993–2015 Yoke: Not included Product status: Aftermarket replacement (non-OEM) Replaces manufacturer’s part number 18643A5 Check compatibility Confirm the replacement using your engine and sterndrive serial numbers and original coupler reference. Compare the flywheel mounting arrangement, coupler profile and input shaft conne

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