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      • Sierra 18-2171 Engine Coupler Replaces 76850A2
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        Sierra 18-2171 MerCruiser GM Engine Coupler

        $330.99
        $253.38

        Sierra 18-2171 MerCruiser Engine Coupler Sierra replacement round style engine coupler for all GM marine engines Except MerCruiser MR/Alpha/Bravo with Triangular, 3-bolt coupler. All Sierra aftermarket parts are manufactured to meet or exceed OEM...

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      • Mercruiser 18643A-5 Engine Coupler Assembly
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        Mercruiser 18643A-5 Engine Coupler Assembly

        $467.99
        $407.49

        Mercruiser 18643A-5 Engine Coupler Assembly Genuine OEM Mercury - Mercruiser part. Replacement engine coupling assembly for Mercruiser stern drives. Fits: MCM 3.0L (1999‑2016), 4.5L MPI, GM V‑6 & V‑8 (305 & 350 CID)...

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      Mercruiser OEM Engine Parts Finder

      Mercruiser Engine Couplers

      Mercruiser Engine Couplers link the engine to the sterndrive. Since it connects the boat’s power source to the propulsion system, you want to make sure your couplers are functioning properly. That is why we carry Mercruiser coupler replacements and Mercruiser coupler kits. We supply Sierra products, all meeting OEM requirements.