R & D Engine Mount w/4" Footprint - 3/4" Stud - 250-563lbs Capacity Per Mount

The R & D Engine Mount w/4" Footprint - 3/4" Stud - 250-563lbs Capacity Per Mount is purpose-built for serious boaters and marine operators who demand reliability in harsh saltwater and freshwater environments. After years on the water, any captain knows that engine vibration and misalignment can destroy a powerplant faster than neglect. These heavy-duty mounts isolate drivetrain vibration while maintaining the rigidity needed to handle forward and reverse thrust loads that would fail lesser equipment. Whether you're running a center console offshore, a commercial fishing vessel, or a high-performance ski boat, proper engine mounting is non-negotiable.

R & D Marine engineered these mounts with a dual-stiffness design that balances isolation and control—soft enough to absorb the shock of rough water and prop bite, yet stiff enough to prevent dangerous fore-and-aft movement under load. The 4-inch footprint provides stable, compact installation across a wide range of engine sizes and hull configurations, while the 3/4" stud diameter ensures secure fastening to both the engine block and transom structure. Each mount carries a 250–563 pound capacity rating per unit, giving you flexibility in multi-mount systems and confidence under full throttle acceleration and deceleration cycles. The engineered elastomer composition resists UV, saltwater corrosion, and fuel degradation—critical for engines exposed to marine conditions year-round.

Retrofit and new-build installers rely on R & D mounts across pleasure craft, commercial fleets, and restoration projects because they simplify alignment and reduce shaft stress on through-hull seals and bearings. Verify your engine weight and transom configuration before ordering—most applications require multiple mounts staged in a triangle or square pattern. Installation requires basic hand tools and a level; improper mounting voids the vibration isolation benefit and accelerates wear on the drivetrain. Stock this SKU as a replacement or upgrade when you notice excessive vibration, oil weeping at the transom, or misalignment issues during haul-out inspection.