R & D Engine Mount w/6.85" Footprint - 5/8" Stud - 80-230lbs Capacity Per Mount (Yanmar**)

The R & D Engine Mount w/6.85" Footprint is a heavy-duty isolation system engineered for Yanmar 4JH series installations, delivering the vibration damping and structural integrity that serious boaters demand. Whether you're retrofitting an aging transom mount or building a custom engine bed, this front-mount solution absorbs the relentless shock loads that come from hours underway in rough water. Designed to handle 80–230 lbs capacity per mount, it's the foundation piece that separates a smooth, quiet cabin from a fatiguing day of engine rattle and hull stress.

The mount's 6.85-inch footprint and 5/8-inch stud configuration provide a rigid connection point while the elastomeric core absorbs fore-aft and vertical vibration frequencies that degrade comfort and accelerate component wear. R & D Marine engineered these mounts specifically for marine duty, where salt spray, constant motion, and thermal cycling demand materials and construction that outlast automotive equivalents. The 4-lb weight per unit reflects solid engineering without unnecessary bulk, allowing precise tuning of the engine bed response and making installation straightforward on custom or stock applications alike.

Boaters upgrading or repairing Yanmar-powered vessels—from fishing boats to liveaboards—benefit most from this mount's proven ability to reduce noise transmission to the cabin and deck structure. Installation requires careful measurement of your existing engine bed and stud spacing; the 5/8-inch stud diameter is standard for the Yanmar 4JH platform, making retrofit straightforward for most applications. Verify your engine's weight and choose the appropriate number of mounts based on load distribution; most installations use four mounts (one per corner), though transom-mounted or heavily modified boats may require consultation with R & D Marine or a marine surveyor for optimal setup.