This article presents a few sketches and photographs of the modification of a 20-Revenge from a standard outboard transom to one with engine setback brackets. The current steering gear is something of a kludge. It is planned to be replaced with a new hydraulic actuator that installs in the tilt tube of the engine.
This view from the cockpit shows the two engines mounted on newly installed Springfield Marine 10-inch setback brackets with height adjustment. The brackets are mounted in the original holes in the transom from the engine installation. Larger diameter bolts were used ( now 1/2-inch stainless steel). The engines are at different tilt angles which makes things look asymetrical. The background clutter in the storage shed had been painted out for clarity.
Profile view shows anticipated problems when the starboard engine tilts up ; the hydraulic steering gear will interfere with the tilt range by hitting the bracket. Note that the engines have been mounted one-hole up on the brackets as suggested by LHG to create a relief for cables to run across under the engine mounts. The engine brackets are set to the lowest position. The engine height relative to the original transom appears to be slightly raised at this setting. It may work out that the engines will need to be moved down to the "top" hole mounting to permit them to be lowered into the water a bit more. Sea trials will determine this.
Overview of the starboard engine showing awkward rigging of the hydraulic steering gear. Note there is plenty of hydraulic hose available to move to a new tilt-tube style cylinder mounted to the port engine and with its steering arm projecting to port. This will not require changing the direction of the tilt tube pivot in the engine mount.
Closeup of starboard engine showing details of the hydraulic steering gear.
Closeup of port engine showing details of the steering tang. The oddly shaped stainless steel plate looks homemade.
This sketch shows how the steering is installed on the starboard engine as seen from overhead and behind. The helm unit is marked "SEA STAR I". Note how the attachment to the tilt tube arm is hinged. This allows the arm from the hyraulic ram to pivot slightly as the ram moves back and forth.
This sketch shows some of the details and the nomenclature of the gear. The hydraulic unit is marked
SEA STAR OUTBOARD HYDRAULIC STEERING made by Teleflex Canada LTD Vancouver, Canada A1186 (engraved on pillow block)
This sketch shows the tie bar. There are hinges at each end to permit articulation of the bar as the engines are tilted independently.
This sketch shows the fittings on the starboard engine that are attached to the steering tang from the engine mount. An L-shaped Stainless Steel tang extension is bolted to the engine with two machine screws. A flat stainless steel plate which looks somewhat homemade lies on the tang extension and fastens to it via two thru bolts and aligning holes. The tie bar also connects to this plate. The steering cylinder has an elaborate arm which connects to the plate.
This sketch shows the fittings on the port engine that are attached to the steering tang from the engine mount. An L-shaped Stainless Steel tang extension is bolted to the engine with two machine screws. A flat stainless steel plate which looks somewhat homemade lies on the tang extension and fastens to it via two thru bolts and aligning holes. The tie bar also connects to this plate via a hinged pivot.
What cylinder to order from TELEFLEX? It must be compatible with the SEA STAR I helm unit.
I spoke with Al Campbell at TELEFLEX and he said the SEA STAR I helm will be compatible with the HC#5370 SIDE MOUNT CYLINDER
The cylinder will be mounted in the tilt tube of the port engine with the actuator arm extending to port. An OEM Yamaha (or equivalent) drag link must be obtained to connect the steering cylinder actuator arm to the outboard motor tiller arm. Source for this TBA!
Anyone have the part number and price for the proper YAMAHA drag link arm? And a good source for this?
Are the current outboard tiller arms the original YAMAHA parts? (These are partially shown in the photographs above and are connected to those SS plates that then connect to the tie bar and steering cylinder)
A tie bar must be rigged between the engines to connect them. It may also be possible to use the existing tie bar and the existing steering tang extensions if re-worked in some way. The odd shaped plates on each engine may be discarded or they may be re-worked to use again. Perhaps new holes could be drilled in them to allow the exiting tie bar to be re-used.
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Author: James W. Hebert
This article first appeared March 6, 2002.