How can I keep an outboard motor from turning while trailering my boat?
My outboard swings to one side when I tow the boat, even if I straighten it before leaving. What should I use to hold it still, and will a transom saver stop it turning?
Answer
Stop the outboard swinging sideways with a steering restraint approved for your engine and steering system, usually hydraulic steering clips, a dedicated steering lock or the tiller model's steering friction adjustment. Support the engine at its recommended trailering angle separately, because a tilt support or transom saver may still let it turn.
Check your steering system
Identify whether you have tiller, mechanical cable, hydraulic or electric steering. The right restraint depends on which parts move when the engine turns. An unsuitable device can load the steering cable, damage a hydraulic cylinder or interfere with powered steering.
With the engine switched off and supported in its trailering position, gently check its sideways movement. Watch the steering linkage and mounting points instead of pulling harder on the cowling.
- Tiller steering: look for a steering friction lever, adjustment screw or separate steering lock around the swivel bracket.
- Cable steering: check the drag link, cable attachment and tilt-tube mounting for looseness.
- Hydraulic steering: identify the cylinder make and model, and check for leaks or excessive movement.
- Electric or integrated power steering: follow the engine manufacturer's transport instructions. External hydraulic clips may not fit or be permitted.
Repair a loose drag-link nut, worn bush or leaking cylinder before towing. These parts have no universal tightening torque. Use the specification for your exact steering kit and engine.
Choose a steering restraint
On many conventional hydraulic installations, removable steering clips fit over the exposed cylinder rod on either side of the cylinder body. With the engine centred, correctly sized clips fill the available travel and stop the cylinder moving sideways. Kits for SeaStar/BayStar-type installations are common, but they must match the particular cylinder.
Measure the exposed rod lengths with the engine straight, then check the kit's specified diameter and length. Hydraulic cylinders do not all take the same clips. Never force an oversized clip between components. Keep the rod clean, as grit trapped against its polished surface can damage the seals later.
For cable steering, use a purpose-made restraint approved for that arrangement. Do not clamp the steering cable or wedge anything into the linkage. A steering-wheel strap may reduce wheel movement, but free play can still let the engine rock. It is a poor substitute for a suitable engine restraint.
On a small tiller outboard, increase steering friction only as the handbook allows. Friction adjustment does not always provide a positive transport lock. If the engine still swings, fit its specified locking device or an approved restraint. Do not overtighten the adjustment.