An outboard that won’t go into gear usually has a shift cable problem: the cable is out of adjustment, stretched, binding or broken, or it has come off its linkage at the engine or control box. Other causes are a high idle speed that makes shifting hard, a fault in the remote control box, and, less often, damage inside the lower unit such as a worn clutch dog or a broken shift shaft. If the motor shifts but the prop does not push the boat, a sheared pin or spun prop hub is the likely cause.
Common causes
| Cause | Clues |
|---|---|
| Shift cable out of adjustment | Goes into one gear but not the other; neutral is off-center |
| Stretched, binding or broken cable | Stiff or loose control, no change at the engine |
| High idle speed | Hard, clunky shifting; see outboard idle problems |
| Remote control box | Lever moves but the cable does not, or the lever binds |
| Lower unit damage | Grinding, clunking, milky or metal-filled gear oil; see milky lower unit oil |
| Sheared pin or spun hub | Engine in gear, prop turns weakly or not at all; see boat propellers |
Boat won’t go into gear when running
If it shifts with the engine off but not when running, the idle may be too high or the shift mechanism needs a quick, firm movement. Many outboards are designed to be shifted at idle with a decisive motion. If the idle is set correctly and it still will not engage, check the cable adjustment and the lower unit.
Outboard shift cable adjustment
- Put the remote control in neutral.
- At the engine, disconnect the shift cable end and move the engine’s shift linkage to its neutral detent.
- Adjust the cable barrel until it fits onto the linkage without moving it from neutral.
- Reconnect it and check that forward and reverse both engage fully and that neutral is centered.
Procedures vary by brand and model, so follow the service manual.
Checking the lower unit
Drain a small amount of gear oil and check for water or metal. Large metal pieces or a rough, grinding shift suggest worn clutch dogs or gears; see how to change lower unit oil.
Prevention
Lubricate cable ends and linkages, shift firmly at idle rather than slowly, and service the lower unit each season; see outboard motor maintenance. For other problems see outboard won’t start and outboard loses power at full throttle.
More guides: tiller vs remote outboards.
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