starting handle
a crank handle fitted to or supplied with older vehicles for the purpose of starting the engine, even if fitted with a starter motor.
starting handle: the hand-crank backup for engine ignition
A starting handle is a removable or hinged crank, typically 12 to 18 inches long, that engages with the crankshaft of an internal combustion engine to rotate it manually for cold starting. Though primarily a feature of early automobiles and small engines predating reliable electric starters, these handles remained fitted to many vehicles well into the mid-twentieth century as a mechanical backup when the battery was dead or the starter motor failed.
The handle connects to the engine via a squared or splined shaft that meshes with a corresponding socket on the crankshaft. Turning the handle rotates the crankshaft, drawing air and fuel into the cylinders, compressing the mixture, and (if ignition timing is correct) firing it to start combustion. Early designs required considerable physical effort, sometimes 40 to 60 complete revolutions, and carried a real danger: if the engine fired while being cranked, the handle could snap backward violently, breaking the operator's wrist or thumb. Later versions incorporated a one-way clutch to disengage the handle once the engine turned fast enough.
Variants and practical use
Starting handles came in two basic forms: permanent fixtures mounted through the front bumper or grille, and detachable cranks stored in the tool kit. Motorcycles and small stationary engines often had hinged handles bolted to the flywheel housing. Some agricultural and industrial engines used hand wheels with extended spokes rather than true cranks. Tractors and older diesel engines frequently retained starting handles into the 1960s and beyond because of the sheer starting effort required in cold weather or high compression ratios.
The term is now nearly obsolete in automotive work, rendered irrelevant by modern electric starters, sealed batteries, and glow plugs for diesel engines. However, mechanics and enthusiasts restoring vintage vehicles still encounter them, and the principles remain relevant for hand-starting small engines like portable pumps, generators, and motorcycles where electric starters are absent or unreliable. The handle itself, if original, is a collectible and a genuine safety hazard if misused.