Illustration #73
The inertia of the heavy piston assembly prevents it from spinning immediately when the motor shaft turns, so it slides along the thread and into engagement; when the engine starts, the pinion is turned faster than its shaft, so it is thrown back out of engagement.
Appears in
How the starting system works
Inertia system An inertia type starter: this one is an 'inboard' type in which the Bendix gear t...