Starting the Mercedes-Benz 240 D 3.0 from 1974: The ignition key of the Stroke/8 is turned to the driving position. This initiates pre-glow via a relay, and that stage is limited to a maximum of two minutes by a safety circuit.

The hand crank: Mercedes-Benz Museum Inside No. 12/2020 - Daimler Global Media Site - Starting the Mercedes-Benz 240 D 3.0 from 1974: The ignition key of the Stroke/8 is turned to the driving position. This initiates pre-glow via a relay, and that stage is limited to a maximum of two minutes by a safety circuit.