Alternate action To make the new style air motors perform the same as the old style motors, the distance from the end of the pinion gear to the engine ring gear must be increased. Adding a shim between the air motor mounting face and the engine starter mounting bracket will accomplish this. A single air starting motor, Fig. An installation can also be equipped with single or dual electric motors. The basic engine starting system utilizes air motors with pinion drive to flywheel ring gear.
Operational control is the same for either single or dual air starting motor starting system.
The pushbutton is a single contact switch which remains closed during the engine cranking period. Refer to Fig. 4-3 and the following paragraphs for operation of a basic dual air starting motor starting system. The entry of air moves the pinion gear forward to engage with the engine ring gear. Movement of the pinion gear uncovers a port allowing air pressure to be released to the upper starting motor which, in turn, engages its pinion gear with the engine ring gear.