Figure 14-8. Pedal Shift Starter

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Figure 14-6. Gear Reduction Starter

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 14-9. Solenoid Shift Lever

TM 9-8000

Figure 14-8. Pedal Shift Starter

(1) Definition of Solenoid. A solenoid is a coil

shift plunger presses against the end of a contact

plunger. This action pushes a contact disk on the

of wire wound in a spiral of one or more layers, which

contact plunger across the switch contacts to operate the

produces a magnetic field when current is passed

starter. An overrunning clutch is required with this

through it. The magnetic field thus produced flows in

system to prevent damage to the starter at the time the

concentric circles around the wire.

engine starts.

(2) Operation of Solenoid Shift. A remote

f. Bendix Starter Drive (Flg. 14-10). The Bendix

control switch is necessary to operate the solenoid. The

drive is a starting mechanism that seldom is used on

ignition switch is connected to the control circuit so that

modern vehicles. This automatic screw pinion shift

the starter will not operate until the ignition is on. The

mechanism is built in two distinct styles: the inboard type,

solenoid shift unit is mounted rigidly on the starter field

in which the pinion shifts toward the starter to engage the

frame. Inside the solenoid coil is a heavy plunger

flywheel, and the outboard type, in which the pinion shifts

connected to the shift lever. The two larger terminal

away from the starter. The same general construction is

posts on the shift unit are connected in series with the

used in both types. A sleeve having screw threads

starter. The smaller terminal that leads to the solenoid is

(usually a triple thread), with stops at each end to limit

connected to the remote control circuit. When the

the lengthwise travel of the pinion, is mounted on the

remote control circuit is closed to supply current to the

extended armature shaft. The pinion gear, which is

solenoid coil, the solenoid exerts a pull on the shift

unbalanced by a weight on one side, has corresponding

plunger, which shifts the pinion to engage with the

internal threads for mounting on this sleeve. The sleeve

flywheel teeth. After the pinion shift lever has moved the

is connected to the starter armature shaft through a

distance required for engaging the pinion gear, the

special drive spring attached to a collar pinned to the

pointed end of the

armature shaft.

TA233579

14-6