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6D-40
1977 PONTIAC SERVICE MANUAL
CRANKING
General Description
.............................................
6D-40
Cranking Circuit
......................................................
6D-40
Starter Motor
...........................................................
6D-40
Diagnosis
......................................................................
6D-40
On-Car Service
............................................................
6D-42
Remove and Replace
............................................
6D-42
Starter
...................................................................
6D-42
Solenoid
...............................................................
6D-43
Overhaul
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6D-43
Disassembly
............................................................
6D-43
Component Inspection
............................................
6D-43
Reassembly
..............................................................
6D-44
GENERAL DESCRIPTION
CRANKING CIRCUIT
The cranking circuit consists of the battery, starting
motor, ignition switch, and related electrical wiring. These
components are connected electrically as shown in Figure
6D-46. Only the starting motor will be covered in this
portion. Refer to Section 6D for information on the other
components.
SYSTEM
STARTING MOTOR
Enclosed shift lever cranking motors have the shift lever
mechanism and the solenoid plunger enclosed in the drive
housing protecting them from exposure to dirt, icing
conditions and splash. A typical motor is shown in Figure
6D-47.
In the basic circuit shown in Figure 6D-46, the solenoid
windings are energized when the switch is closed. The
resulting plunger and shift lever movement causes the pinion
to engage the engine flywheel ring gear and the solenoid main
contacts to close, and cranking takes place. When the engine
starts, pinion overrun protects the armature from excessive
speed until the switch is opened, at which time the return
spring causes the pinion to disengage. To prevent excessive
overrun, the switch should be opened immediately when the
engine starts.
DIAGNOSIS
Before removing any unit in a cranking circuit for repair,
the following checks should be made:
Battery: To determine the condition of the battery,
follow the testing procedure outlined in the Battery Section
of 6D. Insure t h a t the battery is fully charged.
.
TO DISTRIBUTOR
-BATw TERMINAL
n
PULL IN COIL
HOLD IN COIL
SHIFT LEVER
STARTER SWlT CH
SPRING
CRANKING MOTOR
2419
Fig. 60-46 Cranking Circuit
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All
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