Starter, Permanent Magnet - Ford LSG 875 Service Manual

5a-01 Starter, Permanent Magnet
5a-01
Part 5a-Starter, Permanent Magnet
SUBJECT
PAGE
SUBJECT
PAGE
DESCRIPTION AND OPERATION
Jump Starting . . . . . . . . ..s................................................ 5a-02
Road Service . . . . . . . . . . . . . . . ..~..................................~....... 5a-02
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5a-01
DIAGNOSIS AND TESTING
Bench Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5a-06
System inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*....... 5a-03
DISASSEMBLY AND ASSEMBLY
Armature Replacement . . . . . . . . . . . . . . . . . . . . ..*.....a.............. 5a-11
DISASSEMBLY AND ASSEMBLY (Cont' d.)
Cleaning and inspection . . . . . . . . . . . . . . . . . . ..m..................... 5a-09
Starter Drive Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5a-11
REMOVALAND INSTALLATION
Starter Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*................ 5a-07
SPECIAL SERVICE TOOLS . . . . . . . . . . . . . ..*.......................... 5a-12
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5a-11
DESCRIPTION AND OPERATION
The function of the starting system is to crank the
engine at a speed fast enough to permit the engine to
start. Heavy cables, connectors, and switches are used
in the starting system because of the large current
required by the starter while it is cranking the engine.
The amount of resistance in the starting circuit must be
, kept to an absolute minimum to provide maximum
current for starter operation.
A
discharged or damaged
battery, loose or corroded connections, or partially
broken cables will result in slower than normal
cranking speeds, and may even prevent the starter
from cranking the engine.
Typical Starter Shown
The starting system includes the permanent magnet
gear-reduction starter motor with a solenoid-actuated
drive, the battery, a remote-control starter switch (part
of the ignition switch), the starter relay, the heavy
circuit wiring, and may include starter lock out devices.
STARTER
MOTOR ASSY
llO0-i
Sequence
of
Operation
1.
The ignition switch is turned to the START
position.
2.
A remote starter relay is energized, which
provides voltage to the starter solenoid. The
starter solenoid is energized, creating a magnetic
field in the solenoid coil.
3. The iron plunger core is drawn into the solenoid
coil.
4.
A lever connected to the drive assembly engages
the drive pinion gear to the flywheel ring gear.
5.
When the iron plunger core is all the way into the
coil, its contact disc closes the circuit between
the battery and the motor
terminals.
6. The current flows to the motor, and the drive
pinion gear cranks the flywheel and the engine
crankshaft.
7. As current flows to the motor, the solenoid pull-in
coil is bypassed.
8. The hold-in coil keeps the drive pinion gear
engaged with the flywheel.