Starting System - Ford LSG 875 Service Manual

5-01 STARTING SYSTEM
5-01
Part 5 - Starting System
SUBJECT PAGE
DESCRIPTION AND OPERATION ..............
5-01
TESTING
Road Service
...............................
5-02
Jump Starting ...............................
5-02
On Vehicle Testing ..........................
5-02
If Starter Cranks Slowly ......................
5-02
If Starter Does Not Crank But
Starter Relay Operates (Clicks) ..............
5-03
If Starter
Does
Not Crank and
Relay Chatters or Does Not Click ............
5-03
If Starter Spins (Humming Noise)
But Does Not Crank Engine ................. 5-03
Starter Load Test ............................
5-03
Bench Tests ................................
5-04
SUBJECT PAGE
TESTING (Cont' d.)
Starter No-Load Test ....................... 5-04
Armature Open Circuit Test ................. 5-04
Armature and Field Grounded
Circuit Test .............................
5-04
REMOVAL AND INSTALLATION ............... 5-05
DISASSEMBLY AND ASSEMBLY
Disassembly ................................ 5-05
Cleaning and Inspection ...................... 5-05
Assembly
...................................
5-08
Starter Drive Replacement .................... 5-08
Brush Replacement .......................... 5-09
Armature Replacement ....................... 5-09
DESCRIPTION AND OPERATION
The starting system includes the starter motor
with an integral positive-engagement drive, the
battery, a remote control starter switch (part of the
ignition switch), the neutral-start switch (used with
automatic transmissions), the starter relay, starter
interlock switch (used with manual transmission),
and heavy circuit ' wiring.
When the movable pole shoe is fully seated, it
opens the field coil grounding contacts and the
starter is then in normal operation. Normal field
current is used to maintain the movable pole shoe
in the fully seated position during the time that the
starter is cranking the engine.
Turning the ignition key to the Start position
actuates the starter relay through the starter con-
trol circuit. The starter relay then connects the
battery to the starter.
Vehicles equipped with an automatic transmis-
sion have a neutral-start switch in the starter con-
trol circuit. This prevents operation of the starter
on vehicles with an automatic transmission if the
selector lever is not in the N (NEUTRAL)
or P
(PARK) position.
When the starter is not in use, one of the field
coils is connected directly to ground through a set
of contacts. When the starter is first connected to
the battery, current flows through the grounded
field coil, actuating a movable pole shoe. The pole
shoe is attached to the starter drive plunger lever
and thus the drive is forced into engagement with
the flywheel ring gear.
STARTER
NEUTRAL START SWITCH
(AUTOMATIC TRANSMlSSlON ONLY)
OR
CLUTCH INTERLOCK SWITCH
(MANUAL TRANSMISSION ONLY)
J1083-1 N
WARNING: MARINE STARTERS ARE EXTER-
NAL IGNITION PROTECTED. WHEN REPAIR-
ING OR REPLACING THESE UNITS, USE
ONLY PARTS OR ASSEMBLIES DESIGNATED
FOR THIS PURPOSE. TO SUBSTITUTE AUTO-
MOTIVE PARTS OR ASSEMBLIES, WHICH AP-
PEAR SIMILAR AND WILL FUNCTION, VOIDS
THE EXTERNAL IGNITION PROTECTION AND
GREATLY INCREASES THE DANGER OF IGNI-
TING A COMBUSTIBLE MIXTURE, RESULT-
ING IN POSSIBLE PERSONAL INJURY.