Grounded Armature Test; Starter Solenoid Test; Starter Motor Removal And Installation - Ford LSG 875 Service Manual

5a-07
Starter, Permanent Magnet
5a-07
DIAGNOSIS AND TESTING (Continued)
2. Disconnect starter from battery. Then, reduce
resistance of rheostat until voltmeter indicates
same reading as that obtained while starter was
running. The ammeter will indicate starter no-load
current draw. Refer to Specifications for a
comparative value.
3. If current exceeds specification, check for
rubbing armature, bent shaft, binding bearings, or
shorts in armature, or brush assembly.
Armature Open Circuit Test
An open circuit armature may sometimes be detected
by examining the commutator for evidence of burning.
A burn spot on the commutator is caused by an arc
formed every time the commutator segment,
connected to the open circuit winding, passes under a
brush.
Grounded Armature Test
This test will determine if the winding insulation has
been damaged, permitting a conductor to touch the
frame or armature core. To determine if the armature
windings are grounded, check with a VOM as shown.
Infinite resistance indicates a normal condition.
Starter Solenoid Test
Make sure that the solenoid is isolated electrically
from the motor. Using a VOM, check for continuity
between S terminal and M terminal, and between S
terminal and ground (frame). If there is no continuity,
the wire is broken and the solenoid should be
replaced.
REMOVAL AND INSTALLATION
Starter Motor
Removal
WARNING: WHEN SERVICING STARTER OR
PERFORMING ANY MAINTENANCE IN THE AREA
OF THE STARTER, NOTE THE HEAVY GAUGE
INPUT LEAD CONNECTED TO THE STARTER
SOLENOID
IS HOT AT ALL TIMES. MAKE SURE
THE PROTECTIVE CAP IS INSTALLED OVER THE
TERMINAL AND IS REPLACED AFTER SERVICE.
1.
Disconnect the negative battery ground cable.
2. Disconnect starter cable and push-on connector
from starter solenoid.
CAUTION: When disconnecting hardshell
connector at S-terminal, grasp the plastic
shell and pull off. Do not pull on wire. Be
careful to pull straight off to prevent damage
to the connector and S-terminal. If any part
of the connection is damaged, replace the
damaged components.
3. Remove upper bolt with a 3/8 inch drive ratchet,
swivel socket and a 22 inch long extension.
Access is in front of and along side of the
right-hand front engine mount.
4. Remove lower bolt.
Installation
1.
Position starter motor to engine and install upper
and lower bolt finger-tight.
2. Tighten the upper bolt to 2 1-27 Nom (15-20 ft-lb).
Access to upper bolt is with a 3 / 8 inch drive
ratchet, swivel socket and a 22 inch long
extension. Access is in front of and along side of
the right-hand front engine mount.
3. Tighten the lower bolt to 2 l-27 Nom (15-20 ft-lb).
4.
Connect starter solenoid connector. Be careful to
push straight on and make sure connector locks
in position with a notable click or detent.
5. Install starter cable nut to starter terminal.
Tighten to 9- 13 Nom (80- 120 in-lb).
6. Replace red solenoid safety cap.
7. Connect negative battery ground cable.
Wiring
It is recommended that wiring service kit
F2PZ-1 lK162-A be used, which includes a 70 inch
long # 12 gauge wire, a terminal nut, a terminal cover,
four tie wraps and insulation instructions.