Components Of Starter; Testing Field Coils; Reassembly And Refitting The Generator; The Starter Motor - Fiat 500L Workshop Manual

1
7
6
12
Key to Fig 11:5 1 Drive end head
6 and 7 Pin and spring for lever 8
12 Pinion, complete
16 Commutator end head

Testing field coils:

When tested with an ohmmeter the reading should be
8+.1—.3 ohms. Failing an ohmmeter use a 12-volt
supply and connect it in series with an ammeter across
the field terminal and the yoke or body. The meter should
read approximately 2 amps. If there is no reading the
field coil winding has a break in it. If the reading is much
more than 2 amps or the ohmmeter records at much less
than 8 ohms it shows that field coil insulation has broken
down. Renewal of the field coils is a specialist operation
best left to a service station.
The armature:
Apart from reconditioning the commutator, there is
little which can be done to the armature itself. Never try
to straighten a bent shaft and do not machine the arma-
ture core. Armature windings are tested with equipment
normally not available to the car owner. The only check
for a suspected faulty armature which the owner can do
is to substitute an armature which is known to be
satisfactory.
Generator bearings:
1 Commutator end head bearings. Remove the ball-
bearing outer race stop bracket mounting screw and
nut, ease out the stop brackets and the ballbearings.
2 Fan end head bearing. Remove the ballbearing retainer
mounting screw nuts and ease out the retainers and
the seals. Using a suitably sized drift remove the ball-
bearing.
114
2
8
9
13 14
FIG 11:5
2 Head shield
8 Starting engagement lever
13 Starting engagement spring
3
11
10
15

Components of starter

3 Frame
9 Head shield
14 Drive unit sleeve and free wheel hub
Reassembly is the reverse procedure to dismantling
in both cases.

Reassembly and refitting the generator:

This is the reverse procedure to dismantling. The
following points should however be noted.
1 The commutator end head ballbearing outer race stop
bracket mounting screw nut must be tightened to a
torque wrench setting of .80 Ib ft.
2 The pulley and fan-to-generator armature shaft self-
locking nuts must be tightened to a torque wrench
setting of 14.5 Ib ft.
3 To assemble the commutator end bracket to the yoke,
partially withdraw the brushes and trap them in this
position by letting the springs bear on the sides of the
brushes. Fit the bracket to the armature shaft and when
it is about 1/2 inch from the yoke face, lift the springs
using a thin screwdriver or a piece of hooked wire and
this will let the brushes drop onto the commutator.
Check that the springs now bear correctly on the tops
of the brushes and push the bracket fully home.
4 Pack all ballbearings with Fiat Jota 3 grease or an
equivalent grade grease.

11:4 The starter motor

Operation:
When operating the starter hand lever through a
flexible coupling a lever is operated (see FIG 11:5)
which controls the pinion engagement with the flywheel.
As the lever completes its movement it closes the starter
4
11
10
16,
4 Switch 5 Commutator cover band
10 and 11 Head fixing tie rods and tubes
5
15 Armature