Checks And Inspections - Alfa Romeo alfa 33 Workshop Manual

5. Remove the rotor electromagnet
assemblage and take the rotor to
pieces as for the Bosch starter
motor (see: Bosch Starter Motor,
steps IZ., 13. and 14.).
3
Electromagnet F o r k
1
2
4 Clutch
R o t o r
6. If necessary, take the
winding out of the yoke (see: Bosch
s t a r t e r m o t o r . s t e p 1 5 ) a n d t h e
bushes out of the commutator casing
and out of the drive housing.
CHECKS
AND INSPECTIONS
Before making any electrical inspec-
tion thoroughly blow-clean the com-
ponents and especially the ends
of the winding with compressed air
and clean the commutator with a
cloth slightly wetted with petrol.
Commutator wear
Put the rotor on a lathe.
1.
2. Place a magnetic-based centesi-
with the gauge feeler in contact with
the commutator 0.
3. Bosch and Marelli Starter Motors
Eccentricity should not be more than
the stated maximum.
Max permissible commutator
eccentricity
b.06 mm (0.0024 in)
IGNITION, STARTING, CHARGING SYSTEM
1 Commutator
4. If greater errors than these are
pound or if the commutator is badly
scored, put in a new rotor unless it
would seem enough to turn the rotor
and smooth it with a piece of cloth
for rotors.
Bosch and Marelli Starter Motors
M a x t u r n i n g d e p t h o n n o m i n a l
field
thickness
0.25 mm (0.0098 in)
Commutator
1. Set the tester to the fi x 100
scale.
2. Put the prods on the commu-
tator segments of the pack under
test:
3. The test should show current
flow.
If there is no electrical continuity,
put in a new rotor.
CAUTION:
Repeat steps 2. and 3. for all the
pairs of commutator segments.
O S - I O
Rotor insulation test
1.
2. Put one prod on the commu-
tator and the other on the segment
pack or shaft.
3.
current flow by the tester.
4.
circuit) put in another rotor.
CAUTION:
continuity test
Repeat steps 2. and 3. for all the
commutator segments.
Rotor shortcircuit test on test
stand
1.
pole pieces of the rotor testing
apparatus and switch on.
2.
the steel blade on the rotor pack.
3.
in correspondence with the faulty
lead cables if there is a short circuit.
Excitation winding insulation
test
1.
2.
induction windings and the other
prod on the yoke.
Set the tester to c? x 1 scale.
There should be no sign
If the insulation is broken (short
Position the rotor between the
Slowly rotate the rotor and rest
The blade will stick to the pack
Set the tester to the ax 1 scale.
Put one prod on the lug of the
of