Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 334 / 413

2nd
re-Issue
Page 16
wiring giving rise to a high resistance in the
motor circuit. Check as described above.
-4. If the motor Is heard to operate, but does not
crank the engine, Indication Is given of damage
to the drive.
Bench Testing and Examination of Brushgear
and Commutator
1. If It Is necessary to remove the motor from
the engine first proceed as follows:-
Dlsconnect the cable from the positive battery
terminal to avoid any danger of causing short
circuits.
Disconnect the heavy cable from the starter
motor.
2. After removing the starter motor from the
engine, secure the body in a vice and test by
connecting it with heavy gauge cables to a 12
volt battery. One cable must be connected to
the starter terminal and the other held against
the body or end bracket. Under these light
load conditions, the starter should run a very
high speed-approximately 10,000 r.p.m.
3. If the operation of the motor Is unsatisfactory,
remove the cover band and examine the brushes
and commutator. Hold back each of the brush
6 7 8
I. TERMINAL NUTS AND WASHERS
2. THROUGH BOLT
3. COVER BAND
4. TERMINAL POST
WSM.124
Section N (Elec. Equip.)
springs and move the brush by pulling gently on
its flexible connector. If the movement is
sluggish, remove the brush from its holder and
ease the sides by lightly polishing on a smooth
file. Always replace brushes In their original
positions. If the brushes are badly worn so
that they will not bear on the commutator or If
the brush flexible connector is exposed on the
running face they must be replaced.
Check the tension of the brush springs with a
spring scale. The correct tension Is 15 to 25 ozs.
(·-42/·71 kg.). A new spring should be fitted if
the tension Is low.
If the commutator is blackened or dirty, clean
it by holding a petrol-moistened cloth against
It while the armature Is rotated.
-4. Re-test the starter as described under (2). If the
operation Is still unsatisfactory, the unit must
be dismantled for detailed Inspection and
testing.
To Dismantle (See Fig. 13)
1. Remove the cover band, hold back the brush
springs and lift the brushes from their holders.
2. Remove the terminal nuts from the terminal
post.
5
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5749
S. BEA.RING BUSH (DRIVE END)
6. BEARING BUSH (COMMUTATOR END
7. BRUSH SPRINGS
8. BRUSHES
Fis. 13.
Exploded
view
of
starter motor