Rolls-Royce Silver Shadow - Brush gear and commutator-To service; Starter motor-Bench inspection; Starter motor-To bench test

Workshop Manual
Rolls- Royce Silver Shadow & Bentley T Series
Chapter M
5.
Slacken the lork-nut and remove the eccentric
pin
or, which the startt: drive engagenlent lever
pivots.
6.
Remove the drive-end bracket from the
armature and intermediate bracket assembly.
7.
Using an aluminium tube of a suitable diameter,
(see Fig. MII) remove the thrust washer from the
end of the armature shaft extension. Prise the jump
ring from its groove and slide the drive assembly
and intermediate bracket from the shaft.
8.
Prise off the jump ring retaining the operating
bush and engagement spring.
Starter motor-Bench inspection
After dismantling the starter motor examine each
component for damage and wear.
Starter motor-To bench test
Measuring the light running current.
Clamp the starter motor securely in a vice.
[Jsing a 12 Volt battery, check the light running
current and compare it with the values given in
Chapter
A - General Information.
II there is excessive sparking at the commutator,
check that the brushes are clean and free to move
in their boxes and that the spring pressure is
correct.
Measuring lock torque and lock current.
Carry out a torque test and compare the results
with the values given in Chapter
A - General
Information. If a constant voltage supply is used,
it is important to adjust this to 7.2 Volt at the
starter terminal when testing.
Brush gear and commutator-To service
1.
Remove the starter motor as described in
Starter motor
- To remove. Clean the unit ~rior to
removing the die-cast alloy cover and sealing ring.
2.
Remove the two nuts which secure the die-cast
cover and sealing ring to the starter motor; remove
the cover.
3.
Check that the brushes are of adequate length,
the brushes must be renewed if they are worn to
8 mm. (5/16 in.).
4.
Check the commutator for signs of 'pitting'
and 'burning'. If necessary, clean it with a cloth
moistened with petrol. If this proves to be
unsatisfactory, the armature must be removed from
the starter motor. Check that the bearing diameters
FIG. MI0 EXPLODED VIEW OF STARTER MOTOR
1 Drive end bracket 10 Commutator end 17 Setscrew
2 Jump ring
bracket
18 Washer
3 Thrust collar 11 Alloy end cover 19 Seal
4 Roller clutch (showing rubber seal) 20 Through bolts and
5 Intermediate bracket 12 Seal washers
6 Seal (rubber)
13 Lock-washer 21 Brush
7 Armature 14 Nut 22 Strap-copper
8 Yoke
15 Washer 23 Solenoid
9 Brush
16 Nut 24 Gasket
25 Spring--push off
26 Plunger
27 Operating lever
(fork)
28 Seal (rubber)
29 Seal
30 Washer
31 Washer
32 Nut