Workshop Manual
Rolls- Royce Silver
Shadow
8
Bentley
T
Series
Chapter
M
If
thy
test lamp illuminates. this indicates that
the motor is not switched
off
and that current
is
flowing and the wiper motor is in a stalled position.
Should this occasion arise,
thr setting instructions
previously described
shot~ld he repeated. The correc
settings provide an adequate margin for the parking
switch to operate under
st,rvice conditions.
FIG. M71 WIPER MOTOR PARKING
SWITCH
SElllNG
1
Parking switch gauge
2
Wiper motor cross head
3
Parking switch adjuster
FIG.
M72
WIPER
BLADE
PARKING GAUGE
1
Wiper arm latch pin
2
Parking gauge
3
blindscreen sealing rubber
Maintenance-Wiper blades
I-xcc~ssivt~ friction between apparently satisfactory
wiprr hlatles and the
windshield
rriay result in a
marked reduction in wiping speed when the wiper
blades
arr opt,rating on a windshield that
is
only
partially wet.
A
further symptom is that the bladrs
become noisy at cach end of the wiving arc.
-
.-
If
the wiper blades are suspect. they should be
changed with a pair known to be in good condition;
if this
rectifirs the fault, new wiper blades should
he fitted.
'Lucas'
6
W wiper motor-To measure
light-running current
1.
Unscrew and remove the six self-tapping
screws which secure the gearbox cover, then lift
off the cover to expose the connecting rod and
gearbox
(sce
Fig.
M73).
2.
Remove the circlip securing the eccentric
coupling to the final gear
crankpin
(for further
information see Anti-streak mechantsm).
3.
Remove the connecting rod from the gearbox
to release the cross-head and rack.
4.
Connect a first grade moving-coil ammeter in
series with the wiper motor
supvly cable and
--
.
measure the light-running current. The light-running
current at normal speed should read between
2.7
amp
to
3.4
amp, and at high speed between
2.0
amp to
2.6
amp. with 12 volt supply measured at the motor.
Should the motor not conform to these figures
the motor should be renewed.
'Lucas'
6
W
wiper motor-To dismantle
(see Fig.
M73)
1.
Unscrew and remove the
six
self-tapping
screws securing the gearbox cover and remove the
cover.
2.
Remove the circlip securing the- eccentric
coupling to
the final gear crankpin
(for further
information see Anti-streak mechanism).
3.
Remove the connecting rod eccentric coupling
and final gear.
4.
Prise off the final gear shaft circlip and
washer. Clean the circlip groove before removing
the gear shaft from its bearing.
5.
Remove the armature end-play stop plate.
6.
Remove the intermediate gear circlip and
washers. Clean out the circlip groove
belore
removing the gear.
7.
Examine all gear teeth for damage and if
necessary renew the damaged gears.
8.
Unscrew and remove the two through-bolts,
insulating tubes and the commutator end bracket
from the yoke.
9.
Remove tht= fibre comb-shaved brush arm
retainer plate from below the terminal assembly.
To Next Page
Loading...
