THE
ELECTRICAL
SYSTEM
34.
b. Close
the switch
(this
throws the drive assembly
into
the engaged
position)
and
measure
the
distance between
the
pinion
and the thrust collar
on
the
armature
shaft
extension.
When making
the
measurement,
take
up
the slack
in
the
engagement
linkage by
lightly
pressing
the
pinion
towards the
armature.
The
measurement
should
be
.005
to
.015
in.
(.13
to
.4
mm.).
To
adjust
this
setting,
slacken
the locknut
on
the
engagement
lever
pivot pin
and
rotate
the
pin
until the
measurement
is
correct.
The
are
of
adjustment is
180 degrees and the head
of
the
arrow
marked
on
the
pivot pin
should be
set
only between
the
arrows on
the
are
marked
on
the drive end bracket.
0.
Tighten
the locknut
to
secure
the
pivot pin.
After
setting
the
pinion
travel, check the
opening
and
closing
of
the
starter
switch
contacts
as
follows:
a.
Connect
10-volt
supply,
with
a
switch
in
circuit,
between the
small
unmarked
solenoid
terminal
and
earth.
b.
Connect
a
separately energized
test
lamp
circuit
across
the solenoid
main
terminals.
0.
Insert
a
stop
in
the drive end bracket
to
restrict
the
pinion
travel
to
that of the
normal
out-of-mesh clearance.
d. Close the switch
(the
period of
energization
should be
as
brief
as
possible
to
avoid
over-heating the
series
winding).
The
test
lamp
should
now
give
a
steady light indicating that the
solenoid
contact
is remaining
fully
closed.
e.
Switch off and
remove
the
stop.
f.
Switch
on,
hold the
pinion
assembly
in
the fully
engaged
position
and switch off.
The
test
lamp
should
now
go
out
indicating that the solenoid
contacts
have
opened.
Bench
testing
LIGHT
RUNNING
TEST
35.
Using heavy-gauge cables,
connect
the
starter to
a
fully charged
12-volt 120-amp.-hour battery with
a
switch and
ammeter
in
circuit.
The
starter
motor
should
run
freely
at
5,800
to
6,500
rpm.
with
a
current
consumption
of
70
amps.
TORQUE TEST
36.
Check the lock
torque
and
running
torque,
against
the
■gures
given in
‘GENERAL DATA’.
Refitting
37. Reverse
the procedure
in
1
and
5.
Section N.29
CONTROL UNIT
(Lucas
Type
4TR)
Testing
1.
Check that the alternator
is
functioning
correctly
as
described
in
Section N25
1
to
8.
N36
2. Check that the batteries
are
in
a
fully
charged
state;
if
not,
temporarily
connect
fully
charged replacements.
3. Connect
an
accurate
voltmeter
across
the
battery
terminals.
4.
Connect
a
0—40
amp.
ammeter
in
series
with
the
alternator
main
output
cable.
5. Start the
engine
and
run
it
at
2,750
rpm.
until
a
steady
ammeter
reading of
not
more
than 5
amps.
is
obtained.
At this
setting
the
voltmeter
should
give
a
steady reading of
14.3
to
14.7 volts. If
the voltmeter
reading
is
unsteady
or
is
outside the
limits
given,
the
control
unit
must
be
renewed.
Removing
6.
Disconnect the
positive
connection
from
the
battery
terminal.
7. Withdraw
the
terminal
connector
block
from
the
control
unit.
8.
Remove the
control
unit
securing
screws
and
remove
the
unit.
Refitting
9. Reverse the
removing
procedure
in
6
to
8.
Section N30
SWITCHES
(GHNS
and
GHDS
cars
from
Car No. 258001)
Removing
IMPORTANT.—
Disconnect
the batteries
before
attempting
to
remove
any
of the
switches
and
refer
to
the
wiring
diagram
and
switch
contact
numbers
when
refitting
the
switches.
HEATER,
WIPER,
AND LIGHTING
SWITCHES
1.
Remove
the face
level
vents■section
R35.
2. Disconnect the
wiring
from
the
back of the
switches.
3. Using
tool 18G
1202
press
in
the four
retaining
lugs
and withdraw
the heater
and
wiper switches.
4. To
remove
the
lighting switch,
depress the
retaining
lugs
on one
side of the
switch,
ease one
side of the
switch
through the
aperture,
depress
the
retaining
lugs
on
the other side and withdraw
the
switch.
CONSOLE
SWITCHES
5. Remove the console—Section
R34.
6. Using tool
18G
1202
press
in
the four
retaining
lugs
and withdraw the
switches.
MGB.
Issue8.
82448
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