MG MGB User Manual

THE
COOLING
SYSTEM
.11?
15.
16.
17.
(17
3NCB44B
Radiator fan
motor components
1.
Assembly
marks 5. Circlip
2.
Motor yoke
6.
Thrust
washer
3.
Through-bolts 7.
[■nd
cover
4.
Armature 8.
Bowed
washer
Connect
a
110-volt
a.c.
supply with
a
15-watt
test
lamp
in circuit
between
the
armature
shaft and
one
of
the
commutator segments.
If
the
test
lamp lights,
the
armature
insulation
is
faulty
and the
armature
must
be
renewed.
Check
the
armature
inter-winding
for
short
circuits,
using Growler
test
equipment.
Clean
the
commutator.
using
a
petrol-moistened
cloth;
if
necessary
refinish
the
commutator,
using
very
fine
glass-paper.
A badly burned
or worn
commutator
should
be
skimmed
lightly
in
a
lathe. After
skimming,
clean
the
copper
swarf from
the inter-segment
spacers.
CAUTION:
Do
not
undercut
the
commutator
segments.
Reassembling
18.
Reverse
the
procedure
in 5
to
14,
noting:
a.
Lubricate
sparingly
the bearing
bushes
and
the
armature
shaft
bearing
surfaces
with
Shell
Turbo
41
oil.
.
b.
Ensure
that the
assembly
marks
on
the
yoke
and
the
end
cover are
in
line.
c.
Fit
the
bowed
washer
between
the
two
shim
washers.
d. Tighten
the through-bolts
to
14 lbf
in
(0.17
kgf
m).
19.
Test
the
fan
motor,
see
Section
C.13.
Refitting
20. Reverse the
procedure
in 1
to
4,
ensuring
to
fit
the
C.12
motor to
the
mounting
bracket
so
that
the
fan
blades
9.
Circlip
10. Shims
ll.
Brush
carrier
12. Screws■brush
carrier
end of
the
motor
body
protrudes
2
in
(50.8
mm)
from
the
mounting bracket.
Section
C.l3
Test
."
FAN MOTOR
TEST
(GHNS
and GHDS
cars
from
Car No.
410002)
Remove
the fan
motor,
see
Section
C.12.
Slacken
the
grub
screw
and
remove
the fan blades.
Connect
the
motor
to
a
13.5-volt
d.c.
supply
with
a
moving-coil
ammeter
in
series and check
that
the
motor
light
running
current
does
not
exceed 3
amps
'after
60
seconds
from
cold.
Check
that
the light
running
speed
is
between
3,500
and 4,000 rev/min
at
13.5V after
60
seconds
from
cold.
‘.
'
If
the
motor
current
consumption
and
speed
are
low,
a
dirty
commutator
or
faulty
brush
gear
is indicated.
If
the
current
consumption
is
high after
the
motor
has
been
dismantled
and reassembled,
misalignment
of
the
end
cover
bearing
may
be the
cause,
this
can
be
corrected
by
applying
a
series
of light
blows
to
the
side
of
the
motor
end
cover
only,
using
a
hide
or
wooden
mallet. If
this does
not
correct
high
current
consumption,
a
faulty
armature
is
indicated.
Re■t
the
fan
blades.
Re■t
the fan
motor.
MGB.
Issue
1. 91427

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English