MG MGB User Manual

N
THE
ELECTRICAL
SYSTEM
Section
N.25
ALTERNATOR
(Lucas
Type
16AC)
Fig N25
The 16AC alternator
components
Testing in
position
-
-
1. Cover.
9. Field windings.
1.
Check
that the
fan belt
1s
correctly
tensroned‘and that
2‘
Recti■et pack. 10'
Drive
end bearing.
all charg1ng
cucurt
electrlcal
connections
are
tight.
3_ Throughbolt 1L
Chum
2.
Run
the
engine
at
fast idle speed until normal
4.
Slip-ring end
bracket. 12.
Oil sealing
ring.
operating
temperature
is
reached.
:- gut-“giggs
313?:33‘3'3’301‘91-
3.
Stop
the
engine
and withdraw
the moulded terminal
7:
■lming
{and
healing
15:
Brush
b0);
moulding
connector
block
from
the
alternator.
8.
Rotor.
16. Brush assembly.
I
2
3
4
5
6 7
8
9
[0
ll I2
[3
l4
4.
Connect
test
equipment
to
the alternator terminals
as
I
shown
in
Fig. N26.
The variable
resistance
must
only
be connected
across
the battery for the
amount
of
time
necessary
to
carry
out
these
tests.
IMPORTANT—Ensure
that the
correct
battery and
alternator polarity
is
preserved.
Serious damage
to
the
alternator will result if the polarity
is reversed.
5.
Start the
engine
and check the alternator
output.
a.
Run the
engine
at
850
r.p.m.
and observe the
test
bulb; the bulb should be extinguished.
b. Increase the
engine
speed
to
3:300
r.p.m.
and
adjust
the
variable
resistance
until
a
reading of
14 volts
is
registered
on
the
voltmeter;
at
these
settlngs
the
ammeter
should
register
a
reading of
approximately 34
amps.
If
the
test
bulb does
not
extinguish
or
its
brilliance
fluctuates,
or
if the
amrneter
reading
varies
DOB6ZB
considerably
from the
correct
reading,
a
fault
on
the
-
alternator
is
indicated and
the
alternator
must
be
removed for further
tests.
Fig.
N.26
Failure of
one or more
of
the diodes will affect the
16AC
“Hermit”
ontp‘"
test “mu”
alternator
output
and
in some
instances
raise
the
1.
Alternaton
4. 0_15
ohm, 354mm
variable
alternator
temperature
and
norse
level.
The
followrng
2.
0—40
amp.
ammeter.’ resistance,
table indicates
the effects that
diode
failure
may
have
3.
12-V01t,2-2-watt
bulb.
5. 0—20
volt
voltmeter.
on
test
results.
6-
12-V01t
battery-
le
MGB.
lssue7.
25729

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English