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N
THE
ELECTRICAL EQUIPMENT
to connect
the
dynamo
terminal
·o·
to the control
box terminal 'D' and the dynamo terminal 'F'
to
the control box
terminal
'F'.
Remove
the
lead
from
the
•o·
terminal on
the
control box and
connect
the
voltmeter between
this
cable and a
good earthing point on the vehicle.
Run
the engine
as before. The
reading should
be the
same
as
that
measured
directly
at
the dynamo. No reading on
the voltmeter
indicates a break
in
the cable to the
dynamo.
Carry out
the
same
procedure for
the
'
F'
tumioal,
connecting
the
voltmeter between
cable and earth.
Finally,
remo,·e the
link from the
dynamo.
If the reading is correct test
the
contro
l
box
(Section
N.9).
Section N.3
REMOVING
AND
REPLACING
THE DYNAMO
To
remove
the dynamo,
d isconnect the dynamo
leads
from
the dynamo
terminals.
Slacken all
four
attachment boiLS and pivot
the
dynamo
towards
the cylinder
block
to
enable
the
fan
belt
to be
removed
from the
dynamo pulley. The dynamo
can then
be
removed
by
completely
re.
m
oving
the two
upper and
one
lower a
ttachment
bolts.
Replacement
of the
dynamo
is an exact
reversal of
this
procedure.
Section N.4
DISMANTLING
THE
DYNAMO
Remo•·e the securing nut and take of!' the drive
pulley.
Remove the
Woodru/1'
key from the commutator shan.
·2
3
6
Un~
and remove the
two
through-bolts
and
take
off tbe commutator end
bracket. The driving
end
brac:lcet, together v.ith
the
armature
and ita ball
bea.
r
ing,
can
now
be lifted
out of
the
yoke. Unless the ball bearing
is damaged
or requires
attention,
it need not be removed
from the armature.
Should
it
be
necessary
to
remove
the bearing. the
armature
must
be
separated from the end
bracket by means
of a
hand
press.
Reassembly
of the
dynamo
is
a re•·cnd of
the
dis-
mantling
procedure,
except that when assembling the
commutator
end
bracket the brushes must first be held
clear
of
the commutator by partially withdrawing
them from
their
boxes
until each brush is
trapped
in
position
by
the
side
pressure
of its spring. The brushes
can
be released onto the
commutator by a small screw·
driver
or similar
tool
when the
end
bracket
is assembled
to
within
about
l
in.
(12·7
mm.)
of
the yoke.
Before
closing the
gap
between the
end
braclcct and
the
yoke
see that the springs are
in
correct contact
with
the
brushes.
Section N.S
SERVICING
T
H
E
DYNAMO
Bnsloes
Test if
the
brushes
are
sticking.
Clean them with
petrol
and,
if
necessary,
case
the
sides
by lightly
polishing
with a smooth
file. Replace
the brushes
in tbeir
original
positions.
7
10
'
3'
'
..
15
16
91311E
Fig. N
.!
N.6
1.
relt
l"'d.
2.
A
lumin1
um d isc.
3.
Bronze
bush.
4.
Fibre \ll
<
asher.
S.
Conunutator.
6.
Field coils.
The windowless
y oke
dynamo
7.
Armature.
8.
Shan
key.
9,
Bearing.
10.
N:lt
w.,hc:r,
II
.
O il-retaining
wash«.
12.
Commutator
end bracket.
I
3.
F •eld tenninal
post.
14.
Bearing
rcta inina
plate.
15.
CUp
washer.
16.
Corrugated
wasbcr.
17.
D riving end
bmckcl.
MGA (Tv.
in
C
um).
Issue !.
23026
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