ELECTRICAL
EQUIPMENT
(b)
Testing
in
Position to Locate
Cause
(d) High Tension Circuit
of Ignition Failure
If the low tension circuit is in order,
Spring back the clips on the distri-
remove the high tension lead from the
butor head and remove the moulded
centre terminal of the distributor cover.
cover.
Lift
off the rotor, carefully
Switch on the ignition and turn the
levering with a screwdriver if neces-
engine
until
the contacts close. Flick
SW.
open the contact breaker lever whilst
Switch on the ignition and whilst the
the high tension lead from the coil is
engine is slowly cranked, observe the
held about
A''
from the cylinder
reading on the car ammeter, or on an
block. If the ignition equipment is in
ammeter connected in series with the
good order, a strong spark
will
be ob-
battery supply cable.
tained. If no spark occurs, a fault in
The reading should rise and fall with
the circuit of the secondary winding of
the coil is indicated and the coil must
the closing and opening of the contacts
if
the low tension wiring is in order.
be replaced.
When a reading is given which does
The high tension cables must be
care-
not fluctuate, a short circuit, or con-
fully examined and replaced if the
tacts remaining closed, is indicated. rubber insulation is cracked or
No reading indicates an open circuit perished, using
7
mm.
rubber covered
in the low tension circuit, or badly ignition cable.
adjusted or dirty contacts.
The cables from the distributor to the
Check the contacts for cleanliness and sparking plugs must be connected in
correct gap setting as described in the correct firing order,
i.e.
1.3.4.2.
Para.
2
Cb).
Ensure that the moving
arm
move$ freely on the pivot.
I'f
sluggish, remove the arm and polish
the pivot post with a strip of fine emery
cloth. Smear the post with Ragosine
Molybdenised non-creep oil or Mobil-
grease No. 2, replace the arm. If the
fault persists, proceed as follows
:
(c) Low Tension Circuit
-
Fault
Location
(i)
No reading in ammeter test.
Refer to wiring diagram and check
circuit for broken or loose con-
nections, including ignition
switch. Check the ignition coil by
substitution.
(ii)
Steady reading in ammeter
test
Refer to wiring diagram and check
wiring for indications of a short
circuit.
Check capacitor (either by sub-
stitution or on a suitable tester).
Check ignition coil by substitution.
Examine insulation of contact
breaker.
(e) Dismantling
When dismantling, carefully note the
positions in which the various com-
ponents are fitted, in order to ensure
their correct replacement on re-
assembly. If the driving dog or gear is
offset. or marked in some way for
convenience
in
timing, note thk re-
lation between it and the rotor elec-
trode and maintain this relation when
re-assembling the distributor. The
amount of dismantling necessary
will
obviously depend on the repair
required.
Spring back the securing clips and
remove the moulded cover.
Lift
the
rotor arm off the spindle, caref'ully
levering with a screwdriver
if
it is
tight.
Disconnect the vacuum unit
link
to
the moving contact breaker plate and
remove the two screws at the edge of
the contact breaker base. The contact
breaker assembly, complete
with
external terminal,
can
now be lifted off
(see
(i)
below). Remove the circlip on
the end of the micrometer
timing
screw and
turn
the micrometer nut
until
the screw and the vacuum
unit
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