Clean points with an abrasive strip or alternatively fine grade emery
cloth. Pass a strip of clean paper, or rag soaked in petrol, across the points
after cleaning.
Check free movement of contact breaker arm on its pivot,
Adjusting contact breaker gap. This adjustment is effected by altering
the position of the plate for the fixed contact point by:
(1) Releasing slightly the locking screw.
(2) Adjust the gap by turning the eccentric screw (close to the fibre pad)
in the required direction, with the fibre pad on the rocker arm on the
cam lobe (maximum separation) .012". Retighten the lock screw when
adjustment is correct.
Lubrication. The felt pad should be impregnated with H.M.P. grease.
Use sparingly, an excess can affect contact points surface.
Before replacing the contact breaker cover, check the condenser fixing
for security.
If attention to the contact breaker fails to produce a spark, check the
circuit by:
Switch on the ignition, rotate the engine very slowly until the contact
points close. A discharge between three to four amps will be shown on the
ammeter if current is passing,
As the ammeter is not closely calibrated, a more accurate check can be
made by using the d.c. ammeter in between the brown battery wire and
its connector.
If a discharge is not shown on the ammeter with contact points closed,
this indicates current is not passing through the primary windings in the
h.t. coil.
With ignition switch on check the dark green wire attached to the coil
by:
Removing this wire from the coil terminal.
Connect one side of the d.c. voltmeter to the end of the dark green
wire, the other side of the meter to earth.
If there is no reading on the meter, check the ignition (black) plug in
the headlamp.
If the interna] insulated wire bridge across two of the plug terminals
(see wiring diagram) is fractured or disconnected, this will allow the en-
gine to start with the switch on either emergency or ignition, but not in
both positions, as one switch connection is out of circuit.
Renew the bridge connection.
Ignition coil test.
(1) Use a battery with one wire attached to the d.c. voltmeter with a
short length of wire attached to the other voltmeter terminal.
(2) Disconnect the two wires attached to the coil, also the h.t. cable.
(3) Use a further wire on the second battery terminal. Connect the
free end of this wire, also the meter wire across the coil terminals. If
there is continuity, a reading will show on the meter indicating the
primary winding is in order.
(4) Transfer one wire from the coil terminal to the centre h.t. connec-
tion, if there is continuity a lower voltage reading will show by reason of
the higher resistance of the secondary winding.
108
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