-
I
Dynamo Maintenance
Examine the commutator, which should be free from any trace of oil or dirt and
should have a highly polished appearance. Clean a d~rty or blackened commutator
by pressing a clean dry cloth against
it
whilst the engine
is
slowly turned over by
means of the kickstarter crank.
(It
is an advantage to remove the sparking plugs
before doing this). If the commutator is very dirty, moisten the cloth with petrol.
I
MAGNETO
The magneto
is
of rotating armature pattern, having its magnit cast into the body.
so eliminating joints and improving the weatherproof properties of the magneto.
The ignition timing is controlled by a manual lever situated on the handlebar.
,
...
I..
.
Lubrication-Every 3,000 miles (5,000 kms.). The cam
is
supplied with lubricant
from a felt pad contained in a pocket in the contact breaker housing.
A
small hole
in the cam fitted with a wick, enables the oil to find
its
way to the surface of the cam.
Remove the contact breaker cover, turn the engine over until the hole in the cam
can be clearly seen and then carefully add a few drops of thin machine oil. Do not
allow any oil to get on or near the contacts. If the cam ring
is
removed, the wick
should be taken out and soaked in thin machine oil. Wipe the 'wick to' remove
surplus oil, before replacing.
. .
The contact breaker.rocker arm pivot also requires lubrication and the complete
contact breaker must be removed for this purpose. Take out the hexagon-headed
screw from the centr.e of the contact breaker and carefully lever the contact breaker
off the tapered shaft on which
it
fits. Push aside the rocker arm retaining spring,
I~ft off the rocker arm and lightly smear the pivot with Mobilgrease No.
2
or an
equivalent grease.
Remove the cam ring, which
is
a sliding
fit
in
its
housing, and lightly smear inside and
outside surfaces with Mobilgrease No.
2.
Removal and re-fitting of the cam can be
made easier if the handlebar control lever is half retarded, thus taking the cam away
from
its
stop pin. Allow one or two drops of thin machine oil to the felt cam
lubricator in the housing. Re-fit the cam, taking care that the stop peg in the
housing and the timing control plunger engage with their respective slots.
.
.
If an earthing brush
is
fitted at the back of the contact breaker base, see that
it
is
clean.and can move freely in
its
holder, before re-fitting to the contact breaker.
When replacing the contact breaker, take cqre to ensure thdt the projecting key on
the tapered portion of the contact breaker base engages with the keyway cut in the
1
magneto spindle, otherwise the timing of the magneto will be affected. Replace the
contact breaker securing screw and tighten with'care.
;:
1;
.
.
The armature bearings are packed with grease during assembly and
will
[lot need
i
:
attention until the motorcycle is dismantled for general overhaul, when
it
is advisable
!I
i
to have the magneto inspected by
a
Lucas Service Depot.or Agent.
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