ELECTRICAL EQUIPMENT—Q.13
Testing on the Application
Ensure that the battery is in a charged condition.
Switch on the lamps and operate the starter button. If
the starter fails to function, but the lights maintain full
brilliance, check the switch and battery connections to
the starter and all external leads. Sluggish action of the
starter can be caused by a poor or faulty connection.
Difficulty in smooth engagement between starter and
engine flywheel is probably due to dirt on the starter-
shaft helices preventing free pinion movement. The
shaft should be thoroughly cleaned with cleaning fluid
followed by the application of a small quantity of Caltex
Thuben 90 or SAE 90 oil.
OPERATING THE STARTER
When starting the engine the following points
should be rigidly observed
1.
Press the starter button firmly and release it
immediately the engine fires.
2.
If the engine does not fire at once, let it come to
rest before pressing the switch again.
3.
Do not run the battery down by keeping the
starter switch pressed when the engine refuses
to start. Ascertain the cause.
4.
Do not operate the starter when the engine is
running as serious damage may occur to both
starter and flywheel.
MAINTENANCE
LUBRICATION
The large oil reservoir in the drive end shield need only
be replenished during overhaul periods, when a supply
of BOLIVIO oil should be added through the oil plug (7).
An oil impregnated sintered bronze bush is fitted at the
commutator end, and needs no further attention.
BRUSH GEAR AND COMMUTATOR
Inspect the brushes at intervals of approximately 2.500
hours. See that they are free in their guides and that the
leads are quite free for movement, by easing back the
brush springs and pulling gently on the flexible
connections. If a brush
Fig. Q.11.
Internal Wiring Diagram.
is inclined to stick, remove it from its holder and clean
the sides with a petrol moistened cloth.
Be sure to refit the brushes in their original positions to
retain the "bedding." The brushes should he well bedded
(i.e. worn to the commutator periphery) but if not, wrap a
strip of very fine glass or carborundum paper firmly
around the commutator with the abrasive side outwards.
With the brushes in position, rotate the armature by hand
in the normal working direction of rotation; until the
correct brush shape is obtained. If the brushes are worn
down so that the springs are no longer providing
effective pressure, they should be renewed. Check the
brush spring pressure by hooking a spring balance
under the spring lip.
The correct tension is 30—40 ozf (0,9—1,1 kgf).
It is essential that replacement brushes are the same
grade as those originally fitted. Genuine spares should
always be used. To remove the brushes, unscrew the
four fixing screws. one to each brush. In re-assembling
care must be taken to re-connect the field coil and
interconnector leads, held by two of the fixing screws.
Before inserting brushes in their holders, it is advisable
to blow through the holders with compressed air or clean
them with a cloth moistened with petrol.
