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Starter Motor - Model - CA45
General Description
Designed for flange mounting, the C.A.45 starter motor has a uniform cylindrical shape with no surface protrusion. This is because the solenoid and main switch assemblies are housed within the drive end-shield, around (i.e., co-axially with) the armature shaft.The essential feature of the co-axial starter is that, the pinion alone moves axially to engage the engine flywheel. There is no longitudinal movement of the whole armature assembly, as in the axial types.Smooth engagement of the pinion with the engine flywheel is constantly ensured by using two-stage operation of the solenoid and switch mechanisms. Thus the risk of damage to both pinion and flywheel, through faulty meshing, is practically eliminated.In construction, the starter consists of three main sections, into which it can be easily dismantled.1. The solenoid switch-gear and pinion assembly housed in the drive end-shield.2. The armature, shaft and commutator assembly.3. The yoke, pole-piece and field-coil assembly.Ready access is possible therefore, to those parts most likely to require adjustment, such as the switchgear and commutator assemblies.The starter is designed for working off a 12 volt supply, with 17 amps solenoid current.Testing on the Vehicle
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 kerosene 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. On some engines it is often helpful to depress the clutch when starting.5. 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 Shelltella T27 or BP Energol SHF 100 oil should be added through the oil plug.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 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 is inclined to stick, remove it from its holder and clean the sides with a petrol moistened cloth.Be