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(b)
If the engine can be turned by hand, first check that the trouble is not due to a discharged
battery.
(c)
Examine the connections to the batteries, starter and starter switch, making sure that they are
tight and that the cables connecting these units are not damaged.
(d)
It is also possible that the starter pinion may have jammed in mesh with the flywheel, although
this is by no means a common occurrence. To disengage the pinion, rotate the squared end of
the starter shaft by means of a spanner.
2. Starter operates but does not crank engine
This fault will occur if the pinion of the starter drive is not allowed to move along the screwed sleeve
into engagement with the flywheel, due to dirt having collected on the screwed sleeve. Remove the
starter and clean the sleeve carefully with paraffin (kerosene).
3. Starter pinion will not disengage from flywheel when engine is running
Stop the engine and see if the starter pinion is jammed in mesh with the flywheel, releasing it if
necessary by rotation of the squared end of the starter shaft. If the pinion persists in sticking in mesh,
have the equipment examined at a Service Depot. Serious damage may result to the starter if it is
driven by the flywheel.
LIGHTING CIRCUITS
1. Lamps give insufficient illumination
(a) Test the state of charge of the battery, recharging it if necessary from an independent electrical
supply.
(b) Check the setting of the lamps.
(c) If the bulbs are discoloured as the result of long service, they should be renewed.
2. Lamps light when switched on but gradually fade out
As paragraph 1 (a).
3. Brilliance varies with speed of car
(a) As paragraph 1 (a).
(b) Examine the battery connections, making sure that they are tight, and renew any faulty cables.
WINDOWLESS YOKE DYNAMO
Engines numbered from 487 are fitted with a new dynamo (Part No. 11G220) without brush gear
inspection windows (see Fig. N.17). Access to the brush gear in these dynamos is gained by undoing
the two through bolts and withdrawing the commutator end bracket. Every 12,000 miles (19200 km.)
the unit should be partially dismantled for the inspection of brush gear and commutator.
To check the brush spring tension, the yoke should be completely withdrawn from the armature and
the commutator end bracket refitted to the shaft.
When reassembling a windowless yoke dynamo, the brushes must first be held clear of the
commutator in the usual way, i.e. by partially withdrawing the brushes from their boxes until each
brush is trapped in position by the side pressure of its spring. The brushes can be released onto the
commutator with a small screwdriver or similar tool when the end bracket is assembled to within about
in. (13 mm.) of the yoke. Before closing the gap between the end bracket and yoke, see that the
springs are in correct contact with the brushes.
Coil steady plate, Part No. 11G221, should always be used with dynamo, Part No. 11G220.
N.29 MODIFIED CONTROL BOX
A modified C.V.C. control box, model RB106/2, with revised settings (Part No. AHH5356) is introduced
on later cars. Servicing instructions remain as before (see Section N.9), but adjustments must be
made within 30 seconds, otherwise heating of the shunt winding will cause false settings to be made.
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