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PART
14-4
LUCAS STARTING SYSTEM
Section
1 Removal and Installation
3 Major Repair Operations
.....
.
DESCRIPTION
The Lucas starting motor model
M40AK is a pre-engaged, four pole,
four
brush,
four
inch diameter
machine
with
a
series
parallel
connected field,
an
armature with
a face type commutator and a
solenoid operated roller clutch drive.
The face type commutator on the
end face of the armature works in
conjunction with a fully insulated
brush bear assembly comprising two
pairs of brushes and coil type springs
assembled into a brush box moulding
attached to the inside of the end
cover by two Phillips head screws
which also act as
earth
returns for
the starter earth brushes.
OPERATION
Closing the solenoid switching
circuit energises the pull in and hold
in solenoid windings. The soft iron
plunger is drawn in moving the
engaging lever which in turn moves
the drive assembly towards the ring
gear.
The helical splines on the
armature shaft rotate the pinion
slowly to assist in engagement.
Should a tooth of the advancing
pinion abut a tooth of the ring gear,
the engaging lever will compress the
helical spring at the pinion until
the switch contacts close. The pinion
is then turned and engages with the
ring gear under the helical spring
pressure.
REMOVAL & INSTALLAT
ION
1. Disconnect the starter cable
at the starter motor terminal, remove
the flywheel housing to starter retain-
ing
screws.
Remove
the starter
assembly.
2. Position the starter assembly
to the flywheel housing and start the
Page
14-13
14-14
FIG.
1 -Lucas Starting Motor
FIG. 2- Wiring Diagram M40AK Starting
Motor.
14-13
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