Triumph TR6 PI Operation Manual page 488

Motor
A conventional, four pole, four brush motor with a
shaft which carries a roller clutch drive.
The armature shaft rotates in two porous bronze
bushes. The armature features a conventional cylindrical
commutator.
Shaft end float is controlled at the commutator end
bracket by a steel thrust washer and a fabric thrust washer.
ELECTRICAL
The yoke has four windows and is fitted with an external
cover band. The yoke and commutator end bracket are
secured by two through bolts which screw into tappings
provided in the fixing bracket.
Solenoid and
roller clutch drive
The starter solenoid is integral with the starter motor.
The-solenoid contains a heavy pull-in winding and a light
hold-in winding. Applying battery voltage to the unmarked
'WR wire' connector initially energizes both windings. The
combined action of both windings pulls in the plunger to
cause engagement of the pinion and contact of the main
terminals. The pull-in winding is now shorted-out leaving
the hold-in winding to maintain the plunger position.
Contact of the main terminals energizes the motor.
The roller clutch drive locks up and the engine is cranked.
Firing of the engine rotates the pinion at high speed.
The roller clutch drive is over-ridden and damaging
high-speed rotation of the armature does not occur.
5
7
6
8
9
9
J082
Driver release of the ignition/starter switch allows the
solenoid plunger to move out under spring pressure.
Contact of the main terminals is broken and disengagement
of the pinion occurs.
I. Unmarked 'WR wire' connector
2. Pull in winding
3. Hold in windlI1g
4. Plunger
5. Solenoid battery terminal
6. STA terminal
7. IGN connector for ballast
ignition when fitted
8. Motor lead
9. Fie:d windings
10. Field winding brushes
I I. Commutator
12. Earth brushes
FI9
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Triumph TR6 Manual. Part No. 545277 Issue 1
86.60.00 Sheet 2