Perkins New 1000 Series Workshop Manual page 336

14
New 1000 Series
Starter motors
General description
The Magneti Marelli M127 starter motor is operated by a solenoid and has a six roller clutch. The solenoid
engages the starter drive in two operations to ensure that the motor gets its maximum torque only when the
starter motor is engaged fully with the flywheel. The clutch prevents rotation of the armature at high speed if
the starter is held in the engaged position.
The Lucas/Delphi S115 starter motor has a smooth surface with no protrusions. This is because the solenoid
and the main switch assemblies are inside the drive end cover around (co-axially with) the armature shaft. The
main feature of the co-axial starter is that only the pinion assembly moves axially to engage the engine
flywheel. There is no axial movement of the whole armature as with the axial type motor. To ensure smooth
engagement of the pinion, full load is not applied until the pinion is completely engaged with the flywheel.
322 Workshop Manual, TPD 1350E, Issue 4
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