Overhaul of m. marelli starter motor

OVERHAUL OF M. MARELLI STARTER MOTOR

Before proceeding with overhauling the starter motor, check that any insufficient engagement torque on starting is not due to low battery charge conditions.

Disassembly

To dismantle the starter motor, proceed as follows:

• undo the nut (1) and release the cable (2) from the solenoid (3);
• undo the bolts (4) securing the solenoid (3) to the front end bracket (5);
• remove the brush protective band (6);
• undo the nuts (7) and remove the bolts which join the front end bracket (5) to the central casing (8) and the brush carrier (9);
• separate the various components and release the yoke (10) from the front end bracket (5) and the armature (11).

Checks

Conduct the following tests on the components of the starter motor:

armature: continuity, short circuit and earth insulation tests

stator: continuity and earth insulation tests

brush carrier: earth insulation

solenoid: continuity and earth insulation tests

The roller clutch (12) must be replaced whenever the starter motor engagement is noisy during starting.