GM 1988717 Starter Motor, Remanufactured

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For an overhaul, start by removing the starter from the vehicle and disconnecting the field coil straps from the solenoid. Remove the through-bolts to separate the commutator end frame, field frame assembly, drive housing, and armature assembly. On diesel starters, remove the insulator from the end frame and the shift lever pivot bolt. On 25 MT diesel starters, remove the center bearing screws and the drive gear housing from the armature shaft. Slide off the 2-piece thrust collar from the armature shaft and use a piece of pipe or socket to drive the retainer toward the snapring. Remove the snapring with pliers and slide off the retainer and starter drive. To reinstall, lubricate the armature shaft and install the starter drive and retainer. Place the snapring on the shaft and tap it into place. Slide the retainer and thrust collar onto the shaft and squeeze them together with pliers. Lubricate the drive housing bushing and engage the shift lever yoke with the clutch. Install the drive assembly into the drive gear housing and reassemble the remaining components.

Use the identification coding.

If the brushes are worn down to half their original length and need replacement, disconnect the leads from the brushes.

The first step to install the brush assembly to the field frame is to install the brushes to their holders.

The solenoid may be defective or the solenoid circuit open.

Raise the vehicle and support it with jack stands.

Ensure that the speed selector lever is in 'N' or 'P' for automatic transaxle or that the clutch pedal is depressed for manual transaxle if the starter motor does not rotate when operated. Verify that the battery is charged and all cables, at both the battery and starter solenoid terminals, are secure. If the motor can be heard spinning but the engine isn't cranked, the overrunning clutch in the starter motor is likely slipping, requiring removal and dismantling. If the starter motor doesn't operate, but a loud 'click' is heard from the solenoid plunger, the fault lies in the main solenoid contacts or the starter motor itself. In cases where the solenoid plunger doesn't move, the solenoid may be defective or the solenoid circuit open. You can check the solenoid by connecting a jumper lead between the battery (+) and the 'S' terminal on the solenoid. If the starter motor operates, the fault lies in the ignition or neutral start switches or their interconnecting wiring. If it doesn't, the starter/solenoid assembly should be removed for testing and repair. If the engine cranks at an unusually slow speed, check the battery charge and terminal connections, oil grade, and ensure no mechanical fault within the power unit. Run the engine to normal operating temperature, disconnect the battery feed wire to the distributor cap to prevent engine firing during cranking, then connect a voltmeter positive lead to the starter motor terminal of the solenoid and the negative lead to ground. Ignite the switch, take the voltmeter readings once steady, but don't let the starter motor turn for more than 30 seconds at a time. A reading of 9 volts or more with normal cranking speed indicates a good condition, while the same voltage but slow cranking speed denotes a faulty motor. A reading of less than 9 volts with slow cranking speed suggests the solenoid contacts are likely at fault and should be replaced.

Raise the vehicle and support it with jack stands.

To begin the disassembly of the starter motor, disconnect the starter motor field coil connectors from the solenoid terminals and unscrew and remove the through bolts.

Smear silicone oil onto the drive end of the armature shaft and then slide the clutch assembly (pinion to the front) onto the shaft. After that, slide the pinion stop/retainer onto the shaft with its open end facing away from the pinion.

No, the overrunning clutch cannot be repaired. If it is faulty, it must be replaced as a complete assembly.

Run the engine to normal operating temperature, disconnect the battery feed wire to the distributor cap to prevent engine firing during cranking, then connect a voltmeter positive lead to the starter motor terminal of the solenoid and the negative lead to ground. Ignite the switch, take the voltmeter readings once steady, but don't let the starter motor turn for more than 30 seconds at a time. A reading of 9 volts or more with normal cranking speed indicates a good condition, while the same voltage but slow cranking speed denotes a faulty motor.

To check the pinion clearance, connect a battery between the solenoid S terminal and ground and at the same time fix a heavy connecting cable between the MOTOR terminal and ground.