GM Metro/Sprint 1985-1993 Repair Guide

Starter

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Four types of starter motor are utilized depending upon the vehicle transaxle and assembly plant location. Manual transaxle equipped vehicles utilize a conventional starter motor which consists of a yoke, an armature assembly, an overrunning clutch assembly, a solenoid, a commutator end cover, a brush holder and a pinion drive lever. Automatic transaxle equipped vehicles utilize a reduction type starter motor which has, in addition to the components found on conventional starter motors, a reduction gear and shock absorber assembly.

In the basic circuit, the solenoid windings are energized when the ignition switch is turn to the START position and the clutch start/neutral safety switch is closed. The resulting plunger and shift lever movement causes the pinion to engage the engine flywheel ring gear. This movement also causes the starter solenoid contacts to close.

With the contacts closed, the starter solenoid provides a closed circuit between the battery positive terminal and the starter motor. Because the starter motor is permanently grounded to the engine block, the circuit is complete and cranking occurs as soon as the starter solenoid contacts are closed.

When the engine starts, the pinion is designed to overrun and protect the armature from excessive speed until the ignition switch is released from the START position. With the ignition switch released, a return spring in the solenoid assembly forces the starter solenoid contacts open, breaks the circuit between the battery and the starter motor, and disengages the pinion. To prevent prolonged overrun, the ignition switch should be immediately released upon engine start-up.

See Figures 1 and 2



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Fig. Fig. 1: Electrical system diagnosis - No cranking condition



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Fig. Fig. 2: Electrical system diagnosis - Slow cranking condition

REMOVAL and INSTALLATION

See Figure 3



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Fig. Fig. 3: Starter motor assembly

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle safely.
  4.  
  5. Label and disconnect the starter solenoid electrical connector.
  6.  
  7. Remove the mounting bolts from the starter motor, then carefully lower the assembly from the vehicle.
  8.  

To install:
  1. Install the starter motor assembly complete with any shims that may be used between the engine block and the starter.
  2.  
  3. Install and tighten the starter mounting bolts to 17 ft. lbs.. (23 Nm).
  4.  
  5. Connect the starter solenoid electrical connector.
  6.  
  7. Lower the vehicle and connect the negative battery cable.
  8.  

SOLENOID REPLACEMENT



See Figure 4



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Fig. Fig. 4: Starter motor solenoid assembly

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the positive battery cable from the starter.
  4.  
  5. Label and disconnect the solenoid electrical connectors.
  6.  
  7. Scribe matchmarks on the solenoid and drive housing to ensure proper solenoid installation.
  8.  
  9. Remove the nut and field coil lead wire from the solenoid.
  10.  
  11. Remove the screws and solenoid from the starter.
  12.  

To install:
  1. Lightly grease solenoid plunger.
  2.  
  3. Install solenoid to starter aligning housing matchmarks.
  4.  
  5. Install screws and tighten securely.
  6.  
  7. Install field coil lead wire to solenoid and secure with retaining nut. Tighten to 89 inch lbs.. (10 Nm).
  8.  
  9. Install the solenoid electrical connector.
  10.  
  11. Install the positive battery cable. to the starter. Tighten to 89 inch lbs.. (10 Nm).
  12.  
  13. Connect the negative battery cable.
  14.  

 
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