Envoy, Rainer, Trailblazer 2006-2007

Starter

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Removal & Installation



4.2L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the left front tire and wheel assembly.
  8.  
  9. Working in the left fender area, disconnect the positive battery lead from the solenoid.
  10.  
  11. Remove or disconnect the following:

    Starter mount bolt and nut
     
    Starter motor

    Click image to see an enlarged view

    Fig. Starter mounting-4.2L engine

     

  12.  

To install:

  1. Install or connect the following:

    Starter motor
     
    Starter mounting bolt and nut. Tighten to 37 ft. lbs. (50 Nm).
     
    Positive battery cable to the starter. Tighten the nut to 80 inch lbs. (9 Nm).
     
    Left front tire and wheel assembly
     

  2.  
  3. Carefully lower the vehicle, then connect the negative battery cable.
  4.  

5.3L & 6.0L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Catalytic converter
     
    Engine shield bolts and shield
     
    Right transmission cover bolt
     
    Starter bolts
     
    Transmission cover and shield, after repositioning the starter
     

  4.  
  5. Position the starter down, with the terminals facing toward the front of the vehicle.

    Starter solenoid nut
     
    Starter lead from the solenoid stud
     
    Starter lead nut
     
    Positive cable from the starter stud
     
    Starter

    Click image to see an enlarged view

    Fig. View of the starter, positive cable (1) and starter lead nut (2)-5.3L and 6.0L engines

     

  6.  

To install:

  1. Install or connect the following:

    Starter in the vehicle. Position the starter down , with the terminals facing toward the front of the vehicle.
     
    Positive cable to the starter stud.
     
    Starter lead nut and tighten to 80 inch lbs. (9 Nm)
     
    Starter solenoid lead to the stud
     
    Starter solenoid nut and tighten to 30 inch lbs. (3.4 Nm)
     
    Install the shield and transmission cover, after repositioning the starter
     

  2.  
  3. Slide the starter rearward.

    Starter bolts and tighten to 37 ft. lbs. (50 Nm)
     
    Right transmission cover bolt and tighten to 80 inch lbs. (9 Nm)
     
    Catalytic converter
     
    Negative battery cable
     

  4.  
  5. Start the vehicle to check for proper operation.
  6.  

Testing & Troubleshooting



Before removing the starter for repair or replacement, check the condition of all circuit wiring for damage. Inspect all connection to the starter motor, solenoid, ignition switch, and battery, including all ground connections. Clean and tighten all connections as required.

Check all switches to determine their condition. Vehicles equipped with automatic transmissions have a manual interlock in the steering column which does not allow the ignition switch to turn to the start position unless the transmission is in the Park or Neutral position.

Check the battery to ensure that it is fully charged. For more information on battery service, please refer to Section 1 of this manual.

Check the battery cables for excessive resistance as follows:


CAUTION
To prevent possible injury from a moving vehicle or operating engine, engage the parking brakes, block the drive wheels, place the manual transmission in Neutral or the automatic transmission in Park, and disconnect the battery feed at the distributor before performing these tests.



Check the voltage drop between the negative battery terminal and the vehicle frame by placing one lead of a voltmeter on the grounded battery post (not the cable clamp) and the other lead on the frame. Turn the ignition key to the START position and note the voltage drop.
 
Check the voltage drop between the positive battery terminal (not the cable clamp) and the starter terminal stud. Turn the ignition key to the START position and note the voltage drop.
 
Check the voltage drop between the starter housing and the frame. Turn the ignition key to the START position and note the voltage drop.
 
If the voltage drop in any of the above is more than 1 volt, there is excessive resistance in the circuit. Clean and retest all cables not within specification. Replace as necessary.
 

No Load Test

Make the test connections as shown in the illustration. Close the switch and compare the rpm, current and voltage readings with the accompanying specification illustration.



Current draw and no load speed within specifications indicates normal condition of the starter motor.
 
Low free speed and high current draw indicates worn bearings, a bent armature shaft, a shorted armature or grounded armature fields
 
Failure to operate with high current draw indicates a direct ground in the terminal or fields, or frozen bearings.
 
Failure to operate with no current draw indicates an open field circuit, open armature coils, broken brush springs, worn brushes or other causes which would prevent good contact between the commutator and the brushes.
 
A low no load speed and low current draw indicates high internal resistance due to poor connections, defective leads or a dirty commutator.
 
High free speed and high current draw usually indicate shorted fields or a shorted armature.

Click image to see an enlarged view

Fig. Proper connections for the starter no-load test



Click image to see an enlarged view

Fig. Starter no load test specifications-28-MT series



Click image to see an enlarged view

Fig. Starter no load test specifications-SD series

 

 
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