GM Service Manual Online
For 1990-2009 cars only

Valve Rocker Arm Cover Replacement Left Side

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the battery negative cable.

  2. Object Number: 172995  Size: SH
  3. Remove the PCV tube from the air cleaner outlet duct.
  4. Remove the air cleaner outlet duct from the throttle body assembly. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  5. Remove the PCV valve and the hose assembly.
  6. Disconnect the electrical connector from the engine cooling temperature (ECT) sensor.
  7. Notice: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.

  8. Remove the spark plug wires from the spark plugs.

  9. Object Number: 4041  Size: SH

    Important: Power steering pump bracket removal is not necessary.

  10. Remove the left valve rocker arm cover.
  11. Refer to Valve Rocker Arm Cover Removal .

  12. Clean all sealing surfaces. Refer to Valve Rocker Arm Cover Cleaning and Inspection .

Installation Procedure


    Object Number: 4042  Size: SH
  1. Install the left valve rocker arm cover and bolts. Refer to Valve Rocker Arm Cover Installation .
  2. Connect the electrical connector to the engine cooling temperature (ECT) sensor.
  3. Install the spark plug wires to the spark plugs.
  4. Install the PCV valve and the hose assembly.

  5. Object Number: 172995  Size: SH
  6. Install the air cleaner outlet duct to the throttle body assembly. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  7. Connect the PCV valve tube to the air cleaner outlet duct.
  8. Connect the battery negative cable.

Valve Rocker Arm Cover Replacement Right Side

Removal Procedure

    Caution: Before servicing any electrical component, the ignition and start switch must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

  1. Disconnect the battery negative cable.
  2. Notice: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.

  3. Remove the spark plug wires from the spark plugs.
  4. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  5. Remove the PCV tube from the air cleaner outlet duct.
  6. Remove the air cleaner outlet duct from the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.

  7. Object Number: 176060  Size: SH
  8. Remove the bolt from the oil level indicator tube.
  9. Remove the oil fill tube and the bolt.
  10. Remove the A/C wiring harness from the throttle body assembly.
  11. Remove the purge solenoid valve from the EVAP canister. Refer to EVAP Canister Purge Solenoid Valve Replacement in Engine Controls.
  12. Remove both heater hoses.
  13. Remove the ignition control module. Refer to Ignition Coil and Ignition Coil Module Replacement .

  14. Object Number: 328568  Size: SH
  15. Remove the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Removal .
  16. Clean all sealing surfaces. Refer to Valve Rocker Arm Cover Cleaning and Inspection .

Installation Procedure


    Object Number: 328568  Size: SH
  1. Install the right valve rocker arm cover and the bolts. Refer to Valve Rocker Arm Cover Installation .
  2. Install the ignition control module. Refer to Ignition Coil and Ignition Coil Module Replacement in Engine Electrical.
  3. Install the purge solenoid valve EVAP canister. Refer to EVAP Canister Purge Solenoid Valve Replacement in Engine Controls.
  4. Install the A/C wiring harness to the throttle body assembly.
  5. Install both heater hoses to the engine.
  6. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the oil fill tube and the bolt.
  8. Tighten
    Tighten the oil fill tube bolt to 25 N·m (18 lb ft).


    Object Number: 176060  Size: SH
  9. Install the bolt to the oil level indicator tube.
  10. Tighten
    Tighten the bolt to 12 N·m (106 lb in).

  11. Install the air cleaner outlet duct to the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  12. Install the PCV tube to the air cleaner outlet duct.
  13. Fill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  14. Connect the spark plug wires to the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  15. Connect the battery negative cable.