GM Service Manual Online
For 1990-2009 cars only

Valve Rocker Arm Cover Replacement Left

Removal Procedure

  1. Remove the air cleaner outlet duct from the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  2. Partially drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Remove the radiator inlet hose from the water outlet. Refer to Radiator Hose Replacement in Engine Cooling.

  4. Object Number: 172995  Size: SH
  5. Remove the PCV valve hose assembly from the valve rocker arm cover.

  6. Object Number: 246797  Size: SH
  7. Disconnect the engine coolant temperature (ECT) sensor electrical connector.

  8. Object Number: 172982  Size: SH
  9. Remove the spark plug wire harness retainer from the exhaust gas recirculation (EGR) valve inlet pipe.
  10. Remove the clamp bolt for the EGR valve inlet pipe.
  11. Remove the EGR valve inlet pipe from the intake and the exhaust manifolds.
  12. Important: A/C compressor and bracket removal is not necessary.

  13. Remove the valve rocker arm cover. Refer to Valve Rocker Arm Cover Removal .
  14. Clean all sealing surfaces and the valve rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection .

Installation Procedure

  1. Install the valve rocker arm cover. Refer to Valve Rocker Arm Cover Installation .

  2. Object Number: 172982  Size: SH
  3. Install the EGR valve inlet pipe to the intake manifold and the exhaust manifold.
  4. Tighten

    1. Tighten the EGR valve inlet pipe intake manifold nut to 25 N·m (18 lb ft).
    2. Tighten the EGR valve inlet pipe exhaust manifold nut to 30 N·m (22 lb ft).
    3. Tighten the EGR valve inlet pipe clamp bolt 25 N·m (18 lb ft).
  5. Install the spark plug wire harness retainer on the EGR valve inlet pipe.

  6. Object Number: 172995  Size: SH
  7. Install the radiator inlet hose to the water outlet. Refer to Radiator Hose Replacement in Engine Cooling.
  8. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  9. Install the PCV valve hose assembly to the valve rocker arm cover.

  10. Object Number: 246797  Size: SH
  11. Connect the ECT sensor electrical connector.
  12. Install the air cleaner outlet duct to the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.

Valve Rocker Arm Cover Replacement Right

Removal Procedure


    Object Number: 172994  Size: SH
  1. Remove the PCV tube from the air cleaner outlet duct and the valve rocker arm cover.
  2. Disconnect the spark plug wires from the spark plugs for the right side of the engine. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  3. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement in Engine Controls.

  4. Object Number: 531473  Size: SH
  5. Unfasten the heater hose retainer above the valve rocker arm cover.
  6. Move and secure the heater hoses aside.

  7. Object Number: 517077  Size: SH
  8. Remove the bolt (3) holding the engine wiring harness bracket to the generator.
  9. Disconnect the crankcase position (CKP) sensor electrical connector (2).
  10. Move and secure the engine wiring harness aside.
  11. Remove the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Removal .
  12. Clean all sealing surfaces and the valve rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection .

Installation Procedure

  1. Install the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Installation .

  2. Object Number: 517077  Size: SH
  3. Position the engine wiring harness.
  4. Connect the CKP sensor electrical connector (2).
  5. 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.

  6. Install the engine wiring harness and the bolt (3) to the generator mounting bracket.
  7. Tighten
    Tighten the engine wiring harness bolt to 25 N·m (18 lb ft),


    Object Number: 531473  Size: SH
  8. Position the heater hoses.
  9. Install the heater hoses in the retainer above the valve rocker arm cover.
  10. Install the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement in Engine Controls.

  11. Object Number: 172994  Size: SH
  12. Connect the spark plug wires to the spark plugs for the right side of the engine. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  13. Install the PCV tube to the air cleaner outlet duct and the valve rocker arm cover.