GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 S/T Isuzu - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Valve Rocker Arm Cover Replacement

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. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.

    3. Object Number: 172995 Size: SH
  3. Remove the PCV valve hose assembly from the valve rocker arm cover.
  4. Disconnect the engine coolant temperature (ECT) sensor.
  5. Partially drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  6. Remove the radiator inlet hose from the water outlet. Refer to Radiator Hose Replacement in Engine Cooling.

    7. Object Number: 172982 Size: SH
  7. Remove the exhaust gas recirculation (EGR) valve inlet pipe from the intake manifold and the exhaust manifold.

    8. Object Number: 4041 Size: SH

    Important: A/C compressor and bracket removal is not necessary.

  8. Remove the bolts and the valve rocker arm cover.
  9. Clean all sealing surfaces. Refer to Valve Rocker Arm Cover Clean and Inspect .

Installation Procedure

    Object Number: 4042 Size: SH
  1. Install the valve rocker arm cover and bolts. Refer to Valve Rocker Arm Cover Installation .

    2. Object Number: 172982 Size: SH

    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.

  2. Install the exhaust gas recirculation (EGR) valve inlet pipe into the intake and exhaust manifolds.

    3. 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 to 25 N·m (18 lb ft).

    Object Number: 172995 Size: SH
  3. Install the radiator inlet hose to the water outlet. Refer to Radiator Hose Replacement in Engine Cooling.
  4. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  5. Install the PCV valve hose assembly to the valve rocker arm cover.
  6. Connect the ECT sensor.
  7. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
  8. 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 EVAP Canister Purge Solenoid Valve Replacement in Engine Controls.
  4. Unfasten the heater hose retainer above the valve rocker arm cover.
  5. Move and secure the heater hoses aside.

    6. Object Number: 340790 Size: SH
  6. Remove the bolt holding the engine wiring harness bracket to the generator.
  7. Disconnect the crankcase position (CKP) sensor electrical connector.
  8. Move and secure the engine wiring harness aside.

    9. Object Number: 328568 Size: SH
  9. Remove the bolts and the right valve rocker arm cover.
  10. Clean all sealing surfaces. Refer to Valve Rocker Arm Cover Clean and Inspect .

Installation Procedure

    Object Number: 328568 Size: SH
  1. Install the right valve rocker arm cover and bolts. Refer to Valve Rocker Arm Cover Installation .

    2. Object Number: 340790 Size: SH
  2. Position the engine wiring harness.
  3. Connect the CKP sensor electrical connector.

    4. 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.

  4. Install the engine wiring harness and bolt to the generator mounting bracket.

    5. Tighten
    Tighten the engine wiring harness bolt to 25 N·m (18 lb ft),

  5. Position the heater hoses.
  6. Install the heater hoses in the retainer above the valve rocker arm cover.
  7. Install the EVAP canister purge solenoid valve. Refer to EVAP Canister Purge Solenoid Valve Replacement in Engine Controls.

    8. Object Number: 172994 Size: SH
  8. 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.
  9. Install the PCV tube to the air cleaner outlet duct and the valve rocker arm cover.