Removal Procedure
- Remove the AIR crossover pipe, if equipped.
- Remove the secondary air injection (AIR) pipe assembly from the exhaust manifold, if equipped. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1 in Engine Controls - 4.3L.
- Remove the nuts and the engine wiring harness bracket from the upper intake manifold studs.
- Remove the bolt holding the engine wiring harness clip to the positive battery cable junction block bracket.
- Disconnect the engine coolant temperature (ECT) sensor electrical connector.
- Move and secure the engine wiring harness with the engine wiring harness bracket aside.
- Disconnect the power brake booster vacuum hose from the intake manifold and the vacuum brake booster.
- Remove the PCV valve hose assembly from the intake manifold and the valve rocker arm cover.
- Remove the valve rocker arm cover bolts.
- Remove the valve rocker arm cover bolt grommets.
- Discard the valve rocker arm cover bolt grommets.
- Remove the valve rocker arm cover.
- Remove the valve rocker arm cover gasket.
- Discard the valve rocker arm cover gasket.
- Clean the valve rocker arm cover in cleaning solvent.
- Dry the valve rocker arm cover with compressed air.
- Inspect the valve rocker arm cover for the following:
Caution: Wear safety glasses in order to avoid eye damage.
| • | Damage to the PCV valve grommet (1) |
| • | Damage to the bolt holes (2) |
| • | A damaged valve rocker arm cover may interfere with the valve rocker arms. |
| • | Damage to the exterior of the valve rocker arm cover (3) |
| • | Gouges or damage to the sealing surface (4) |
| • | Damage to the oil fill tube grommet (5) |
| • | Restrictions to the ventilation system passages |
Installation Procedure
- Install the NEW valve rocker arm cover gasket into the groove of the valve rocker arm cover.
- Install the NEW valve rocker arm cover bolt grommets into the valve rocker arm cover.
- Install the valve rocker arm cover onto the cylinder head.
- Install the valve rocker arm cover bolts.
- Install the PCV valve hose assembly to the intake manifold and the valve rocker arm cover.
- Connect the power brake booster vacuum hose to the intake manifold and the vacuum brake booster.
- Reposition the engine wiring harness.
- Install the engine wiring harness bracket and the nuts to the lower intake manifold studs.
- Install the bolt for the engine wiring harness clip to the positive battery cable junction block bracket.
- Connect the ECT sensor electrical connector.
- Install the AIR pipe assembly to the exhaust manifold, if equipped. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1 in Engine Controls - 4.3L.
- Install the AIR crossover pipe, if equipped.
Important: Do not reuse the valve cover gasket or the valve rocker arm cover bolt grommets.
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.
Tighten
Tighten the valve rocker arm cover bolts to 12 N·m (106 lb in).
Tighten
Tighten the engine wiring harness bracket nuts to 12 N·m
(106 lb in).
Tighten
Tighten the engine wiring harness clip nut to 9 N·m (80 lb in).
