For 1990-2009 cars only
Cleaning Procedure
- Clean the camshaft covers in solvent.
- Dry the camshaft covers with compressed air.
Caution: Refer to Safety Glasses Caution in the Preface section.
Inspection Procedure
- Inspect each camshaft cover for the dents or damage to the exterior. A dented or damaged camshaft cover may:
- Inspect the exterior of the left camshaft cover for the following conditions:
- Inspect the interior of the left camshaft cover for the following conditions:
- Inspect the exterior of the right camshaft cover for the following conditions:
- Inspect the interior of the right camshaft cover for the following conditions:
- Repair or replace the camshaft cover or covers as necessary.
| • | Leak engine oil |
| • | Effect crankcase ventilation |
| • | Interfere with the camshafts |
| • | Interfere with the ignition coil sealing |
| • | Allow water or condensation to enter the engine |
| • | Damage to the camshaft cover bolt holes (1) |
| • | Damage to the oil fill hole (2) |
| • | Damage to the mounting holes (3) for the ignition coil assembly |
| • | Damage to the positive crankcase ventilation (PCV) hose connector (4)--A damaged PCV hose connector is replaceable. |
| • | Gouges or damage to the camshaft cover sealing groove (1) |
| • | Damaged, loose or missing baffle fasteners (2) |
| • | Damaged, loose or missing baffle (3) |
| • | Gouges or damage to the ignition coil seal bore (4) |
| • | Restrictions to the ventilation system (5) |
| • | Damage to the camshaft cover bolt holes (1) |
| • | Damage to the mounting holes (2) for the ignition coil assembly |
| • | Damage to the PCV orifice (3)--A damaged PCV orifice can be replaced. Refer to PCV Orifice Replacement. |
| • | Gouges or damage to the camshaft cover sealing groove (1) |
| • | Gouges or damage to the ignition coil seal bore (2) |
| • | Restrictions to the ventilation system (3) |
PCV Orifice Replacement
- Remove the old PCV orifice by griping the neck of the orifice with pliers and twisting and pulling out of the right camshaft cover.
- Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent to the NEW PCV orifice (1).
- Install the NEW PCV orifice into the right camshaft cover. After insertion, twist the PCV orifice in order to eliminate any vertical leak paths in the sealant.
Important: If the PCV orifice is damaged or plugged and cannot be cleaned out, the PCV orifice can be replaced.
PCV Fitting Replacement
- Remove the old PCV fitting.
- Install the new PCV fitting with a NEW O-ring.
Important: If the PCV fitting is damaged or plugged and cannot be cleaned out, the PCV fitting can be replaced.
