Exhaust Manifold Replacement - Left Side
Exhaust Manifold Replacement - Left Side
Removal Procedure
1. Raise and suitably support the vehicle.
2. Remove the exhaust manifold pipe nuts.
3. Lower the vehicle.
4. Remove the spark plug wires.
5. Remove the exhaust manifold bolts, manifold, and gasket.
6. Discard the gasket.
7. Remove the heat shield bolts (3), and shield (2) from the exhaust manifold (1), if necessary.
8. Clean and inspect the exhaust manifold, if the manifold is not being replaced.
Installation Procedure
Notice: Refer to Fastener Notice.
1. Install the heat shield (2), and bolts (3) to the exhaust manifold (1), if necessary.
Tighten the bolts to 9 N.m (80 lb in).
Important:
^ Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
^ The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
^ Do not apply sealant to the first three threads of the bolt.
Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 101953488) or equivalent to the threads of the exhaust manifold bolts.
2. Install the exhaust manifold, NEW gasket and bolts.
1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
2. Tighten the exhaust manifold bolts a final pass to 25 N.m (18 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
3. Install the spark plug wires.
4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
5. Raise the vehicle.
6. Install the exhaust manifold pipe nuts.
Tighten the nuts to 50 N.m (37 lb ft).
7. Lower the vehicle.
8. Install the ignition coils.