Exhaust Manifold Replacement - Left Side LH6/LS2
Removal Procedure
- Raise and suitably support the vehicle. Refer to
Lifting and Jacking the Vehicle.
- Remove the catalytic converter to exhaust manifold nuts (2).
- Lower the vehicle.
- Remove the spark plugs. Refer to
Spark Plug Replacement.
- Remove the exhaust manifold bolts.
- Remove the exhaust manifold.
- Remove and discard the exhaust manifold gasket.
- Remove the exhaust manifold heat shield bolts (604) and shield (603), if required.
Installation Procedure
Note:
• | 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 3 threads of the bolt. |
Caution: Refer to Fastener Caution in the Preface section.
- Position the exhaust manifold heat shield (603) onto the manifold and install the bolts (604), if required.
Tighten
Tighten the bolts to 9 N·m (80 lb in).
- Apply a 5 mm (0.2 in) wide band of threadlock to the threads of the exhaust manifold bolts. Refer to
Adhesives, Fluids, Lubricants, and Sealers.
- Position a NEW exhaust manifold gasket to the cylinder head.
- Position the exhaust manifold to the cylinder head and install the studs to the catalytic converter.
- Install the exhaust manifold bolts.
Tighten
- Tighten the bolts a first pass to 15 N·m (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
- Tighten the bolts a final pass to 20 N·m (15 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
- Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
- Install the spark plugs. Refer to
Spark Plug Replacement.
- Raise and suitably support the vehicle.
- Install the catalytic converter to exhaust manifold nuts.
Tighten
Tighten the nuts to 50 N·m (37 lb ft).
- Lower the vehicle.