Exhaust Manifold Replacement - Left Side (LS7 or LS9)

Fig 1: View Of Exhaust Manifold & Components

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
CAUTION: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe. Preliminary Procedure Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement (LS9) , Upper Intake Manifold Sight Shield Replacement (w/o LS9) . Remove the spark plugs. Refer to Spark Plug Replacement . Remove the generator. Refer to Generator Replacement (LS3 or LS7) , Generator Replacement (LS9) . Remove the left catalytic converter. Refer to Catalytic Converter Replacement - Left Side (LS3) , Catalytic Converter Replacement - Left Side (LS7) .
1	Exhaust Manifold Bolt (Qty: 6) CAUTION: Refer to Fastener Caution . Procedure Apply a 5 mm (0.2 in) wide band thread of threadlock to the threads of the exhaust manifold bolts. Tighten the bolts starting at in the center, alternating side-to-side, working outward. TIP: The cylinder head bolt hole threads must be cleaned and free of debris or threadlock material. Tighten First Pass: 15 N.m (11 lb ft) Final Pass: 25 N.m (18 lb ft)
2	Exhaust Manifold
3	Exhaust Manifold Gasket TIP: Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
4	Exhaust Manifold Pipe Gasket TIP: Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.