GM 12600526
Exhaust Manifold, Driver Side

Raising and supporting the vehicle enables the replacement of the left Exhaust Manifold after removing Exhaust Manifold pipe nuts. After lowering the vehicle start the spark plugs removal. You should unscrew three bolts and detach the heat shield from the Exhaust Manifold to remove it. You must remove Exhaust Manifold bolts before taking out the manifold and its gasket; discard the old gasket. The Exhaust Manifold requires a complete inspection after cleaning all surfaces. To install the bolts you must first use gm p/n 12345493 (Canadian P/N 10953488) threadlock or an equivalent material on a 5 mm (0.2 inch) wide band that runs along the bolt threads. This procedure requires a clean bolt hole area with no debris or threadlocking residue as well as missing sealant from the first three threads of each bolt. Install the Exhaust Manifold using new gasket and bolts and start by tightening the center two bolts to 25 nm (18 ft.lbs.) and continue by alternately tightening between the side bolts to the outside bolts before a final tightening pass to the same torque specification. A flat punch should bend the Exhaust Manifold Gasket edge at the left Cylinder Head rear where it is exposed before installing both the heat shield and its bolts. Tighten these bolts to 9 nm (80 inch lbs.). Raise the car once more then put the Exhaust Manifold pipe nuts and torque them to 50 nm (37 ft. Lbs.) before finally lowering it.

Remove the exhaust manifold bolts, manifold, and gasket, discarding the old gasket.

Loosen and remove the exhaust pipe bolts from the exhaust manifold, then lower the vehicle.

Tighten the nuts to 50 Nm (37 ft. lbs.) before lowering the vehicle.

Clean and inspect the exhaust manifold, ensuring the cylinder head exhaust manifold bolt hole threads are clean and free of debris or thread locking material.

Remove the exhaust manifold pipe nuts.

Detach the heat shield bolts and shield from the exhaust manifold.

Reinstall the spark plugs, raise and support the vehicle again, and install the catalytic converter to exhaust manifold nuts, tightening them to 50 N.m (37 lb ft) before lowering the vehicle.

Install the exhaust manifold bolts.

Install the manifold heat shield, raise the vehicle again, and connect the exhaust pipe to the manifold with a seal, securing it with nuts tightened to 50 Nm (37 ft. lbs.).

Secure it with nuts tightened to 50 Nm (37 ft. lbs.), and finally lower the vehicle.

Install the two catalytic converter to exhaust manifold nuts, tightening them to 50 Nm (37 lb ft).