GM 12592083
Exhaust Manifold, Passenger Side

The fundamental requirement for right side Exhaust Manifold replacement applies to all 4.8l, 5.3l, 6.0l, and 6.2l engines where the technician must remove the heated Oxygen Sensor (HO2S). Fully support the elevated vehicle before removing the nuts which secure the Catalytic Converter to the Exhaust Manifold while recognizing that the 1500 series esv model serves as an example since the 2500 series shares similar characteristics. Put the wheelhouse liner and Spark Plug Wires into a position where the boot should twist by half a turn before pulling the boot by itself. The engine block requires you to remove its oil level indicator tube bolt (419) along with the tube (420). Evacuate the Exhaust Manifold bolts before extracting the Exhaust Manifold while throwing out the Exhaust Manifold Gasket and seal. Lead removal requires operators to unfasten both the Exhaust Manifold heat shield bolts and to take away the heat shield. During installation position the Exhaust Manifold heat shield before mounting it with bolts which should be tightened to 9 nm (80 lb in). All Exhaust Manifold bolts require cleaning followed by the application of thread-lock gm p/n 12345493 (Canadian P/N 10953488) that covers the threads by 5 mm (0.2 in). Place the new Exhaust Manifold Gasket together with the Exhaust Manifold onto the cylinder head. Additionally place the Catalytic Converter seal before seating it properly. Start by tightening the Exhaust Manifold bolts to 15 nm (11 lb ft) following a pattern of center bolts first and then alternating side-to-side before reaching the final torque of 20 nm (15 lb ft) while also maintaining the same pattern. Using a flat punch bend the gasket tab which extends from its rear section around the cylinder head edge. The o-ring seal (421) should receive an inspection for damage before getting lubricated with engine oil. After that put in the oil level indicator tube (420) to the engine block while tightening the bolt (419) to 25 nm (18 lb ft). The Spark Plug Wires should be replaced on the spark plugs and ignition coils after installation through each boot by pushing in a sideways motion. After installing the correct wheelhouse liner, securely raise the vehicle once again before installing the Catalytic Converter to Exhaust Manifold nuts which you will tighten to 50 nm (37 lb ft). The installation process ends with partially lowering the vehicle towards the wheel opening for inserting the ho2s.

Install the manifold studs to the catalytic converter.

Install the manifold studs to the catalytic converter.

Tighten them to 9 Nm (80 lb in).

First, raise and support the vehicle.

Raise and support the vehicle, then install the catalytic converter to exhaust manifold nuts, tightening them to 50 N.m (37 lb ft) before lowering the vehicle.

Remove the exhaust manifold bolts and stud, then take out the exhaust manifold and gaskets, discarding the gaskets.

Clean the threads of the exhaust manifold bolts and apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493.