GM 12557767
Exhaust Manifold, Passenger Side

Starting to replace the right side Exhaust Manifold requires using steering column lock pin (J 42640) to set the steering column into the lock position. Support the vehicle with raised components and remove the rear Exhaust Manifold pipe together with the air check valve. The engine harness clips must be detached from the steering gear heat shield before the removal of the heat shield bolts results in the heat shield's departure. First unsnap and remove the intermediate shaft seal before you take out the pinch bolt that secures the intermediate shaft while removing it from the steering gear. Lowering the engine frame needs a screw-type jack to support its rear component allowing removal of four engine frame-to-body bolts. The Exhaust Manifold extraction requires removing the heated Oxygen Sensor (HO2S) along with the Exhaust Manifold nuts followed by extracting and discarding the old Exhaust Manifold Gasket. Start by mounting the new Exhaust Manifold Gasket onto the cylinder head studs then install the Exhaust Manifold before securing nuts to 25 n.m (18 lb ft). Coat the ho2s threads with anti-sieze compound (GM P/N 12377953 or equivalent) when installing the sensor while tightening it to 41 n.m (30 lb ft). Place the engine frame correctly into its position and replace the four rearward engine frame-to-body bolts while torquing them to 191 n.m (141 lb ft). Screw-type jacks should be removed while you reconnect the intermediate shaft to the steering gear followed by pinch bolt installation and tightening it to 45 n.m (33 lb ft). The steering gear heat shield and its bolts need to be reinstalled before final tightening at 9 n.m (80 lb in). To finalize the installation conclude by connecting the engine harness clips to the steering gear heat shield followed by installing the air check valve and rear Exhaust Manifold pipe then lowering the vehicle, extracting the steering column lock pin (J 42640) while connecting the engine harness electrical connector to the ho2s and adding the ho2s clip to the air valve hose bracket and securing the connector position assurance (CPA) retainer.

Remove the exhaust manifold heat shield bolts and the heat shield.

Reattach the 2 bolts connecting the exhaust crossover to the left exhaust manifold, tightening them to 18 Nm (13 ft. lbs.).

Begin by removing the oil level indicator and tube.

Tighten the lower exhaust manifold bolts to 20 Nm (15 lb ft).

Insert the upper right exhaust manifold bolt into the manifold at the specified location and place the NEW exhaust manifold gasket over the bolt against the manifold.

Remove the heated oxygen sensor.

Install the steering gear heat shield and its bolts, tightening them to 9 Nm (80 lb in), connect the engine harness clips (3 and 2) to the steering gear heat shield, install the AIR check valve, the rear exhaust manifold pipe, lower the vehicle, remove the J 42640 (Steering Column Lock Pin), reconnect the engine harness electrical connector to the HO2S, install the HO2S clip to the AIR valve hose bracket, and finally, install the CPA retainer.

Position it to the engine frame and install the 3 bolts, tightening them to 6 Nm (53 inch lbs.).

Take out the engine mount and bracket.

Reinstall the oxygen sensor and the front engine mount bracket, lower the vehicle, and install the new gasket to the secondary AIR tube before securing the secondary AIR tube to the exhaust manifold with the 2 nuts, tightening them to 12 Nm (106 inch lbs.).

Install the heated oxygen sensor, raise the engine cradle into position, and install the 4 rearward engine frame-to-body bolts, tightening them to 191 Nm (141 ft. lbs.).

Place a new exhaust manifold gasket onto the cylinder head studs, install the exhaust manifold, and tighten the nuts to 25 N.m (18 lb ft).

Place a new exhaust manifold gasket onto the cylinder head studs, install the exhaust manifold, and tighten the nuts to 25 Nm (18 lb ft).

Support it with a tall screw jack.

Support the rear of the engine frame with a tall screw jack.

Lower the vehicle, install a new gasket to the AIR tube, and attach the two nuts connecting the AIR tube to the exhaust manifold.

Reinstall the oxygen sensor and the front engine mount bracket, then lower the vehicle.

Tighten it to 45 Nm (33 ft. lbs.).

Raise and support the vehicle.

Unsnap and remove the intermediate shaft seal, then remove the intermediate shaft pinch bolt and separate the intermediate shaft from the steering gear.

Reattach the 2 bolts connecting the exhaust crossover to the left exhaust manifold, tightening them to 18 N.m (13 lb ft).

Tighten the exhaust manifold bolts to 20 Nm (15 lb ft).

Disconnect the real-time dampening sensor links.