Exhaust Manifold: Service and Repair

Fig. 12 Cross Over Pipe Attaching Volts:

EXHAUST MANIFOLDS - REMOVAL
1. Raise vehicle and disconnect exhaust pipe from rear (cowl side) exhaust manifold at flex-joint. It may be necessary to remove the entire exhaust system. Refer to procedure outlined in this section.
2. Remove bolts attaching cross-over pipe to manifolds. Remove assembly

Fig. 13 Rear Heated Oxygen Sensor:

3. Disconnect Oxygen Sensor lead wire at the rear exhaust manifold.
4. Remove Power Steering pump bracket.
5. Remove nuts attaching rear manifold to cylinder head and remove manifold.

Fig. 14 Front Heated Oxygen Sensor:

6. Lower vehicle and disconnect front heated oxygen sensor. Remove screws attaching front heat shield to front manifold.

INSPECTION
Inspect exhaust manifolds for damage or cracks and check distortion of the cylinder head mounting surface and exhaust crossover mounting surface with a straightedge and thickness gauge.

INSTALLATION
1. Install a new exhaust manifold gasket.
2. Install the rear exhaust manifold and tighten attaching nuts to 20 Nm (175 in lb).
3. Install Power Steering Pump bracket to engine.
4. Attach the flex-joint exhaust manifold and tighten fasteners to 28 Nm (250 in lb).
5. Connect rear heated oxygen sensor lead.
6. Attach crossover pipe to exhaust manifold and tighten bolt to 69 Nm (51 ft lb).
7. Install front exhaust manifold and attach exhaust crossover.
8. Install front manifold heat shield and tighten attaching screws to 15 Nm (130 in lb).