Although in most cases the engine does not have exhaust manifold gasket installed by the factory, aftermarket gaskets are usually available from automotive parts stores. For 6 cylinder models, refer to the combination manifold procedure.
REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Disconnect the negative battery cable.
- If removing the right side exhaust manifold, remove the air cleaner and mounting hardware, as well as the heat stove, if equipped.
- On 5.8L and 6.6L engines: if the left exhaust manifold is being removed, first drain the engine oil and remove the oil filter. On 4.2L and 5.0L engines, the dipstick and tube removal may be required. Remove any speed control brackets that interfere.
- Disconnect the exhaust pipes from the manifolds.
On certain vehicles with automatic transmission and column shift, it may be necessary to disconnect the selector lever crossshaft for clearance.
- Disconnect the spark plug wires and remove the spark plugs and heat shields. Disconnect the EGR sensor (models so equipped), and heat control valve vacuum line (models so equipped).
On some engines the spark plug wire heat shields are removed with the manifold. Transmission dipstick tube and Thermactor® air tube removal may be required on certain models. Air tube removal is possible by cutting the tube clamp at the converter.
- Remove the exhaust manifold attaching bolts and washers, and remove the manifold(s).
- Inspect the manifold(s) for damaged gasket surfaces, cracks, or other defects.
- Clean the mating surfaces of the manifold(s), cylinder head and muffler inlet pipe(s).
- Install the manifold(s) in the reverse order of removal. Tighten the mounting bolts evenly (in steps) to the value listed in the Torque Specifications chart in this section. Start with the centermost bolt and work outward in both directions.