Exhaust manifold — removal and installation
Warning: The engine must be completely cool before beginning this procedure.
Removal
1. Disconnect the cable from the negativebattery terminal (see Engine electrical systems).
2. Raise the front of the vehicle and support it securely on jack stands. Working below the vehicle, remove the lower splash shields.
3. Apply penetrating oil to the bolts andsprings retaining the exhaust pipe to the manifold. After the bolts have soaked, remove the bolts retaining the exhaust pipe to the manifold. Separate the front exhaust pipe from the manifold, being careful not to damage the oxygen sensor (see illustration).
i. 3 Working below the vehicle, remove the exhaust pipe-to-manifold mounting bolts (A) and lower the front exhaust pipe. Be careful notto damage the oxygen sensors (C) — (B) indicates the mounting bolts for the exhaust manifold lower brace
4. Unbolt the lower exhaust manifold bracesand remove them from the engine. Also, disconnect the oxygen sensor connectors.
5. Working in the engine compartment, remove the upper heat shield from the manifold (see illustration).
i. 5 Working from the engine compartment, remove the upper heat shield mounting bolts.
Note: There is also a lower heat shield, but it is attached to the manifold from underneath and does not need to be removed.
6. Remove the oil dipstick tube mountingbolt and remove the dipstick tube from the crankcase stiffener.
7. Remove the exhaust manifold supportbracket bolt and bracket nut, then remove the support bracket.
8. Remove the nuts and detach the manifold and gasket (see illustration).
i. 8… and the exhaust manifold retaining nuts, then pull the manifold off the studs on the cylinder head nd remove the manifold from above
Installation
9. Use a scraper to remove all traces of oldgasket material and carbon deposits from the manifold and cylinder head mating surfaces. If the gasket shows signs of leaking, check the manifold for warpage with a straight edge. If the manifold is warped it must be replaced.
Note: If the manifold is being replaced with a new one it will be necessary to remove the lower heat shield and fasten it to the new manifold.
10. Position a new gasket over the cylinder head studs, noting any directional marks or arrows on the gasket which may be present.
11. Install the manifold and thread the mounting nuts into place.
12. Working from the center out, tighten the nuts/bolts to the torque listed in this Chapter’s Specifications in three or four equal steps.
13. Reinstall the remaining parts in the reverse order of removal.
14. Run the engine and check for exhaust leaks.