Removal and Replacement

REMOVAL
1. Disconnect battery negative cable.
2. Remove the battery.
3. Disconnect the IAT sensor electrical connector.
4. Disconnect the following; air intake duct at intake manifold, throttle cables, TPS and IAC from throttle body, air make-up hose at air cleaner housing.
5. Remove the air cleaner housing assembly.
6. Remove the battery tray.
7. Remove the timing belt and camshaft sprocket.
8. Remove the cylinder head cover.
9. Mark rocker arm shaft assemblies so that they are installed in their original positions.
10. Remove rocker arm and shafts assembly.
11. Drain cooling system below heater hose level.
12. Disconnect the ECT sensor electrical connector.
13. Disconnect hoses from heater supply and return tubes.
14. Remove heater tube support bracket bolts at rear of cylinder head.
15. Remove PDC attaching screws and reposition for camshaft removal clearance.
16. Remove camshaft sensor and camshaft target magnet.
17. Carefully remove camshaft from the rear of cylinder head. Reposition heater tubes and PDC for camshaft clearance.
18. Remove the camshaft seal.

CLEANING
Clean camshaft with a suitable solvent.

INSPECTION





1. Inspect camshaft bearing journals for damage and binding (Fig. 23). If journals are binding, check the cylinder head for damage. Also check cylinder head oil holes for clogging.
2. Check the cam lobe and bearing surfaces for abnormal wear and damage. Replace camshaft if defective.

NOTE: If camshaft is replaced due to lobe wear or damage, always replace the rocker arms.

3. Measure the lobe actual wear (unworn area wear zone = actual wear) (Fig. 23) and replace camshaft if out of limit. Standard value is 0.0254 mm (0.001 inch), wear limit is 0.254 mm (0.010 inch).

INSTALLATION
1. Lubricate the camshaft journals with oil.
2. Carefully install the camshaft into the cylinder head. Reposition the PDC and heater tubes for clearance.
3. Install camshaft target magnet into the end of the camshaft. Tighten mounting screw to 3.4 Nm (30 in. lbs.).
4. Install camshaft position sensor.
5. Measure camshaft end-play.

NOTE: Camshaft must be installed before installation of the camshaft seal.

6. Install the front camshaft seal.
7. Install the timing belt rear cover.

CAUTION: Do Not use a impact wrench for tightening the camshaft sprocket bolt. Damage to the camshaft timing pin can result. Use a hand wrench only.

8. Install camshaft sprocket and tighten to 115 Nm (85 ft. lbs.).
9. Install timing belt tensioner and timing belt.





10. Install rocker arm assemblies in correct order as removed. Tighten the rocker arm assemblies in sequence shown in (Fig. 24) to 28 Nm (250 in. lbs.).
11. Install the cylinder head cover.
12. Install ignition coil and spark plug cables. Tighten ignition coil fasteners to 12 Nm (105 in. lbs.).
13. Install the heater tube bracket attaching bolt.
14. Connect the heater hoses to the heater tubes.
15. Connect the ECT electrical connector.
16. Install the PDC attaching screws.
17. Install the battery tray.
18. Install the air cleaner housing assembly.
19. Connect all linkages and connectors to throttle body.
20. Connect the IAT sensor.
21. Install the battery and connect cables.
22. Perform camshaft and crankshaft timing relearn procedure as follows:
- Connect the DRB scan tool to the data link (diagnostic) connector. This connector is located in the passenger compartment; at the lower edge of instrument panel; near the steering column.
- Turn the ignition switch on and access the "miscellaneous" screen.
- Select "re-learn cam/crank" option and follow directions on DRB screen.