Removal and Replacement
REMOVAL1. Disconnect and isolate negative battery cable.
2. Disconnect positive battery cable. Remove the battery.
3. Disconnect the IAT sensor electrical connector.
4. Disconnect the following:
^ Air intake duct at throttle body
^ Throttle cables
^ TPS and IAC connectors
^ Make-up air hose at air cleaner housing
5. Remove the air cleaner housing assembly.
6. Remove the battery tray.
7. Remove the front timing belt cover, timing belt, and tensioner.
8. Remove the camshaft sprocket and rear timing belt cover.
9. Remove the cylinder head cover.
10. Mark rocker arm shaft assemblies so that they are installed in their original positions.
11. Remove rocker arm and shaft assemblies.
12. Drain cooling system below heater hose level.
13. Disconnect the ECT sensor electrical connector.
14. Disconnect hoses from heater supply and return tubes.
15. Remove heater tube support bracket bolts at rear of cylinder head.
16. Remove PDC attaching screws and reposition for camshaft removal clearance.
17. Remove camshaft sensor and camshaft target magnet.
18. Carefully remove camshaft from the rear of cylinder head. Reposition heater tubes and PDC for camshaft clearance (Fig. 30).
19. Remove the camshaft seal.
CLEANING
Clean camshaft with a suitable solvent.
INSPECTION
1. Inspect camshaft bearing journals for damage and binding (Fig. 31). 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. 31) 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 (Fig. 30).
3. Install camshaft target magnet into the end of the camshaft. Tighten mounting screw to 3.4 Nm (30 inch lbs.).
4. Install camshaft position sensor.
5. Measure camshaft end-play.
NOTE: Camshaft must be installed before installation of the camshaft seal.
6. Install camshaft seal.
7. Install rear timing belt cover.
8. Install the camshaft sprocket on the camshaft.
CAUTION: DO NOT use an impact wrench (or any other air operated tool) for tightening the camshaft sprocket bolt. Damage to the camshaft timing pin can result. ONLY use a hand wrench while holding camshaft sprocket with Special Tool.
9. Install camshaft sprocket retaining bolt. While holding sprocket with Special Tools C-4687 and modified Adaptor C-4687-1, tighten attaching bolt to 115 Nm (85 ft. lbs.).
10. Install timing belt and tensioner/bracket assembly.
11. Install front timing belt cover.
12. Install rocker arm and shaft assemblies in correct order as removed.
13. Install the cylinder head cover.
14. Install ignition coil and spark plug cables. Tighten ignition coil fasteners to 12 Nm (105 inch lbs.).
15. Install the heater tube bracket attaching bolt.
16. Connect the heater hoses to the heater tubes.
17. Connect the ECT electrical connector.
18. Install the PDC attaching screws.
19. Install the battery tray.
20. Install the air cleaner housing assembly.
21. Connect the following:
^ Air intake duct at throttle body