Cherokee 2WD L6-4.0L VIN S (1998)
Camshaft: Service and Repair
Camshaft
REMOVAL
WARNING: The Coolant In A Recently Operated Engine Is Hot And Pressurized. Release The Pressure Before Removing The Drain Cock.
Cap And Drain Plugs.
1. Disconnect negative cable from battery.
2. Drain the cooling system. DO NOT waste reusable coolant. If the solution is clean, drain it into a clean container for reuse.
3. Remove the radiator or radiator and condenser, if equipped with A/C.
4. Remove the distributor cap and mark the position of the rotor.
5. Remove the distributor and ignition wires.
6. Remove the engine cylinder head cover.
7. Remove the rocker arms, bridges and pivots.
8. Remove the push rods.
9. Remove the engine cylinder head and gasket.
10. Remove the hydraulic valve tappets from the engine cylinder block.
11. Remove the vibration damper.
12. Remove the timing case cover.
13. Remove the timing chain and sprockets.
14. Remove the front bumper and/or grille, as required.
Fig.44 Camshaft
15. Remove the camshaft.
INSTALLATION
1. Inspect the cam lobes for wear.
2. Inspect the bearing journals for uneven wear pattern or finish.
3. Inspect the bearings for wear.
4. Inspect the distributor drive gear for wear.
5. If the camshaft appears to have been rubbing against the timing case cover, examine the oil pressure relief holes in the rear cam journal. The oil
pressure relief holes must be free of debris.
6. Lubricate the camshaft with Mopar Engine Oil Supplement, or equivalent.
7. Carefully install the camshaft to prevent damage to the camshaft bearings.
8. Install the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks aligned.
9. Install the camshaft sprocket retaining preload bolt. Tighten the bolt to 108 Nm (80 ft. lbs.) torque.
10. Lubricate the tension spring, the thrust pin and the pin bore in the preload bolt with Mopar Engine Oil Supplement, or equivalent. Install the spring
and thrust pin in the preload bolt head.
11. Install the timing case cover with a replacement oil seal.
