Jeep Cherokee

 Service Manual

Engine » 2.5L engine » Removal and installation
Timing chain and sprockets

The chain drive system ie equipped with a timing chain tensioner which reduces noise and prolongs timing chain life. In addition, it compensates for wear and temperature changes on the valve train for proper engine operation.

REMOVAL

(1) Disconnect negative cable from battery.

(2) Remove the fan and shroud.

(3) Remove the serpentine drive belt.

(4) Remove the crankshaft vibration damper.

(5) Remove the timing case cover.

(6) Rotate crankshaft until the "0" timing mark is closest to and on the center line with camshaft sprocket timing mark (Fig. 65).

(7) Remove the oil slinger from the crankshaft.

(8) Remove the camshaft retaining bolt and remove the sprockets and chain as an assembly (Fig.

66).

(9) To replace the timing chain tensioner, the oil pan must be removed.

INSTALLATION

(1) Turn the tensioner lever to the unlocked (down) position (Fig. 67).

(2) Pull the tensioner block toward the tensioner lever to compress the spring. Hold the block and turn the tensioner lever to the lock position (Fig. 67).

(3) Apply Mopar Silicone Rubber Adhesive Sealant to the keyway in the crankshaft and insert the key.

With the key in the crankshaft keyway, install the crankshaft, camshaft sprockets and timing chain.

Ensure the timing marks on the sprockets are properly aligned (Fig. 65).

Fig. 65 Crankshaft-Camshaft Alignment

1 - TIMING MARKS

Fig. 66 Camshaft and Crankshaft Sprockets and Chain

1 - CAMSHAFT SPROCKET
2 - CRANKSHAFT SPROCKET
3 - CHAIN

(4) Install the camshaft sprocket retaining bolt and washer. Tighten the bolt to 108 N·m (80 ft. lbs.) torque.

(5) To verify correct installation of the timing chain, turn the crankshaft to position the camshaft sprocket timing mark as shown in (Fig. 68). Count the number of chain pins between the timing marks of both sprockets. There must be 20 pins.

(6) Turn the chain tensioner lever to the unlocked (down) position (Fig. 67).

(7) Install the oil slinger.

(8) Replace the oil seal in the timing case cover.

(9) Install the timing case cover and gasket.

Fig. 67 Loading Timing Chain Tensioner

1 - LOCK
2 - UNLOCK
3 - TENSIONER BLOCK
4 - TENSIONER LEVER

Fig. 68 Verify Sprocket-Chain Installation

1 - CAMSHAFT SPROCKET
2 - 20 PINS
3 - CRANKSHAFT SPROCKET
4 - TIMING MARKS

(10) With the key inserted in the keyway in the crankshaft, install the vibration damper, washer and bolt. Lubricate and tighten the bolt to 108 N·m (80 ft.

lbs.) torque.

(11) Install the fan and shroud.

(12) Connect negative cable to battery.

Engine mounts-front

Engine mount-rear

Engine

Intake manifold

Exhaust manifold

Cylinder head cover

Rocker arms and push rods

Valve spring and seal

Cylinder head

Cylinder head

Hydraulic tappets

Vibration damper

Timing case cover oil seal

Timing case cover

Timing chain and sprockets

Camshaft

Camshaft pin replacement

Camshaft bearings

Crankshaft main bearings

Oil pan

Oil pump

Piston and connecting rod

Rear main oil seal