Jeep Cherokee 2000 Service Manual - page 793
(10) Installation of the timing chain with the tim-
ing marks on the crankshaft and camshaft sprockets
properly aligned ensures correct valve timing. A worn
or stretched timing chain will adversely affect valve
timing. If the timing chain deflects more than 12.7
mm (1/2 inch) replace it.
INSTALLATION
Assemble the timing chain, crankshaft sprocket
and
camshaft
sprocket
with
the
timing
marks
aligned (Fig. 61).
(1) Apply Mopar Silicone Rubber Adhesive Sealant
to the keyway in the crankshaft and insert the key.
With the key in the keyway on the crankshaft, install
the assembly on the crankshaft and camshaft.
(2) Install the camshaft sprocket bolt and washer
(Fig. 62). Tighten the bolt to 68 N·m (50 ft. lbs.)
torque.
(3) To verify correct installation of the timing
chain, rotate the crankshaft 2 revolutions. The cam-
shaft and crankshaft sprocket timing mark should
align (Fig. 61).
(4) Install the crankshaft oil slinger.
(5) Replace the oil seal in the timing case cover.
(6) Install the timing case cover and gasket.
(7) With the key installed in the crankshaft key-
way, install the vibration damper, washer and bolt.
Lubricate and tighten the bolt to 108 N·m (80 ft. lbs.)
torque.
(8) Install the serpentine drive belt. (refer to
Group 7, Cooling System for the proper procedure).
(9) Install the fan and hub assembly. Install the
shroud.
(10) Connect negative cable to battery.
CAMSHAFT
REMOVAL
WARNING: THE COOLANT IN A RECENTLY OPER-
ATED
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 reus-
able 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 (refer to Group 7, Cooling Sys-
tem for the proper procedure).
(4) Remove the engine cylinder head cover.
(5) Remove the rocker arms, bridges and pivots.
(6) Remove the push rods.
(7) Remove the engine cylinder head and gasket.
(8) Remove the hydraulic valve tappets from the
engine cylinder block.
(9) Remove the vibration damper.
(10) Remove the timing case cover.
(11) Rotate the crankshaft until the crankshaft
sprocket timing mark is aligned on centerline with
the camshaft sprocket timing mark (Fig. 64).
(12) Remove the timing chain and sprockets.
(13) Remove the front bumper and/or grille, as
required.
(14) Remove the two thrust plate retaining screws,
thrust plate and camshaft (Fig. 63).
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 thrust washer, 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 dam-
age to the camshaft bearings (Fig. 63).
(8) Position thrust plate and install retaining
screws. Tighten screws to 24 N·m (18 ft. lbs.).
(9) Install the timing chain, crankshaft sprocket
and
camshaft
sprocket
with
the
timing
marks
aligned.
(10) Install the camshaft sprocket bolt/cup washer.
Tighten the bolt to 68 N·m (50 ft. lbs.).
Fig. 63 Camshaft
1 – CAMSHAFT
2 – CRANKSHAFT
XJ
4.0L ENGINE
9 - 103
REMOVAL AND INSTALLATION (Continued)