Jeep Cherokee (XJ): Hydraulic tappets. Vibration damper. Timing case cover oil seal
REMOVAL Retain all the components in the same order as
removed.
(1) Remove the engine cylinder head cover (refer to
procedure earlier in this section)
(2) Remove the bridge and pivot assemblies and
rocker arms by removing the capscrews at each
bridge. Alternately loosen each capscrew, one turn at
a time, to avoid damaging the bridges.
(3) Remove the push rods.
(4) Remove the tappets through the push rod openings
in the cylinder head with a Hydraulic Valve
Tappet Removal/Installation Tool (Fig. 60).
1 - HYDRAULIC VALVE TAPPET REMOVAL/INSTALLATION TOOL INSTALLATION It is not necessary to charge the tappets with
engine oil. They will charge themselves within a very
short period of engine operation.
(1) Dip each tappet in Mopar Engine Oil Supplement,
or equivalent.
(2) Use Hydraulic Valve Tappet Removal/Installation
Tool to install each tappet in the same bore from
where it was originally removed.
(3) Install the push rods in their original locations.
(4) Install the rocker arms and bridge and pivot
assemblies at their original locations. Loosely install
the capscrews at each bridge.
(5) Tighten the capscrews alternately, one turn at
a time, to avoid damaging the bridges. Tighten the
capscrews to 28 N·m (21 ft. lbs.) torque.
(6) Install the engine cylinder head cover. REMOVAL (1) Disconnect negative cable from battery.
(2) Remove the serpentine drive belt and fan
shroud.
(3) Remove the vibration damper retaining bolt
and washer.
(4) Use Vibration Damper Removal Tool 7697 to
remove the damper from the crankshaft (Fig. 61). INSTALLATION (1) Apply Mopar Silicone Rubber Adhesive Sealant
to the keyway in the crankshaft and insert the key
1 - VIBRATION DAMPER REMOVAL TOOL With the key in position, align the keyway on the
vibration damper hub with the crankshaft key and
tap the damper onto the crankshaft.
(2) Install the vibration damper retaining bolt and
washer.
(3) Tighten the damper retaining bolt to 108 N·m
(80 ft. lbs.) torque.
(4) Install the serpentine drive belt and tighten to
the specified tension (refer to Group 7, Cooling Systems
for the proper specifications and procedures).
(5) Connect negative cable to battery. REMOVAL This procedure is done with the timing case cover
installed.
(1) Disconnect negative cable from battery.
(2) Remove the serpentine drive belt.
(3) Remove the vibration damper.
(4) Remove the radiator shroud.
(5) Carefully remove the oil seal. Make sure seal
bore is clean. INSTALLATION (1) Position the replacement oil seal on Timing
Case Cover Alignment and Seal Installation Tool
6139 with seal open end facing inward. Apply a light
film of Perfect Seal, or equivalent, on the outside
diameter of the seal. Lightly coat the crankshaft with
engine oil.
(2) Position the tool and seal over the end of the
crankshaft and insert a draw screw tool into Seal
Installation Tool 6139 (Fig. 62). Tighten the nut
against the tool until it contacts the cover.
1 - SEAL INSTALLATION TOOL (3) Remove the tools. Apply a light film of engine
oil on the vibration damper hub contact surface of
the seal.
(4) Apply Mopar Silicone Rubber Adhesive Sealant
to the keyway in the crankshaft and insert the key.
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.
(5) Install the serpentine belt and tighten to the
specified tension (refer to Group 7, Cooling Systems
for the proper specifications and procedures).
(6) Install the radiator shroud.
(7) Connect negative cable to battery.Hydraulic tappets
Fig. 60 Hydraulic Valve Tappet Removal/Installation ToolVibration damper
Fig. 61 Vibration Damper Removal Tool 7697
2 - WRENCHTiming case cover oil seal
Fig. 62 Timing Case Cover Oil Seal Installation
2 - DRAW SCREW TOOL
Valve spring and seal. Cylinder head. Cylinder head
Timing case cover. Timing chain and sprockets. Camshaft
Other materials:
Emission system. Malfunction indicator lamp (mil). State display test mode
Emission system
OPERATION
The Powertrain Control Module (PCM) monitors
many different circuits in the fuel injection, ignition,
emission and engine systems. If the PCM senses a
problem with a monitored circuit often enough to
indicate an actual problem, it stores a Diagnostic
Trouble Code (DTC ...