Jeep Wrangler 1997 Manual page 734

9- 72 4.OL ENGINE
REMOVAL AND INSTALLATION (Continued)
Lubricate and tighten the bolt to 108 N-m (80 ft. lbs.)
torque .
(10) Install the A/C compressor (if equipped) and
generator bracket assembly.
(11) Install the engine fan and hub assembly and
shroud .
(12) Install the serpentine drive belt and tighten
to obtain the specified tension .
(13) Connect negative cable to battery.
TIMING CHAIN AND SPROCKETS
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. 32).
CAMSHAFT
SPROCKET
J9009-61
Fig. 32 Crankshaft-Camshaft Alignment-Typical
(7)
Remove the oil slinger from the crankshaft .
(8) Remove the tension spring and thrust pin from
the preload bolt (Fig. 33). Remove the camshaft
sprocket retaining preload bolt and washer .
(9) Remove the crankshaft sprocket, camshaft
sprocket and timing chain as an assembly.
(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. The correct timing chain
has 48 pins . A chain with more than 48 pins will
cause excessive slack.
CAMSHAFT WASHER TENSION
SPROCKET
I
SPRING
CAMSHAFT
REMOVAL
THRUST
PIN
PRELOAD
BOLT
J9109-177
Fig. 33 Camshaft Sprocket Preload Bolt
TJ
INSTALLATION
Assemble the timing chain, crankshaft sprocket
and camshaft sprocket with the timing marks
aligned (Fig . 32).
(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 retaining preload
bolt and washer (Fig. 33). Tighten the preload bolt to
108 N-m (80 ft. lbs.) torque .
(3) Install the crankshaft oil slinger.
(4) Replace the oil seal in the timing case cover.
(5) Lubricate the tension spring, thrust pin and
pin bore in the preload bolt with Mopar Engine Oil
Supplement, or equivalent . Install the spring and
thrust pin in the preload bolt head (Fig. 33).
(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 and tighten to
the specified tension (refer to Group 7, Cooling Sys-
tem for the proper procedure).
(9) Install the fan and hub assembly. Install the
shroud .
(10) Connect negative cable to battery.
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 .