Camshaft Bearings; Crankshaft Main Bearings - Jeep cherokee 2000 Service Manual

XJ
REMOVAL AND INSTALLATION (Continued)
Fig. 74 Verify Crankshaft—Camshaft Installation
1 – CAMSHAFT SPROCKET
2 – 20 PINS
3 – CRANKSHAFT SPROCKET
4 – TIMING MARKS
Fig. 75 Timing Case Cover Alignment and Seal
Installation Tool 6139
1 – TIMING CASE COVER ALIGNMENT AND SEAL
INSTALLATION TOOL
(120 in. lbs.) torque. Tighten the oil pan-to-cover 5/16
inch bolts to 18 N·m (156 in. lbs.) torque.
(14) Remove the cover alignment tool and install a
replacement oil seal into the cover.
(15) Install the vibration damper on the crank-
shaft.
(16) Lubricate and tighten the damper bolt to 108
N·m (80 ft. lbs.) torque.
(17) If equipped with air conditioning:
(a) Install the A/C compressor serpentine drive
belt idler pulley.
(b) Install the generator.
(c) Install the A/C condenser and receiver/drier
assembly.
(18) Install the serpentine drive belt on the pulleys
and tighten (refer to Group 7, Cooling System for the
specifications and procedures).
(19) Install the radiator. Connect the radiator
hoses and automatic transmission fluid cooler pipes,
if equipped. Fill the cooling system.
(20) Install the fan and shroud.
(21) Connect negative cable to battery.

CAMSHAFT BEARINGS

The camshaft rotates within four steel-shelled,
babbitt-lined bearings that are pressed into the cyl-
inder block and then line reamed. The camshaft
bearing bores and bearing diameters are not the
same size. They are stepped down in 0.254 mm
(0.010 inch) increments from the front bearing (larg-
est) to the rear bearing (smallest). This permits eas-
ier removal and installation of the camshaft. The
camshaft bearings are pressure lubricated.
NOTE: It is not advisable to attempt to replace
camshaft bearings unless special removal and
installation tools are available, such as recom-
mended tool 8544 Camshaft Bushing Remover
Installer.
Camshaft end play is maintained by the load
placed on the camshaft by the oil pump and distrib-
utor drive gear. The helical cut of the gear holds the
camshaft sprocket thrust face against the cylinder
block face.

CRANKSHAFT MAIN BEARINGS

REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove the spark plugs.
(3) Raise the vehicle.
(4) Remove the oil pan and oil pump.
(5) Remove only one main bearing cap and lower
insert at a time (Fig. 76).
(6) Remove the lower insert from the bearing cap.
(7) Remove the upper insert by LOOSENING (DO
NOT REMOVE) all of the other bearing caps. Now
insert a small cotter pin tool in the crankshaft jour-
nal oil hole. Bend the cotter pin as illustrated to fab-
ricate the tool (Fig. 77). With the cotter pin tool in
place, rotate the crankshaft so that the upper bear-
ing insert will rotate in the direction of its locking
tab. Because there is no hole in the No.3 main jour-
nal, use a tongue depressor or similar soft-faced tool
2.5L ENGINE 9 - 47