Crankshaft Main Bearings - Jeep cherokee 2000 Service Manual

XJ
REMOVAL AND INSTALLATION (Continued)
(3) Inspect the camshaft thrust plate for wear. If
the plate shows excessive wear inspect the camshaft
oil pressure relief holes in the rear cam jounral. The
relief holes must be clean and free of debris.
CAUTION: Make sure outside diameter of number 1
bearing is clean. Make sure that the bearing is
properly installed in the engine block, align the oil
hole in the bearing with the oil gallery in the bear-
ing bore. Failure to do so will cause inadequate oil
supply for the sprockets and timing chain.
(4) Using special tool, install new camshaft bear-
ings.
(5) Lubricate the camshaft with Mopar engine oil
supplement, or equivalent.
(6) Carefully install the camshaft to prevent dam-
age to the camshaft bearings
(7) Position the thrust plate and install the two
retaining screws. Tighten screws to 24 N·m (18 ft.
lbs.).
(8) Install the camshaft
sprocket and timing chain with the timing marks
aligned. Install the sprocket bolt.
(9) Tighten the camshaft sprocket bolt and washer
to 68 N·m (50 ft. lbs.).
(10) To verify correct installation of the timing
chain, turn the crankshaft two full revolutions then
position the camshaft sprocket timing mark as shown
in (Fig. 66).
(11) Install the timing chain cover refer to the pro-
cedure in this section.

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 main bearing cap brace (Fig. 67).
(6) Remove only one main bearing cap and lower
insert at a time (Fig. 68).
(7) Remove the lower insert from the bearing cap.
(8) 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. 69). 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
to remove the bearing insert (Fig. 69). After moving
the insert approximately 25 mm (1 inch), it can be
removed by applying pressure under the tab.
sprocket, crankshaft
Fig. 66 Crankshaft / Camshaft Chain Drive
Installation—Typical
1 – CAMSHAFT SPROCKET
2 – TIMING MARKS
3 – CRANKSHAFT SPROCKET
Fig. 67 Main Bearing Caps and Brace.
1 – BLOCK
2 – MAIN BEARING CAP BRACE
(9) Using the same procedure described above,
remove the remaining bearing inserts one at a time
for inspection.
4.0L ENGINE 9 - 105