Jeep 1996 Grand Cherokee Service Manual - page 977
the insert approximately 25 mm (1 inch), it can be
removed by applying pressure under the tab.
(8) Using the same procedure described above,
remove the remaining bearing inserts one at a time
for inspection.
INSTALLATION
(1) Lubricate the bearing surface of each insert
with engine oil.
(2) Loosen all the main bearing caps. Install the
main bearing upper inserts.
(3) Install the lower bearing inserts into the main
bearing caps.
(4) Install the main bearing cap(s) and lower
insert(s).
(5) Tighten the bolts of caps 1, 2, 4, 5, 6, and 7 to
54 N·m (40 ft. lbs.) torque. Now tighten these bolts to
95 N·m (70 ft. lbs.) torque. Finally, tighten these
bolts to 108 N·m (80 ft. lbs.) torque.
(6) Push the crankshaft forward and backward.
Load the crankshaft front or rear and tighten cap
bolt No.3 to 54 N·m (40 ft. lbs.) torque. Then tighten
to 95 N·m (70 ft. lbs.) torque and finally tighten to
108 N·m (80 ft. lbs.) torque.
(7) Rotate the crankshaft after tightening each main
bearing cap to ensure the crankshaft rotates freely.
(8) Check crankshaft end play. Crankshaft end play
is controlled by the thrust bearing which is flange and
installed at the No.2 main bearing position.
(a) Attach a magnetic base dial indicator to the
cylinder block at either the front or rear of the
engine.
(b) Position the dial indicator rod so that it is
parallel to the center line of the crankshaft.
(c) Pry the crankshaft forward, position the dial
indicator to zero.
(d) Pry the crankshaft forward and backward.
Note the dial indicator readings. End play is the
difference between the high and low measurements
(Fig. 48). Correct end play is 0.038-0.165 mm
(0.0015-0.0065 inch). The desired specifications are
0.051-0.064 mm (0.002-0.0025 inch).
(e) If end play is not within specification, inspect
crankshaft thrust faces for wear. If no wear is
apparent, replace the thrust bearing and measure
end play. If end play is still not within specifica-
tion, replace the crankshaft.
Fig. 46 Removing Main Bearing Caps and Lower
Inserts
Fig. 47 Removing Upper Inserts
Fig. 48 Crankshaft End Play Measurement
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4.0L ENGINE
ZJ
REMOVAL AND INSTALLATION (Continued)