Jeep Wrangler 1997 Manual page 740

9 - 7 8
4.OL ENGINE
REMOVAL AND INSTALLATION (Continued)
COTTER
FABRICATED
PIN
\ n
TOOL
Fig. 44 Removing Upper Inserts
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95 Ym (70 ft. lbs.) torque . Finally, tighten these
bolts to 108 Nm (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 Yin (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 posi-
tion.
(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 . 45) . 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. 45 Crankshaft End Play Measurement
PISTONS AND CONNECTING RODS
TJ
(9)
If the crankshaft was removed, install the
crankshaft into the cylinder block (refer to Cylinder
Block - Assemble) .
(10) Install main bearing cap brace tighten nuts to
47 N-m (35 ft. lbs .) torque .
(11) Install the oil pan .
(12) Install the drain plug. Tighten the plug to 34
N-m (25 ft. lbs .) torque.
(13) Lower the vehicle .
(14) Install the spark plugs. Tighten the plugs to
37 N-m (27 ft. lbs .) torque.
(15) Fill the oil pan with engine oil to the full
mark on the dipstick level .
(16) Connect negative cable to battery .
REMOVAL
(1)
Remove the engine cylinder head cover.
(2) Remove the rocker arms, bridges and pivots.
(3) Remove the push rods:
(4) Remove the engine cylinder head.
(5) Position the pistons one at a time near the bot-
tom of the stroke . Use a ridge reamer to remove the
ridge from the top end of the cylinder walls . Use a
protective cloth to collect the cuttings .
(6) Raise the vehicle .
(7) Drain the engine oil .
(8) Remove the oil pan and gasket.
(9) Remove main bearing cap brace (Fig. 46) .
(10) Remove the connecting rod bearing caps and
inserts . Mark the caps and' rods with the cylinder
bore location . The connecting rods and caps are
stamped with a two letter combination (Fig. 47) .
(11) Lower the vehicle until it is about 2 feet from
the floor.