Jeep Wrangler 1997 Manual page 707

TJ
REMOVAL AND INSTALLATION (Continued)
(3) Lubricate the piston and rings with clean
engine oil .
CAUTION : Ensure that connecting rod bolts do not
scratch the crankshaft journals or cylinder walls.
Short pieces of rubber hose slipped over the con-
necting rod bolts will provide protection during
installation .
(4) Use a piston ring compressor to install the con-
necting rod and piston assemblies through the top of
the cylinder bores (Fig. 56) .
(5) Ensure the arrow on the piston top points to
the front of the engine (Fig. 56) .
Fig. 56 Rod and Piston Assembly Installation
(6) Raise the vehicle .
(7) Each bearing insert is fitted to its respective
journal to obtain the specified clearance between the
bearing and the journal . In production, the select fit
is obtained by using various-sized, color-coded bear-
ing inserts as listed in the Connecting Rod Bearing
Fitting Chart. The color code appears on the edge of
the bearing insert . The size is not stamped on inserts
used for production of engines.
(8) The rod journal is identified during the engine
production by a color-coded paint mark on the adja-
cent cheek or counterweight toward the flange (rear)
end of the crankshaft . The color codes used to indi-
cate journal sizes are listed in the Connecting Rod
Bearing Fitting Chart.
(9) When required, upper and lower bearing
inserts of different sizes may be used as a pair (refer
to Connecting Rod Bearing Fitting Chart). A stan-
dard size insert is sometimes used in combination
with a 0 .025 mm (0.001 inch) undersize insert to
reduce clearance 0.013 mm (0 .0005 inch) .
CAUTION : DO NOT intermix bearing caps . Each
connecting rod and bearing cap are stamped with
the cylinder number. The stamp is located on a
machined surface adjacent to the oil squirt hole
that faces the camshaft side of the cylinder block.
2.51- ENGINE
9-45
(10) Install the connecting rod bearing caps and
inserts in the same positions as removed .
CAUTION : Verify that the oil squirt holes in the
rods face the camshaft and that the arrows on the
pistons face the front of the engine .
(11) Install the oil pan and gaskets as outlined in
the installation procedure .
(12) Lower the vehicle .
(13) Install the engine cylinder head, push rods,
rocker arms, bridges, pivots and engine cylinder head
cover.
(14) Fill the crankcase with engine oil .
REAR MAIN OIL SEALS
REMOVAL
(1) Remove the flywheel or converter drive plate .
Discard the old bolts .
(2) Pry out the seal from around the crankshaft
flange (Fig. 57) .
CRANKSHAFT' \CRANKSHAFT
OIL SEAL
J8909-149
Fig . 57 Replacement of Rear Crankshaft Oil Seal
INSTALLATION
(1) Coat the outer lip of the replacement rear main
bearing seal with engine oil .
(2) Carefully position the seal into place. Use rear
main Seal Installer Tool 6271A to install the seal
flush with the cylinder block.
CAUTION : The felt lip must be located inside the
flywheel mounting surface. If the lip is not posi-
tioned correctly the flywheel could tear the seal.
(3) Install the flywheel or converter drive plate.
New bolts MUST be used when installing the fly-
wheel or converter plate. Tighten the new bolts to 68