Rear Main Oil Seal - Jeep cherokee 2000 Service Manual

9 - 52 2.5L ENGINE
REMOVAL AND INSTALLATION (Continued)
Fig. 86 Removal of Connecting Rod and Piston
Assembly
1 – PISTON
2 – CONNECTING ROD
3 – CYLINDER BLOCK
INSTALLATION
(1) Clean the cylinder bores thoroughly. Apply a
light film of clean engine oil to the bores with a clean
lint-free cloth.
(2) Install the piston rings on the pistons if
removed.
(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.
(5) Use a piston ring compressor to install the con-
necting rod and piston assemblies through the top of
the cylinder bores (Fig. 87).
(6) Ensure the arrow on the piston top points to
the front of the engine (Fig. 87).
(7) Raise the vehicle.
(8) 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
Fig. 87 Rod and Piston Assembly Installation
the bearing insert. The size is not stamped on inserts
used for production of engines.
(9) 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.
(10) 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.
(11) 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.
(13) Install the oil pan and gaskets as outlined in
the installation procedure.
(14) Lower the vehicle.
(15) Install the engine cylinder head, push rods,
rocker arms, bridges, pivots and engine cylinder head
cover.
(16) Fill the crankcase with engine oil.

REAR MAIN OIL SEAL

REMOVAL
(1) Remove the flywheel or converter drive plate.
Discard the old bolts.
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