Connecting Rod Bearing Fitting Chart - Jeep 1979 CJ-5 Technical & Service Manual

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Bearing Color Code
Lower Insert Size
Connecting Rod Bearing Fitting Chart
Crankshaft Connecting Rod Journal
Color and Diameter in
inches (Journal Size)
Upper Insert Size
Yellow - 2 . 0 9 5 5 t o 2.0948 (Standard)
Orange - 2 . 0 9 4 8 t o 2.0941 (0.0007 Undersize)
Black - 2 . 0 9 4 1 t o 2.0934 (0.0014 Undersize)
Red - 2 . 0 8 5 5 to 2.0848 (0.010 Undersize)
Yellow — Standard
Yellow — Standard
Black — .001-Inch Undersize
Red — .010-Inch Undersize
color-coded bearing inserts as shown in the bearing fit-
ting chart. The bearing color code appears on the edge of
the insert.
NOTE: Bearing size is not stamped on inserts used in
production.
The rod journal size is identified in production by a
color coded paint mark on the adjacent cheek or counter-
weight toward the flanged (rear) end of the crankshaft.
The color codes used to indicate journal size are shown
in the bearing fitting chart.
When required, upper and lower bearing inserts of
different sizes may be used as a pair. A standard size
insert is sometimes used in combination with a 0.001-
inch (0.025 mm) undersize insert to reduce clearance
0.0005 inch (0.013 mm).
NOTE: Never use a pair of bearing inserts with more
than
0.001-inch
(0.025
mm) difference in size.
Example:
Bearing insert Pairs
Insert Correct Incorrect
Upper Standard
Standard
Lower
0.001-inch
undersize
0.002-inch
undersize
7 0 2 4 2
Service replacement bearing inserts are available as
pairs in the following sizes: standard, 0.001-, 0.002-,
0.010- and 0.012-inch undersize. The bearing size is
stamped on the back of service replacement inserts.
NOTE: The
0.002-
and
0.012-inch
undersize inserts are
not used in production.
Removal
(1) Drain engine oil.
(2) Remove oil pan and gaskets.
(3) Rotate crankshaft as required to position two
connecting rods at a time at bottom of stroke.
(4) Remove connecting rod bearing cap. Remove
lower bearing insert.
(5) Remove upper bearing insert by rotating it out
of connecting rod.
Yellow — Standard
Black — .001-inch Undersize
Black — .001 -inch Undersize
Red — .010-inch Undersize
6 0 2 6 1
NOTE: Do not mix bearing caps. Each connecting rod
and its matching cap is stamped with the cylinder num-
ber on a machined surface adjacent to the oil squirt hole
which faces the camshaft side of the engine block.
Inspection
(1) Clean inserts.
(2) Inspect linings and backs of inserts for irregular
wear pattern. Note any scraping, stress cracks or dis-
coloration (fig. 1B-36). If bearing has spun in rod, re-
place bearing and connecting rod and inspect crankshaft
journal for scoring.
(3) Inspect for material imbedded in linings which
may indicate piston, timing gear, distributor gear or oil
pump gear problems. Figures 1B-37 and 1B-38 show
common score patterns.
(4) Inspect fit of bearing locking tab in rod cap. If
inspection indicates that insert may have been caught
between rod and rod cap, replace upper and lower bear-
ing inserts.
(5) Inspect insert in area of locking tab. Abnormal
wear indicates bent tabs or improper installation of
inserts (fig. 1B-39).
(6) Replace bearing inserts that are damaged or
worn.
L O C K I N G TABS
LOWER
• 6 0 7 5 7
Fig. 1B-36 Connecting 111 Soaring lispiitln