Jeep J-10 Series 1982 Technical & Service Manual page 157

ENGINES 1B-89
Connecting Rod Bearing Fitting Chart
Crankshaft Conflicting Rod Journal tearingColor Codi
Color Coda and DiaiMtir ii Inchis
(Journal Sizt) Uppr Inrt Szi Lowir Inssrt Sin
Yellow
-2.0955 to 2.0948
(53.2257 - 53.2079 mm) (Standard)
Yellow
- Standard
Yellow
— Standard
Orange
-2.0948 to 2.0941
(53.2079 - 53.1901 mm) (0.0007 Undersize)
Yellow
— Standard
Black — 0.001-inch (0.025mm)Undersize
Black -2.0941 to 2.0934
(53.1901 - 53.1723 mm) (0.0014 Undersize)
Black - 0.001-Inch (0.025mm)Undersize
Black
-0.001-inch (0.025mm)Undersize
Red
-2.0855 to 2.0848
(52.9717 - 52.9535 mm) (0.010 Undersize)
Red
-0.010-Inch (0.254mm)Undersize
Red
-0.010-inch (0.254mm)Undersize
Service replacement bearing inserts are available in
pairs in the following sizes: standard, 0.001-inch (0.025
mm) undersize, 0.002-inch (0.051 mm) undersize, 0.010-
inch (0.254 mm) undersize and 0.012-inch (0.305 mm)
undersize. The size is stamped on the back of service
replacement inserts.
NOTE: The 0.002-inch (0.051 mm) and 0.012-inch (0.305
mm) undersize inserts are not used for production en
gine assembly.
Removal
Use the following procedure to service connecting rod
bearings with the engine installed in the vehicle.
(1) Drain engine oil.
(2) Remove oil pan.
(3) Rotate crankshaft as required to position two
connecting rods at a time at bottom of their stroke.
(4) Remove bearing caps and lower inserts.
(5) Remove upper insert by rotating insert out of
connecting rod.
NOTE: Do not interchange bearing caps. Connecting
rod and corresponding cap are stamped with the associ
ated cylinder number (fig. 1B-130). The numbers are
located on a machined surface opposite the squirt holes.
Inspection
(1) Clean inserts
(2) Inspect linings and backs of inserts for irregular
wear pattern. Note any scraping, stress cracks or dis
tortion (fig. 1B-132). If bearing has spun in rod, replace
bearing and connecting rod and inspect crankshaft jour
nal for scoring.
(3) Inspect for material imbedded in linings that
may indicate abnormal piston, timing gear, distributor
gear or oil pump gear wear. Figures 1B-133 and 1B-134
depict common score problems.
(4) Inspect fit of insert locking tab in rod cap. If
result of inspection indicates that insert tab may have
been pinched between rod and rod cap, replace upper
and lower bearing inserts.
LOCKING TABS
/ UPPER
WEAR PATTERN-
ALWAYS GREATER
ON UPPER INSERT
LOWER
INSERT
60270
MATING EDGES
GROOVES
CAUSED BY
ROD BOLTS
SCRATCHING
JOURNAL
DURING
INSTALLATION
V - -
60757
Fig. 1B-132 CoRnictleg Rod Bearing Inspection
LOWER INSERT
UPPER INSERT
60759
Fig. IB-133 Scoring Caused by Insufficient Lubrication
(5) Inspect contact area of locking tab. Abnormal
wear indicates bent tabs or improper installation of
inserts (fig. 1B-135).
(6) Replace bearing inserts that are damaged or
worn.