Engine Specifications for the proper clearance. Plas-
tigage should indicate the same clearance
across the entire width of the insert. If the
clearance varies, it may be caused by either a
tapered journal, bent connecting rod or foreign
material trapped between the insert and cap or
rod.
(8) If the correct clearance is indicated, replace-
ment of the bearing inserts is not necessary. Remove
the Plastigage from crankshaft journal and bearing
insert. Proceed with installation.
(9) If bearing-to-journal clearance exceeds the
specification, install a pair of 0.0254 mm (0.001 inch)
undersize bearing inserts. All the odd size inserts
must be on the bottom. The sizes of the service
replacement bearing inserts are stamped on the
backs of the inserts. Measure the clearance as
described in the previous steps.
(10) The clearance is measured with a pair of
0.0254 mm (0.001 inch) undersize bearing inserts
installed. This will determine if two 0.0254 mm
(0.001 inch) undersize inserts or another combination
is needed to provide the correct clearance (refer to
Connecting Rod Bearing Fitting Chart).
CONNECTING ROD BEARING FITTING CHART
CRANKSHAFT JOURNAL CORRESPONDING CONNECTING ROD BEARING INSERT
Color Code Diameter Upper Insert Size Lower Insert Size
Yellow 53.2257-53.2079 mm Yellow - Standard Yellow - Standard
(2.0955-2.0948 in.)
Orange 53.2079 - 53.1901 mm Yellow - Standard Blue - Undersize
(2.0948 - 2.0941 in.) 0.025 mm (0.001 in.)
0.0178 mm (0.0007 in.)
Undersize
Blue 53.1901 - 53.1724 mm Blue - Undersize Blue - Undersize
(2.0941 - 2.0934 in.) 0.025 mm (0.001 in.) 0.025 mm (0.001 in.)
0.0356 mm (0.0014 in.)
Undersize
Red 52.9717 - 52.9539 mm Red - Undersize Red - Undersize
(2.0855 - 2.0848 in.) 0.254 mm (0.010 in.) 0.254 mm (0.010 in.)
0.254 mm (0.010 in.)
Undersize
Fig. 32 Measuring Bearing Clearance with
Plastigage
1 – PLASTIGAGE SCALE
2 – COMPRESSED PLASTIGAGE
9 - 22 2.5L ENGINE XJ
SERVICE PROCEDURES (Continued)
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