3-53
Fitting Rod Bearings
See Figure 3-72. The
new
crank pin bearing set packages
are color coded with either a red or blue identification. This
color coding is used by the bearing manufacturer only. The
color coding DOES NOT indicate size selection for crank pin
bearing replacement.
1
CAUTION
Either a red or a blue coded bearing set may be used. DO
NOT intermix bearings from a red and a blue bearing set
because this may cause excessive loading on one bear-
ing, resulting in premature bearing failure.
The bearings consist of rollers retained in steel cages.
The wide bearing (male/front rod) retains rollers both
internally and externally. The two narrow bearings
(female/rear rod) only retain the rollers externally, so care
must be taken to slide the bearing set directly from the
inner sleeve onto the crank pin; this will prevent the roll-
ers from dropping out of the cage.
Only one size replacement bearing set (standard, either
red or blue coding) is sold. Oversize bearings are not
available. Bearing clearance or fit is controlled by the
connecting rod race inside diameters and the crank pin
diameter. Two oversize crank pins are available.
1. See Figure 3-73. Measure inside diameter (ID) of lapped
connecting rod races with a dial bore gauge that has
0.0001 in. (0.0025 mm) graduations. Measure the ID at
four places as shown. Record the four measurements. If
any race ID exceeds Service Wear Limit of 1.6270 in.
(41.326 mm), replace races or connecting rod set. If race
ID measurements are less than 1.6270 in. (41.326 mm),
continue procedure as follows:
Figure 3-71. Lapping Connecting Rod Races
Connecting Rod Lapping
Arbor (Part No. HD-96740-36)
2182
Coat arbor with #220 grit
grinding compound and oil
Figure 3-72. Crank Pin Bearing Set
Figure 3-73. Measuring Connecting Rod Race
Inside Diameter
3032a
Rear rod bearings
Front rod bearing
Measure ID of each race
at four locations
3033a
b0179x3x
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