INSPECTION AND REPAIR OF BASIC ENGINE
6-16
4.8 Inspecting oil clearance of connecting rod
bearing
(1)
Install the bearing to the connecting rod big end. After
tightening the connecting rod cap with the specified
torque, measure the inside diameter of the bearing.
Measuring connecting rod bearing inside diameter
(2) Measure the crankpin outside diamter. Calculate the oil
clearance of connecting rod bearing by differential
between the bearing inside diamter and the crankshaft
pin outside diamter.
Measuring crankpin diameter
(3) If the oil clearance exceed the limit, install the new
bearing and calculate the oil clearance again.
(4) Even so it exceeds the limit, use undersize bearings.
(0.25, 0.50, 0.75 U.S) If an undersize bearing is used,
grind the crankpin to the specified undersize refer to the
following chart.
&$87,21
(a) When grinding the crankshaft pin, be sure to grind
the all pin to same size.
(b) Finish the fillet R to R3±0.2 mm [R0.1181±0.0079
in.] or less.
Width of crankshaft thrust bearing surface
Item Nominal Standard Limit
connecting rod bearing
inside diameter
ø 58 mm
[2.28 in.]
58.000 to 58.045 mm
[2.2835 to 2.2852 in.]
-
Measuring
directions
Measuring
points
Tightening torque
54 ± 5 N·m
{5.5 ± 0.5 kgf·m}
[40 to 3.6 lbf·ft]
Item Nominal Standard Limit
Pin outside
diameter
(S.T.D)
ø 58 mm
[2.2835 in.]
57.950 to 57.970 mm
[2.2815 to 2.2823 in.]
-
Oil clearance -
0.030 to 0.095 mm
[0.0012 to 0.0037 in.]
0.200 mm
[0.0079 in.]
Measuring
points
Measuring
directions
Item Undersize Finished size
Crankpin
undersize
0.25 mm
[0.0098 in.]
ø 57.75
-0.050
-0.030
mm
[2.2736
-0.0020
-0.0012
in.]
0.50 mm
[0.0197 in.]
ø 57.50
-0.050
-0.030
mm
[2.2638
--0.0020
0.0012
in.]
0.75 mm
[0.0295 in.]
ø 57.25
-0.050
-0.030
mm
[2.2539
-0.0020
-0.0012
in.]
R3 ± 0.2 mm or less
[0.12 ± 0.008 in.]
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