INSPECTION AND REPAIR OF BASIC ENGINE
6-15
4.8 Measuring clearance between connecting
rod bearing and crankpin
&$87,21
When grinding crank pins, be sure to grind all the pins
to the same size.
Finish the fillet radius to the specified dimension.
(1) Reassemble the bearing into the big end of the
connecting rod.
(2) Tighten the connecting rod cap bolts to the specified
torque.
(3) Measure the inside diameter of the connecting rod
bearing.
(4) Measure the outside diameter of the crank pin.
(5) Calculate the clearance from the difference between the
inside diameter of the connecting rod bearing and
outside diameter of the crank pin.
(6) Replace the connecting rod bearing if the clearance
exceeds the limit.
(7) Measure the clearance between the connecting rod
bearing and the crank pin again. Use the undersize
bearing if the limit is exceeded.
(8) If an undersize bearing is used, grind the crank pin to
the specified undersize.
Measuring connecting rod bearing inside diameter
Measuring crankpin outside diameter
Finish dimension of fillet radius
Item Nominal Standard Limit
Pin outside
diameter (STD)
ø 48 mm
[1.89 in.]
47.950 to 47.965 mm
[1.8878 to 1.8884 in.]
-
Oil clearance -
0.025 to 0.072 mm
[0.0010 to 0.0028 in.]
0.150 mm
[0.0059 in.]
Item Undersize Finish dimension
Crankpin
undersize
0.25 mm
[0.0098 in.]
ø 47.75
-0.050
-0.035
mm
[1.8799
-0.0020
-0.0014
in.]
0.50 mm
[0.0197 in.]
ø 47.50
-0.050
-0.035
mm
[1.8701
-0.0020
-0.0014
in.]
0.75 mm
[0.0295 in.]
ø 47.25
-0.050
-0.035
mm
[1.8602
-0.0020
-0.0014
in.]
32.4 to 37.3 N·m
{3.3 to 3.8 kgf·m}
[24 to 27 lbf·ft]
Measuring
points
Measuring
directions
Measuring
points
Measuring
directions
R2.5 mm
[0.098 in.]
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