2--31
62--11161
2.3.4 Crankshaft (Continued)
2.3.4.c Crankpin to Connecting Rod Bearing Clear-
ance
1. Clean the crankpin and the connecting rod bearing.
2. Put a strip of plastigage on the center of the crankpin
in each direction as shown in the figure.
3. Install the connecting rod cap and tighten the bolts to
the specification. (Refer to Section 2.2.7.b)
4. Remove the cap again.
5. Measure the amount of the flattening with the scale to
get the clearance.
6. If the measurement exceeds the allowable limit re-
place the connecting rod bearing.
7. If the allowable limit is not attainable with a standard
size bearing, install an undersize bearing by referring
to the table below.
Crankpin/
Connecting Rod
Clearance
Factory
Specification
0.020 to 0.051 mm
0.00079 to 0.00201 in.
Allowable
Limit
0.15 mm
0.0059 in.
Crankpin O.D.
Factory
Specification
33.959 to 33.975 mm
1.33697 to 1.33760 in.
Connecting Rod
Bearing I.D.
Factory
Specification
33.995 to 34.010 mm
1.33893 to 1.33898 in.
(Reference)
Undersize dimensions of connecting rod bearing.
Undersize
Bearing
Part Number
Marking
0.2 mm
0.008 in.
Connecting Rod
Bearing
25--34386--02
020 US
0.4 mm
0.016 in.
Connecting Rod
Bearing
25--34386--04
040 US
(Reference)
Undersize dimensions of crankpin journal.
Oversize
0.2mm / 0.008 in.
0.4mm / 0.016 in.
Dimension
A
2.3 to 2.7 mm
0.091 to 0.106 in.
2.3 to 2.7 mm
0.091 to 0.106 in.
Dimension
B
1.0 to 1.5 mm dia.
0.0394 to 0.0591 in.
dia.
1.0 to 1.5 mm dia.
0.0394 to 0.0591 in.
dia.
Dimension
C
33.759 to 33.775
mm dia.
1.32910 to 1.32973
in. dia.
33.559 to 33.575
mm dia.
1.32112 to 1.32185
in. dia.
The crankshaft journal must be fine--finished to higher than
0.8--S.