Komatsu 4D98 Series Shop Manual page 179

12. Service Standards
(3.4) Piston and ring
(Measure in the direction vertical to the
ard from the bottom
end
Pin outside diameter
36.989 - 37.000 36.959
Clearance
0.000 - 0.022 0.080
Pinton ring
mm
4TNE94.98 Top ring Ring width
groove
2.040 - 2.060
Ring width 1.940 - 1.960 1.920
Side clearance 0.080 - 0.120
End clearance
0.250 - 0.450 0.540
Second ring Ring width
groove
2.080 - 2.095 2.195
Ring width
1.970 - 1.990 1.950
Side clearance
0.090 - 0.125 0.245
End clearance
0.450 - 0.650 0.730
Oil ring Ring width
groove
3.015 - 3.030 3.130
Ring width 2.970 - 2.990 2.950
Side clearance 0.025 - 0.060 0.180 4-27
End clearance
0.250 - 0.450 0.550
4TNE106(T)
Top ring Ring groove width 2.520 - 2.540
j -
Ring width 2.440 - 2.460 2.420
Side clearance 0.060 - 0.100
End clearance
0.300 - 0.450 0.540
Second ring Ring width
groove 2.070 - 2.085 2.185
Ring width 1.970
'
- 1.990
,
1.950
Side clearance 0.080 - 0.115 0.235
End clearance
0.450 - 0.600 0.680
Oil ring Ring width groove
3.015 - 3.030 3.130
/
Ring width
2.970 - 2.990 2.950
Side clearance
0.025 - 0.060 0.180
End clearance 0.300 - 0.500 0.600
12-5