Yanmar 2YM15 - Page 226

13. Service standards
205R1
(4) Piston and ring
1) Piston
2) Piston ring
mm
Inspection item Standard Limit
Reference
page
Piston outside diameter
(Measure in the direction vertical to
the piston pin.)
3YM30 75.965-75.975 75.920
5.3.1(1)
3YM20/2YM15 69.970-69.980 69.925
Piston diameter measure position
(Upward from the bottom end of the piston)
22 -
Clearance
between piston and cylinder
3YM30 0.035-0.055 -
3YM20/2YM15 0.030-0.050 -
Piston pin hole inside diameter 22.000-22.009 22.039
5.3.2Piston pin outside diameter 21.995-22.000 21.965
Clearance 0.000-0.014 0.074
3YM30 mm
Inspection item Standard Limit
Reference
page
Top ring Groove width 1.550-1.570 -
5.3.3(1)
Ring width 1.470-1.490 1.450
Side clearance 0.060-0.100 -
Ring gap 0.15-0.30 0.390
Second ring Groove width 1.580-1.595 1.695
Ring width 1.430-1.450 1.410
Side clearance 0.013-0.165 0.285
Ring gap 0.18-0.33 0.420
Oil ring Groove width 3.010-3.030 3.130
Ring width 2.970-2.990 2.950
Side clearance 0.020-0.060 0.180
Ring gap 0.20-0.45 0.540