Pistons

Pistons










Piston running clearance (example)







Measured cylinder diameter 83.015 mm
Measured piston diameter 82.995 mm
The piston running clearance is 0.020 mm
The piston running clearance must be 0.010 - 0.030 mm

Piston rings

Axial clearance
Upper compression ring 0.030 - 0.070 mm
Lower compression ring 0.030 - 0.070 mm
Oil control ring assembly 0.038 - 0.142 mm

Compression ring dimension
Upper 1.20 -0.010/-0.030 mm
Lower 1.50 -0.010/-0.030 mm







Dimension, three piece oil ring
Spring 1.51 ± 0.020 mm
Rail 0.46 ± 0.011 mm

Piston pin
Diameter 21.000 +0/- 0.004 mm

Installing piston rings