10-50 SERVICING INFORMATION CYLINDER + PISTON + PISTON RING Unit: mm (in) ITEM STANDARD LIMIT Compression pressure 1 300 – 1 700 kPa 1 000 kPa 2 (13 – 17 kgf/cm², 185 – 242 psi) (10 kgf/cm , 142 psi) Compression pressure difference — 200 kPa 2 (2 kgf/cm , 28 psi) Piston to cylinder clearance 0.035 – 0.045 0.120 (0.0014 – 0.0018) (0.0047) Cylinder bore 73.400 – 73.415 Nicks or (2.8900 – 2.8903) Scratches Piston diam. 73.360 – 73.375 73.280 (2.8882 – 2.8888) (2.8850) Measure at 15 mm (0.6 in) from the skirt end. Cylinder distortion — 0.02 (0.008) Piston ring free end gap 1st Approx. 6.5 (0.26) 5.2 (0.20) 2nd T Approx. 8.0 (0.31) 6.4 (0.25) Piston ring end gap 1st 0.06 – 0.18 0.50 (0.002 – 0.007) (0.020) 2nd T 0.06 – 0.18 0.50 (0.002 – 0.007) E (0.020) Piston ring to groove clearance 1st — 0.180 L (0.0071) 2nd — 0.150 P (0.0059) Piston ring groove width 1st 1.30 – 1.32 — (0.0512 – 0.0520) M0.81 – 0.83 2nd (0.0319 – 0.0327) — A 1.51 – 1.53 SOil (0.0594 – 0.0602) — Piston ring thickness 1st 1.08 – 1.10 — (0.0425 – 0.0433) 2nd 0.77 – 0.79 — (0.0303 – 0.0311) Piston pin bore I.D. 15.002 – 15.008 15.030 (0.5906 – 0.5909) (0.5917) Piston pin O.D. 14.995 – 15.000 14.980 (0.5903 – 0.5906) (0.5898)