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AEM023 Inspection NHEM0054 PISTON AND PISTON PIN CLEARANCE NHEM0054S01 1. Measure inner diameter of piston pin hole “dp”. Standard diameter “dp”: Grade No. 0 21.993 - 21.999 mm (0.8659 - 0.8661 in) Grade No. 1 21.999 - 22.005 mm (0.8661 - 0.8663 in) AEM024 2. Measure outer diameter of piston pin “Dp”. Standard diameter “Dp”: Grade No. 0 21.989 - 21.995 mm (0.8657 - 0.8659 in) Grade No. 1 21.995 - 22.001 mm (0.8659 - 0.8662 in) 3. Calculate interference fit of piston pin to piston. Dp − dp = 0.002 - 0.006 mm (0.0001 - 0.0002 in) If it exceeds the above value, replace piston assembly with pin. SEM024AA PISTON RING SIDE CLEARANCE NHEM0054S02 Side clearance: Top ring 0.045 - 0.080 mm (0.0018 - 0.0031 in) 2nd ring 0.030 - 0.070 mm (0.0012 - 0.0028 in) Oil ring 0.065 - 0.135 mm (0.0026 - 0.0053 in) Max. limit of side clearance: Top ring 0.11 mm (0.0043 in) If out of specification, replace piston ring. If clearance exceeds SEM599A PISTON RING END GAP NHEM0054S03 End gap: Top ring 0.23 - 0.33 mm (0.0091 - 0.0130 in) Max. limit of ring gap: Top ring 0.54 mm (0.0213 in) GI MA LC EC FE AT AX SU BR ST RS BT HA SC EL IDX CYLINDER BLOCK Inspection EM-75 |