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SEM123C CYLINDER BLOCK DISTORTION AND WEAR NHEM0027S05 I Clean upper surface of cylinder block. Distortion limit: 0.10 mm (0.0039 in) I If out of specification, resurface it. The limit for cylinder block The maximum limit is as follows: A + B = 0.2 mm (0.008 in) Nominal cylinder block height from crankshaft center: 214.95 - 215.05 mm (8.4626 - 8.4665 in) I If necessary, replace cylinder block. SEM843E SEM321AA PISTON-TO-BORE CLEARANCE NHEM0027S06 1. Using a bore gauge, measure cylinder bore for wear, out-of- Cylinder bore inner diameter Grade No. Standard inner diameter Wear limit No. 1 93.000 - 93.010 mm (3.6614 - 3.6618 in) 0.20 mm (0.0079 in) No. 2 93.011 - 93.020 mm (3.6618 - 3.6622 in) No. 3 93.021 - 93.030 mm (3.6622 - 3.6626 in) If it exceeds the limit, rebore all cylinders. Replace cylinder Out-of-round (X − Y): Limit 0.015 mm (0.0006 in) Taper (A − B − C): Limit 0.015 mm (0.0006 in) 2. Check for scratches and seizure. If seizure is found, hone it. SEM174F I If both cylinder block and piston are replaced with new GI MA LC EC FE AT AX SU BR ST RS BT HA SC EL IDX CYLINDER BLOCK Inspection (Cont’d) EM-63 |