Technical data Wear tolerances Note: Unless otherwise stated the given values refer to all engines. General Compression pressure at starter motor speed (min. 200 rpm) .... min. 25 kp/cm 2 (355.6 lbf/int) Pistons Piston clearance max. 0.25 mm (.0098 in) Piston rings Piston ring clearance in groove: Compression rings Oil ring Piston ring gap in cylinder max. 0.25 mm (.0098 in) max. 0.15 mm (.0059 in) max. 1.0 mm (.0393 in) Gudgeon pins Gudgeon pin diameter: MD2010 . MD2020 MD2030 MD2040 Clearance, gudgeon pin - bushing gudgeon pin - hole min. 18.98 mm (.7472 in) min. 20.98 mm (.8259 in) min. 27.98 mm (1.1015 in) max. 0.08 mm (.0031 in) max. 0.02 mm (.0007 in) Cylinder head Distortion max.
0.12 mm (.0047 in) Cylinder block Distortion (top plane) Cylinder diameter max. 0.12 mm (.0047 in) MD2010 . MD2020 0.2 mm (.00787 in) oversize 0.5 mm (.01969 in) oversize MD2030 0.5 mm (.01969 in) oversize 1.0 mm (.03937 in) oversize MD2040 0.5 mm (.01969 in) oversize 1.0 mm (.03937 in) oversize max. 67.2 mm (2.6456 in) max. 67.7 mm (2.6653 in) max. 68.2 mm (2.6850 in) max. 75.2 mm (2.9606 in) max. 75.7 mm (2.9803 in) max. 76.2 mm (3.0000 in) max. 84.2 mm (3.3149 in) max. 84.7 mm (3.3346 in) max. 85.2 mm (3.3543 in) 1 5