Crankshaft and Piston
The crankshaft is of cast iron design. 5 main journals are supported by the cylinder block, bearing cap and main bearings with a suitable oil clearance. The 3rd main bearing is selective and provides an axial clearance of crankshaft and is a thrust bearing. The connecting rods are assembled on 4 pin journals each with metal bearings to change the movement from reciprocating to rotating. On the front side, there is a damper pulley for belt drive and a timing sprocket for belt drive. On the rear side, there is a flywheel or a flexible plate to transport the engine torque to transmission.
The pistons are a cast aluminum crown design. They have 2 compression rings and 1 oil ring. There is a piston pin of full floating type. It floats in the piston pin bore and connecting rod pin bore, and it is fixed by retainers at both ends.
The connecting rod and rod cap are assembled on the crankshaft with bearings.