The connecting rods are made from spheroid cast iron with copper alloy bushes fitted to match wih the piston gudgeon pin.The floating gudgeon pins are secured by two circlips (3) seated in specific grooves in the piston skirts.
Pistons
The aluminium-silicon alloy pistons are graded into three sizes; to ensure correct assembly, an arrow is stamped on the crown to show the direction of rotation of the engine.The piston crown is concave and has four notches to prevent interference with the valve heads.