Crankshaft

CRANKSHAFT

This is forged in high strength alloy steel, induction tempered on the journals and rolled on the grooves. It rests on five main bearings and its end float is adjusted by two half rings housed in the centre main bearings. Eight counterweights accurately balance the rotating masses. A groove runs inside the shaft to lubricate the main and connecting rod journals. At the rear of the crankshaft there is the phonic wheel for detecting the rpm and timing sensor.

MAIN AND ROD BEARING HALVES

These are of the three-metal, thin shell type and they are divided into three dimensional classes.

FLYWHEEL

This is in cast iron with a hardened ring gear and suitably balanced.

PISTONS AND CONNECTING RODS

The pistons are in aluminium-silicon alloy with self-heating inserts and are divided into three dimensional classes. To ensure correct assembly an arrow is stamped on the piston crown to indicate the direction of rotation of the engine. The piston crown is concave and has four notches to prevent interference with the valve mushrooms.

The connecting rods are in hardened and tempered alloy steel, with a bushing in copper alloy force-fitted for coupling with the piston gudgeon pin. As the gudgeon pins are floating on the piston hubs and on the bushing force-fitted in the connecting rod small end, their side movement is stopped by two expanding circlips housed in the special hollows machined on the actual hubs.