Oil sump

The cylinder head seal is supplied in three different thicknesses and the correct one is chosen on the basis of the average protrusion of the pistons from the upper surface of the engine block; this maintains the compression ratio within the prescribed limits.

After the interventions to grind down the main and rod journals, the crankshaft should be again subjected to the nitriding treatment, to reset its initial characteristics.

After this operation, the crankshaft should be checked to ensure that the deformation falls within prescribed limits, and that it can not be straightened; otherwise it must be replaced.

The crankshaft rests on five main supports and the radial clearance is regulated by two half rings housed on the rear main support.

Eight counterweights ensure that the rotating masses are equally balanced.

A channel runs inside the shaft to lubricate the main and rod journals. The machining holes on these channels are blocked with plugs; when the engine is overhauled they should be removed and cleaned thoroughly.

OIL SUMP

Made from stamped plate, it is also fitted with anti-splash walls.

The oil sump also contains the seating of the engine oil temperature sensor and the oil return from turbocharger connection is also fitted here.

A suitably positioned gasket acts as seal between the sump and the engine block.

CRANKSHAFT

This is forged in a high resistance steel alloy and hardened and tempered.

In order to improve its mechanical resistance and wear characteristics, the crankshaft is subjected to a soft nitriding treatment.

MAIN AND ROD BEARING HALVES

They are the thin shell, three metal type and are divided into two dimensional classes, they are supplied to parts in another five decrease classes.

The main bearing halves have three holes to lubricate the main journals.

FLYWHEEL

Made from cast iron, with a ring gear in tempered steel, it is suitably balanced.

The flywheel has a precise position which must be respected during assembly: after the pistons of the first and fourth cylinders have been brought to T.D.C. the flywheel must be assembled making sure that the notch engraved on it faces upwards.