Description

DESCRIPTION

Turbodiesel engine, direct injection without pre-combustion chamber, 4 cylinders in line, 1910 c.c., two valves per cylinder, one overhead camshaft, air supercharging by turbocharger and intercooler, Bosch Common Rail EDC-15C electronic injection system.

CRANKCASE

The crankcase is in spheroidal cast iron with integral cylinder liners of the closed-deck type. The crankshaft is supported by five main bearings. Special grooves machined in the crankcase walls allow the flow of coolant fluid and lubricating oil. A jet is installed in the lower part which sprays oil to cool the piston skirts and lubricate the gudgeon pin.

CRANKSHAFT

This is in cast iron and rests on five main bearings and its end float is adjusted by two half rings housed in the rear main bearing. Eight counterweights accurately balance the rotating masses. A groove runs inside the shaft to lubricate the main bearing and connecting rod journals. The phonic wheel for the rpm sensor is installed at the rear.

CYLINDER HEAD

The cylinder head is in one piece and made from aluminium and silicon alloy. The two parallel and vertical valves per cylinder are installed in their valve guides and controlled by a single overhead camshaft, the cams of which act on mechanical tappets. The valve guides are force-fitted in their seats on the cylinder head by interference and the inside diameter is perfected after assembly using a special bore.

Unlike heads with pre-combustion chamber, the whole combustion process takes place in the combustion chamber machined in the piston. The seal between the cylinder head and crankcase is made from aramidic fibre and there is no need to retighten the head throughout the whole life of the engine.