Engine Structure (03.01)

Engine Structure (03.01)

Description

Engine Block

Dowels are installed to the principal mating faces of the block to ensure accurate alignment of cylinder heads, front timing cover, auxiliaries, etc.

The 60° V12 aluminium engine block incorporates paths for water cooling, oil distribution and positive crankcase ventilation. The seven main bearing caps supporting the crankshaft are bolted laterally as well as vertically to provide additional crankcase stiffening whilst keeping engine weight to a minimum. Each bearing cap is numbered to identify its position in the engine block The 12 cast iron cylinder liners are inserted and machined during block production and require specialist equipment for replacement.

The crankshaft is mounted in 7 main bearings with end loads absorbed by thrust washers at number 4 main bearing. Main bearing bolts are of the 'torque to yield' type and must be renewed if removed.

A twin sprocket installed to the front end of the crankshaft drives the camshaft chains. A damper pulley installed on the crankshaft nose drives the engine auxiliaries via a polyvee drive belt. Also at the front of the engine a timing disc is installed together with two crankshaft sensors. The sensors provide engine position signals to the two Engine control modules.