Crank shaft

Description 1024A

1.1, 1.2 8v

Made from cast iron, induction hardened. It rests on five main bearings with bearing shells graded into different sizes.

The crankshaft endfloat is adjusted by two thrust washers located by the centre main bearings.

Eight counterweights arranged at 180° ensure that the crankshaft rotating masses are perfectly balanced.

A channel runs along the inside of the shaft to lubricate the main bearings and big end bearings.

1.3 JTD 16v

Made from steel, it rests on five main journals and the endfloat is adjusted by two thrust washers located in the rear main bearing.

Eight counterweights ensure that the rotating masses of the crankshaft are precisely balanced.

A series of channels run along the inside of the crankshaft to lubricate the main bearings and big end bearings.

1.1, 1.2 8v

The crankshaft consists of:

• main journals (1), through which it rolls on the supports with (friction type) bearings;
• crank pins (2), over which the connecting rod big ends fit;
• crank arms (3), the same height as half the travel, which connect the main journals to the crank pins.

The shaft is already prepared for:

• the fitting of the flywheel;
• the fitting of the gear which, via a toothed belt, transmits the power to the timing system components.

OPERATION

The crankshaft consists of:

• main journals (1), through which it rolls on the supports with (friction type) bearings;
• crank pins (2), over which the connecting rod big ends fit;
• crank arms (3), the same height as half the travel, which connect the main journals to the crank pins.

OPERATION

There may be two firing orders: 1, 2, 4, 3 or 1, 3, 4, 2; the most common firing order is 1, 3, 4, 1 as the centrifugal forces and inertia forces are more balanced.