Refitting crankshaft

1. Rotate the exhaust side camshaft until the cam of the first cylinder faces outwards and the timing mark corresponds with that on the central cap (first cylinder in firing phase).
2. Rotate the intake side camshaft until the cam of the first cylinder faces outwards and the reference notches are staggered by 3 to 4 mm in advance so that the marks will be perfectly aligned after the timing chain has been tensioned.

REFITTING CRANKSHAFT

1. Set the main bearing halves onto the relative supports.

NOTE: The assembly onto the crankshaft must be carried out by matching the parts of the same dimensional class marked with coloured dots on the side of the bearing half and relative crankshaft journal.

2. Install thrust ring halves into their sealings and ensure that the lubrication grooves face the crankshaft shoulders.

3. Position the crankshaft after abundantly lubricating the main bearing halves.

CHECKING AXIAL PLAY OF THE CAMSHAFTS

1. Apply a centesimal dial gauge and measure the axial play of the camshafts. Check that the value is within the prescribed tolerances.

CAUTION Do not rotate the camshafts: the valves which are overlapping may strike each other and cause irreparable damage.

Camshaft axial play
0.080 to 0.124 mm

20 ÷ 22 Nm
2.04 ÷ 2.24 kgm