Technical data

Repair instructions

Torque the cylinder head screws in the numbered se-

quence in the tightening schedule, four times.

1st tightening: 30 Nm (3 kpm)

2nd tightening:

6(x) series: 85 Nm (8.5 kpm)

7(x) series: 90 Nm (9 kpm)

3rd tightening:

6(x) series: 85 Nm (8.5 kpm)

7(x) series: 90 Nm (9 kpm)

4th tightening:

Angle tighten the screws 60° in numbered order, as

follows:

Mark up the screw head positions with chalk

marks on the screws and cylinder head. Do not

use a centre punch or scriber, since this could

cause confusion later on.

Mark up a 15 mm socket, put the socket as in the

illustration above, i.e. with the sleeve marking dis-

placed one spanner flat anti-clockwise from the

chalk mark.

Then carry out the angle tightening by turning until

the sleeve marking coincides with the chalk mark

on the top of the cylinder head.

Once all screws have been tightened 60°, tighten-

ing is completed. No subsequent torquing is nec-

essary.

Install the push rods and rocker mechanism. Tighten-

ing torque: For the 61 series with steel bearing caps,

use 65 Nm (6.5 kpm)

Later versions of the 61 series, and all engines in the

62 and 63 series should have a torque of 50 Nm (5.0

kpm).

The 71 and 72 series engines should have 65 Nm (6.5

kpm).

* The steel bearing cap has been replaced by an aluminium bear-

ing cap as a spare part.

Adjust the valve clearance and install the valve

covers, as in the instructions on page 52.