Checking and setting
43
Tightening cylinder head bolts
after a repair
(engine cold)
by authorized specialist personnel
Bolts with Torx head tightened by angle-
of-rotation method only
Caution:
Used cylinder head bolts must not be
re-used.
Before inserting the cylinder head bolts oil
them with engine oil on the thread (not to
the bore) and coat the contact face of the
bolt head with “Optimoly White T” assem-
bly paste. Do not use any oils or oil addi-
tives that contain MoS
2
. The bolts must be
tightened by the angle-of-rotation method
as shown in Tightening diagram.
7 1 4 6
8235
Tightening diagram
D 1st pretightening step = to 10 Nm
D 2nd pretightening step = to 80 Nm
D 3rd pretightening step = to 150 Nm
D 4th pretightening step = turn by 90°
D 5th pretightening step = turn by 90°
D Final tightening = turn by 90°
Adjust valve clearance
Attach sticker 51.97801–0150.
V-belts
The tension of the V-belts should be
checked after every 200 hours of oper-
ation.
Change the V-belts if necessary
If, in the case of a multiple belt drive, wear
or differing tensions are found, always re-
place the complete set of belts.
Checking condition
Check V-belts for cracks, oil, overheating
and wear.
Change demaged V-belts.
Testing by hand
A more precise check of the V-belt tension
is possible only by using a V-belt tension
tester.
Check with V-belt tension tester
1
Measuring tension
D Lower indicator arm À into the scale
D Apply tester to belt at a point midway
between two pulleys so that edge of
contact surface Á is flush with the
V-belt
To Next Page
Loading...
Need help?
General
