Checking and setting
42
Tightening cylinder head bolts
after a repair
(engine cold)
by authorized specialist personnel
Bolts with hex 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
8
2
3
5
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
Final tightening
=
turn by 90
°
Adjust valve clearance
Retightening cylinder head bolts
after repairs
(engine cold or warm)
by authorized specialist personnel
Bolts with hex head tightened by angle-of-
rotation method only
After the first 10 to 20 hours of operation
after a repair turn the cylinder head bolts
by a further 90
°
(1/4 revolution) in the
order shown in Tightening diagram.
The cylinder head bolts to be retightened
must not be loosened first, but simply tigh-
tened by a further 90
°
(1/4 revolution)
from their actual position.
Attach the sticker “First retightening of
cylinder head bolts ...” (Remove any
other stickers which may already be at-
tached).
After the first 400 hours of operation after
a repair tighten cylinder head bolts 1 to 8
in the order shown in Tightening diagram
again by a further 90
°
(1/4 revolution).
Attach the sticker “Second retightening
of cylinder head bolts ...”.
Note:
When a cylinder head has been re-
moved the cylinder head gasket must
always be changed.
Retightening cylinder head bolts
on new engines or after repairs
Bolts with Torx head tightened by angle-
of-rotation method only
Bolts with Torx head tightened by the
angle-of-rotation method must not
be retightened!
Summary of Contents for D 0826 LE
Page 1: ...Operating Instructions Diesel Engine D 0826 LE D 0826 LE 201...
Page 2: ......
Page 12: ...Technical information 10 Engine views D 0826 LE 1 2 3 4 5 6 7 8 9 10...
Page 47: ...Notes 45...
Page 53: ......
