Man D 2866 E Operating Instructions Manual page 52

Tightening cylinder head bolts
after a repair
(engine cold)
by authorized specialist personnel
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
tightened by the angle-of-rotation method
as shown in Tightening diagram "2".
Intake side / injector
1
3
MAN
Exhaust side
Tightening diagram "2"
D 1st pretightening step =
D 2nd pretightening step =
D 3rd pretightening step =
D 4th pretightening step =
D Final tightening
Adjust valve clearance
Checking and setting
. The bolts must be
2
6
4
2
5
to 10 Nm
to 80 Nm
to 150 Nm
turn by 90°
= turn by 90°
Retightening cylinder head bolts
after repairs
(engine cold or warm)
by authorized specialist personnel
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 "2".
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 4
in the order shown in Tightening diagram
"1" again by a further 90° (1/4 revolution).
The two outside screws (intake and ex-
haust side) must not be retightened.
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.
50