Checking and setting
43
Bolts to be used in event of repairs:
Bolts with hex head may be replaced by
bolts with Torx head if all the bolts on the
engine are to be changed.
Do not use bolts with hex head and bolts
with Torx head on the same engine.
Retightening cylinder head bolts
on new engines
(engine cold or warm)
by authorized specialist personnel
The cylinder heads are mounted with cyl-
inder head bolts which are tightened by
the angle-of-rotation method. On new en-
gines the cylinder head bolts are tight-
ened up for the first time at the factory af-
ter the engine has been broken in. The
sticker ”First retightening of cylinder
head bolts ...” is then attached to one of
the cylinder head covers.
First retightening of cylinder-
head-bolts completed
Erster Nachzug der Zylinder-
kopfschrauben erledigt
Spare part No. 51.97801-0211
After the first 400 hours of operation re-
tighten cylinder head bolts 1 to 4 in the
order shown in Tightening diagram ”1” by
a further 90° (1/4 revolution).
The two outer screws (intake and exhaust
sides) must not be retightened.
Note:
The cylinder head bolts to be retightened
must not be loosened first, but simply
tightened by a further 90° (1/4 revolution)
from their actual position.
Remove the sticker ”First retightening
of cylinder head bolts ...” and attach the
sticker ”Second retightening of cylinder
head bolts ...” to show that the cylinder
head bolts have been retightened for the
second time.
Second retightening of cylinder-
head-bolts completed
Zweiter Nachzug der Zylinder-
kopfschrauben erledigt
Spare part No. 51.97801-0212
MAN
4
1
2
3
Exhaust side
Intake side / injector
Tightening diagram ”1”
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