Checking and setting
49
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 tigh-
tened up for the first time at the factory
after 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 retigh-
tened 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
Intake side / injector
MAN
1
2
4
3
Exhaust side
Tightening diagram “1”
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