Torque guide values
159
Retightening of the cylinder head bolts
(Engine cold or warm)
The cylinder heads are fitted with cylinder−head
bolts for rotation angle tightening. On new engi-
nes, the cylinder−head bolts are retightened at
the factory after running in and marked by the
sticker “First retightening of cylinder−head
bolts ...” on a cylinder head cover.
After the first 400 hours of operation, following a
repair, tighten the cylinder-head bolts in the order
specified in the tightening schedule “1” by 90°
(1/4 turn).
Note:
The cylinder-head bolts to be retighte-
ned must not be loosened; they are to
be tightened further from their current
position by 90° (1/4 turn).
Remove the sticker “First retightening of the
cylinder−head bolts ...” and attach the sticker
“Second retightening of the cylinder−head
bolts ...” to verify the second retightening.
Second retightening of cylinder-
head-bolts completed
Zweiter Nachzug der Zylinder-
kopfschrauben erledigt
Spare part no. 51.97801−0211
Intake side
1
3
6
5
2
4
Exhaust side
Tightening schedule “1”
Second retightening of cylinder-
head-bolts completed
Zweiter Nachzug der Zylinder-
kopfschrauben erledigt
Spare part no. 51.97801−0212
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