Torque guide values
174
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 en-
gines, 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 to 1 4 hours of operation, fol-
lowing a repair, tighten the cylinder−head bolts in
the order specified in the tightening schedule “1”
by 90° (1/4 turn).
The two outer bolts (intake and exhaust side)
must not be retightened.
Note:
The cylinder−head bolts to be retigh-
tened 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 / injection nozzle
1
3
4
2
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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