Torque guide values
152
Tightening the cylinder-head bolts on a new engine
(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, tighten the
cylinder-head bolts 1 to 4 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 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.
First retightening of cylinder-
head-bolts completed
Erster Nachzug der Zylinder-
kopfschrauben erledigt
Spare part no. 51.97801-0211
Intake side / injection nozzle
MAN
1
2
4
3
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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