Man D 2842 LE 620 Repair Manual page 162

Retightening the cylinder−head bolts following a repair
(engine cold)
Before inserting the cylinder−head bolts, apply
engine oil to the thread (not the threaded hole)
and coat the seating surface of the bolt head with
installation paste "Optimoly White T". Do not use
oils or oil additives containing MoS
are to be tightened using the rotation angle me-
thod according to tightening schedule "2" as fol-
lows.
D 1rd pretightening
D 2rd pretightening
D 3rd pretightening
D 4th pretightening
D Final tightening
Set the valve clearance.
Retightening the cylinder−head bolts following a repair
(Engine cold or warm)
After the first 10 to 20 hours of operation, following a repair, tighten the cylinder−head bolts in the order
specified in the tightening schedule "1" by 90° (2/4 turn).
The cylinder−head bolts to be retightened must not be loosened; they are to be tightened further from
their current position by 90° (1/4 turn).
Attach the sticker "First retightening of cylinder−head bolts ..." (remove sticker that might already be
attached).
After the first 400 hours of operation, following a repair, tighten cylinder−head bolts in the order specified
in the tightening schedule "1" by another 90° (1/4 turn).
Attach sticker "Second retightening of cylinder−head bolts ...".
Note:
When the head has been removed, the cylinder head gasket must always be replaced.
Torque guide values
. The bolts
2
= to 10 Nm
= to 80 Nm
= to 150 Nm
= 90°
= 90°
160
Intake side
6
1
3
5
Exhaust side
Tightening schedule "2"
4
2