Man D 2842 LE 620, Repair Manual

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Removing and installing the high-pressure lines
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Danger:
Before starting the work, comply with “Special instructions when working on the common rail sys-
tem” (see page 9).
Caution:
All connections and removed parts are to be closed immediately with suitable caps!
Dirt in the injection system causes:
D
injectors to jam
D
the high-pressure pump drive to break
The lines contain fuel.
Catch escaping fuel in a suitable container.
Fig. 1
Unscrew the union nuts
À
of the high-pressure
lines between the rail and high-pressure pump.
Fig. 2
Unscrew the union nuts
Á
of the high-pressure
lines between the rail and injectors.
The lines are installed in reverse order.
Danger:
High-pressure lines with WAF 17 union
nuts must be replaced !
High-pressure lines with WAF 19 union
nuts may be reused !
Injection lines must be fitted without ten-
sion.
Tightening torques for high-pressure lines:
Initial fit:
Pretightening 10 Nm
Final tightening 60 °
Reuse:
Pretightening 10 Nm
Final tightening 30 °
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