Man D2862 LE221 Repair Manual page 110

COMMON RAIL SYSTEM
Pressure limiting valve .......................................... M20x1.5 ..........................................................100 Nm
High-pressure line pipe clamp mounting screw.................................................................................. 5 Nm
Important information
WARNING
The common rail system can be damaged
• All work on components of the common rail system must be performed by specially trained
personnel only
• The engine must be stationary for at least 5 minutes before commencing work in order to enable
depressurisation in the rail, or depressurisation must be checked by means of MAN-cats
(desired value 0)
• Ensure absolute cleanliness in all areas when carrying out all work
• Before working on the clean side of the fuel system, clean the engine and the engine compartment
(e.g. steam cleaner). The fuel system must be sealed during this process.
• Avoid any moisture whatsoever
• Always t new rail connections once they have been unfastened
• Do not reuse plugs for high-pressure lines, the rail or injectors, even if they have only been used
once
• Follow the sequence described when tightening injectors, high-pressure lines, the rail and rail
connections
WARNING
Danger of damage due to dirt ingress
• Always remove only one fuel line
• Plug the component connections immediately using new, clean protective sleeves
WARNING
Residual fuel may run out during removal. Danger of environmental pollution.
• Use a suitable fuel collecting container
WARNING
Component damage due to incorrectly tightened screw/bolt connections
• If impact wrenches are used, these may only be used for pretightening to max. 50% of the
specied tightening torque
• Final tightening must always be performed manually using a torque wrench
Special tools
[9]
[10]
[11]
108
End plug
• Plugging the high-pressure lines
Protective sleeve Z 14 x 15
• Plugging the high-pressure line connections
End plug
• Plugging the rail-pressure sensor bore in the rail
• Plugging the pressure limiting valve bore in the
rail
AE6 3st edition
®
81.96002-0521
81.96002-0512
81.96002-0556