Man D2862 LE221, Repair Manual

Page: 127 / 420

COMMON RAIL SYSTEM
Checking the injector seat, rail and leakage oil lines for leaks
(1) Leakage oil line
(2) Fuel line, leakage oil line - collector (3) Fuel line, leakage oil line - collector
(4) Leakage oil line
Technical data
Pressurisation, drip test ......................................................................................................... 3.0 - 3.5 bar
Pressure drop .......................................................................................................... 0.1 bar in 10 minutes
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 replace rail connections once they have been undone
• 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
AE6 3st edition 125