Fuel Rail: Service and Repair

Replacing Complete Injection Pipe (M54)

Necessary Preliminary Tasks:
- Switch off ignition
- Remove cover for fuel injectors.


Caution!
Mark plug connections (1) of oxygen monitor sensors for cylinder banks 1-3 and 4-6 to prevent them from being mixed up when they are installed later.






Unclip plug connections (1) from holders and disconnect.

When replacing injection pipe:
Remove both holders for plug connections (1) from injection pipe.

Disconnect plug connection of intake air temperature sensor (2).

Disconnect plug connection (3) on solenoid valve of VANOS adjustment unit.

Detach terminal strip (4) for fuel injectors from injection pipe.

Recycling
Fuel in fuel lines is under pressure (approx. 3-5 bar). Fuel escapes when fuel lines are detached. Catch and dispose of escaping fuel.
Observe country-specific waste disposal regulations.

E53 and E46 Only
Remove heater bulkhead.

Z3 Only:
Remove strip for battery positive lead and engine wiring harness from bulkhead.

Z3, E85, E39, E46 and E53:
NOTE:
For a better overview, this work step is shown on an engine that has been removed.






Unclip fuel line (1) from holder (2).

Follow instructions for unlocking fuel line.

Unlock fuel line (1) from cylinder head at rear.






Release screws (1) and remove injection pipe with fuel injectors.

Installation:
- Coat sealing ringes of fuel injectors with anti-seize agent to facilitate fittin gof injection pipe.