Fuel Rail: Service and Repair

Replacing complete injection pipe (M54)


Turn off ignition.







Remove cover from 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 fuel rail:
remove holder for plug connections (1) from fuel rail.
Disconnect plug connection of intake air temperature sensor (2).
Disconnect plug connection (3) on solenoid valve of VANOS adjustment unit.
Detach connector 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 cable strip for battery positive lead and wiring harness-engine from bulkhead.







Z3, 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) at rear of cylinder head.







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

Installation:
Coat sealing rings of fuel injectors with anti-friction agent to facilitate installation of the fuel injector block.