Fuel Rail: Service and Repair

13 53 158 Removing and installing/replacing high-pressure rail (N14, N18)







WARNING:
Disconnect negative battery terminal (risk of fire due to short-circuiting on removal)
Carry out installation work on fuel system only with coolant temperature below 40°C.







IMPORTANT:
Wear full face guard and protective gloves.
Fuel can emerge spontaneously at high speed when the high pressure line is released.







IMPORTANT:
Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.
Introduced contaminants can cause malfunctions in the system.
- Do not allow any dirt particles or foreign bodies to get into the system.
- Remove all traces of dirt before removing pipes or individual components.
- Use only fluff-free cloths.
- Seal all fuel system openings with protective caps or plugs.







Necessary preliminary work:
- Remove intake plenum.
- Remove pressure line.







Recycling:
Fuel escapes when fuel lines are detached.
Catch and dispose of escaping fuel.
Observe country-specific waste disposal regulations.







NOTE: For purposes of clarity, illustration shows and description refers to the removed high-pressure rail.

Disconnect plug connections (1) of fuel injectors (2).







Disconnect plug connection (1) for high-pressure sensor.
Detach wiring harness (2) from high-pressure rail (3).
Release screws.
Tightening torque 13 53 3AZ .
Detach high-pressure rail (3) from cylinder head and remove.







Installation note:
- Refer to the procedure for installing fuel injector if a fuel injector (2) detached from the cylinder head (4) while removing the high-pressure rail.
- Replace hold-down device (1).
- Replace seal ring (6) and support ring (5), making sure support ring (5) is seated correctly
- Make sure guide pin (3) of fuel injector (2) is correctly positioned in designated hole in cylinder head (4).







Assemble engine.
Check fuel system for tightness.
Check function of DME.