13 51 017 Removing and Installing/Replacing High-Pressure Fuel Pump

13 51 017 Removing and installing / replacing high-pressure pump (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 lines or separate components.
- Use only fluff-free cloths.
- Seal all fuel system openings with protective caps or plugs.







Necessary preliminary work:
- Remove fuel delivery line.
- Remove pressure line.







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







Removal:
Disconnect plug connection (1).
Remove screws and dispose of.
Detach high-pressure pump (2) and remove.

NOTE: Engine oil can escape when pump is detached; have a cleaning cloth ready.







Installation of high pressure pump is described separately from removal.







Installation:

Installation note:
- Clean contact surface
- Replace sealing ring (1).
- Drive unit (2) of high-pressure pump must be turned into correct position prior to installation.







Installation note:
Align drive unit of high-pressure pump with respect to groove (1) on intake camshaft.







Installation note:
Replace screws (1).
Observe following installation sequence:
1. Hand-tighten bolts (1) of high pressure pump (2) (high pressure pump must still move)
2. Hand-tighten new pressure line (3). First tighten nut (4) on high pressure rail and then tighten nut (5) on high pressure pump
3. Tighten high pressure pump
Tightening torque 13 51 1AZ .
4. Tighten pressure line (3).
Tightening torque 13 53 1AZ.







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