13 51 017 Removing and installing/replacing high pressure pump (N20 hybrid drive)
Compliance with the following points is mandatory before beginning work:
- Observe the SAFETY INFORMATION for working with electric vehicles.
Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short-circuiting on dismantling).
Electric fuel pump starts up automatically when door is opened!
Carry out installation work on fuel system only with coolant temperature below 40°C.
Attention!
Wear full face guard and protective gloves.
Fuel can emerge spontaneously at high speed when the high pressure line is released!
Attention!
Adhere to conditions of absolute cleanliness when carrying out repair work 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 contamination before removing lines or separate components.
- Use only lint-free cloths.
- Seal all fuel system openings with protective caps or plugs.
Attention!
Ignition coils must not be contaminated by fuel.
The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!
Recycling:
Fuel escapes when fuel lines are detached.
Catch and dispose of escaping fuel.
Observe country-specific waste disposal regulations.
Necessary preliminary tasks:
- Remove ACOUSTIC COVER
- Remove IGNITION COILS .
- Remove PRESSURE LINE between high pressure pump and rail.
- Release FEED LINE at high pressure pump, do not remove.
Removal:
Feed out and remove sound insulation (1).
Unlock connector (1) and pull off.
Unfasten screws (2).
Attention!
Pump plunger can fall out when high-pressure pump (3) is pulled out!
Lift out high pressure pump (3).
Engine oil can escape when pump is detached; have a cleaning cloth ready.
Necessary preliminary work
Lay depth gauge (1) flat on high pressure pump flange.
Turn engine at central bolt in direction of engine rotation until the depth gauge shows that the camshaft has reached the BDC position .
Before the high pressure pump is installed, the cam of the high pressure pump drive must be turned to bottom dead center . To do this, twist the engine if necessary in the direction of engine rotation to the central bolt of the crankshaft.
Preparation for installation:
Replace gasket (1).
Clean contact surfaces at high pressure pump.
Installation:
Installation note:
Adhere to tightening/torque sequence.
Install high pressure pump (3).
Replace screws (2). Screws (2) are coated with sealing compound.
Provisionally fasten screws (2) of the high pressure pump (3) and tighten alternately in 90° increments until final torque, piston can otherwise break due to tilting!
Tightening torque 13 51 1AZ .
Attach and lock connector (1).
Connector (1) must engage audibly.
Refit sound insulation (1) at the high pressure pump.
Required reworking:
- Install the PRESSURE LINE between the high pressure pump and rail.
- Install the FEED LINE on the high pressure pump.
- Install IGNITION COILS .
- Install ACOUSTIC COVER .
- Check fuel system for leaks.