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Removing and installing fuel pressure senderG247 > < Checking fuel pressure regulating valveN276

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Removing and installing fuel pressure regulating valveN276
Removing and installing fuel pressure regulating valve -N276-
t  Removing → Anchor
t  Installing → Anchor
Special tools and workshop equipment required
t  Torque wrench
t  Open-end spanner insert, 30 mm
t  Fork spanner SW 33
   
Fuel pressure regulating valve -N276--2- is located in the high-pressure reservoir. It maintains constant pressure in the high-pressure reservoir and injection lines (fuel high-pressure circuit).
If the pressure in the high-pressure fuel circuit is too high, the regulating valve opens to allow some of the fuel to flow from the high-pressure reservoir to the fuel tank via a return line.
If the pressure in the high-pressure fuel circuit is too low, the fuel pressure regulating valve -N276- closes and seals off the high-pressure section of the system from the low-pressure section.
  Note
The fuel pressure regulating valve -N276- cannot be re-used.
Removing
  WARNING
t  Always observe rules for cleanliness and instructions when working on fuel system → Chapter.
t  Follow these instructions and rules for cleanliness before starting work and while working on the fuel system.
  A23-10264
–  Disconnect the engine cover-arrow-.
–  Remove the high pressure reservoir (rail element) → Chapter.
–  Before disassembling clean the area of the thread around the regulation valve for fuel pressure -N276- (for e.g. with a commercial cleaning agent). No dirt should enter in the opening of the high-pressure reservoir (common rail).
  Note
Proceed carefully. The cleaning agent should not enter in the connection.
–  Dry fuel pressure regulating valve -N276-.
–  Open cable tie securing wiring harness located above fuel pressure regulating valve -N276-.
–  Detach electrical connector at fuel pressure regulating valve -N276-.
–  Slacken union nut (counterhold at hexagonal flats on housing). Then unscrew and remove by hand.
–  Suction out the dirt from the opening of the high pressure tank (thread and sealing surface). Do not use metal tools, etc.
  Note
Seal off the opening of the high-pressure reservoir in opening immediately using a suitable plug to prevent dirt from entering.
Installing
  Note
t  The regulation valve for fuel pressure -N276- has no sealing, but a deformable metal seal and can therefore not be reused.
t  Note damage of the sealing surfaces (bite-edge sealing) and thread of the newregulation valve for fuel pressure -N276-.
t  Check sealing surface on the borehole of the high-pressure reservoir.
t  The thread of the regulation valve for fuel pressure -N276- should not show any oil or grease remains.
–  Tighten the locking nut manually.
–  Align new regulating valve so that the connecting line is free of tension after connector is attached.
–  Hold the housing of the regulation valve with a fork spanner and a clamp (for e.g. clamp for water pump) on the hexagon in this position.
–  Use suitable torque wrench with an open-end spanner insert (30 mm) to tighten union nut.
t  Tightening torque: → Chapter
–  After installation, run engine at moderate speed for several minutes and then switch off.
–  Ensure that the fuel system is completely sealed.
–  Interrogate the event memory.
–  Then carry out a test drive with at least one full-power acceleration. Then check high-pressure part of fuel system again for leakage.
–  Request the event memory again.
  E10-10060

Removing and installing fuel pressure senderG247 > < Checking fuel pressure regulating valveN276