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SERIES 55 INTERNAL HIGH PRESSURE FUEL LINE

The internal high pressure fuel line supplies fuel from the external high pressure fuel line to the injector nozzle holder assembly located inside the cylinder head. See Figure 24968 . ‪

1.Cylinder Block ‪

5.Injector Nozzle ‪

2.Cylinder Head ‪

6.Internal Injector Fuel Line ‪

3.Nozzle Hold Down Crab ‪

7.High Pressure Fuel Line ‪

4.M10 Bolt ‪

8.Electronic Unit Pump ‪

Internal High Pressure Fuel Line

Repair or Replacement of Internal High Pressure Fuel Line

To determine whether repair is possible or replacement is necessary, perform the following procedure. See Figure 26595 . ‪

Flowchart for Repair or Replacement of Internal High Pressure Fuel Line

Removal of Internal High Pressure Fuel Line

Pre-cleaning is not necessary. Remove the internal high pressure fuel line as follows: ‪

  1. Remove intake manifold. Refer to section .
  2. Remove the external high pressure fuel line. Refer to section .
  3. Remove the internal high pressure fuel line retaining nut from the cylinder head. See Figure 25959 .
  4. Remove the internal fuel line.

    1.Retaining Nut ‪

    3.Cylinder Head ‪

    2.Internal Fuel Line ‪

    Removal of Internal High Pressure Fuel Line

Inspection of Internal High Pressure Fuel Line

Inspect the internal high pressure fuel line as follows: ‪

  1. Inspect the internal high pressure fuel line for damage:
    1. Check the internal high pressure fuel line for stress cracks, gouge marks, or bends.
    2. If any damage is found, replace the internal fuel line.
  2. Inspect the internal high pressure line retaining nuts:
    1. Check for damaged threads.
    2. If these are detected, replace the nut.

Installation of Internal High Pressure Fuel Line

Install the internal high pressure fuel line as follows: See Figure 25959 . ‪

  1. Insert the internal high pressure fuel line in the cylinder head.
  2. Install internal high pressure fuel line retaining nuts.
  3. Torque retaining nut to 34-36 N m (25-27 lb ft).
  4. Install external high pressure fuel line. Refer to section .
  5. Install intake manifold. Refer to section .

    1.Retaining Nut ‪

    3.Cylinder Head ‪

    2.Internal Fuel Line ‪

    Installation of Internal High Pressure Fuel Line