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Removing and installing the injection unit > < Fuel system, engine side

Yeti

Removing
Removing
  Note
t  Observe safety measures when working on the fuel system → Chapter.
t  Observe rules for cleanliness → Chapter.
–  Remove engine cover → Chapter.
–  Take out the noise insulation at the injection units.
  Caution
t  Mark the assignment of the injection units to the cylinders. They must only be re-used on the same cylinder.
t  Immediately close the open connections with suitable caps.
   
–  Disconnect the plug -1- at the injection units to be removed.
  N23-10199
–  Hold the connection on the pegs, pull up the unlocking bolt in -direction of arrow- and detach the connection of the fuel return-flow line from the injection unit to be removed.
  Note
  N15-10404
t  If the unlocking bolt of the connection for the fuel return-flow line cannot be pulled up by hand, slacken the bolt by turning it with a narrow screwdriver -arrows-.
t  Pay attention to cleanliness, no impurities must get into the open return lines and into the connections of the injection units.
  Caution
When slackening the union nuts for the high pressure lines, counterhold the connection fitting with a lateral wrench. If the connection fitting loosens, this can cause leakage.
–  Unscrew the high pressure line between the high pressure reservoir (rail) and the injection units to be removed.
–  Unscrew the screws for the cover of the injection units to be removed.
–  Slightly raise the covers and turn by 90° in order to unscrew the nuts for the clamping claws of the injection units to be removed.
  Caution
When screwing the nuts for the clamping claws of the injection units, there is a risk that the nut falls into the cylinder head. Thus work very carefully in order to avoid unnecessary installation work or possible consequential damage.
–  Unscrew nuts for clamping claw of corresponding injection unit.
  A23-10214
–  Insert extractor -T10055- with adapter -T10055/1-, as shown in the illustration, and pull out the injection unit upwards by way of tapping.
  N23-10229

Removing and installing the injection unit > < Fuel system, engine side