Disassembling injectors (Mercedes-Benz E-Class W210)

When disassembling, pay attention to the adjusting washers, which set the same injection pressure for stable engine operation. This adjustment complicates the repair somewhat, since, despite the simplicity of installing the sprayer body and needle, the pressure setting requires special control in a workshop or Bosch service. Only in case of extreme necessity, to drive a few kilometers, can you neglect the adjustment of the injection pressure after replacing the needle and sprayer body.

Sequence of works

1. To disassemble the nozzle, clamp it by the upper hexagon in a vice, being careful not to damage the drain pipe fittings. Use a wrench to unscrew the nozzle parts from each other.





2. Using a brass brush, carefully clean the carbon deposits from body 2 (Fig. 4.81) and needle 3 of the sprayer.

3. Check the tightness of the needle fit: if you place the atomizer body in purified fuel, the needle, under the action of its own weight, should fit tightly into place.

4. After the injector has been correctly assembled, tighten it into the cylinder head with a torque of 70–80 Nm.