FUEL INJECTION NOZZLE INSPECTION


  1. INSPECT NOZZLE ASSEMBLY


    1. A01KENHE01
      Text in Illustration
      *a One third of its length
      *b About 60 °

      Wash the nozzle in clean diesel fuel.

      Tech Tips

      Do not touch the nozzle mating surfaces with your fingers.

    2. Tilt the nozzle body about 60 degrees and pull the needle out about one third of its length.

    3. A01KH7O

      When released, the needle should sink down into the body vent smoothly by its own weight.

    4. Repeat this test, rotating the needle slightly each time.

      If the needle does not sink freely, replace the nozzle assembly.

  2. INSPECT OILTIGHT


    1. A01KI49E01
      Text in Illustration
      *a Good
      *b Faulty

      Check the leakage.


      1. While maintaining pressure at about 981 to 1.961 kPa (10 to 20 kgf*cm2, 142 to 284 psi) below opening pressure (adjust by tester handle), check that there is no dripping for 10 seconds from the injection hole or around the retaining nut.

        If there nozzle drips within 10 seconds, replace or clean and overhaul the nozzle assembly.

    2. A01KFS2E01
      Text in Illustration
      *a Good
      *b Faulty

      Check the spray pattern.


      1. The injection nozzle should shudder at a certain pumping speed between 15 to 60 times (old nozzle) or 30 to 60 times (new nozzle) per minute.

      2. Check the spray pattern during shuddering.

        If the spray pattern in not correct during shuddering, the nozzle must be replaced or cleaned.