Servicing, Adjusting Injection Nozzles
Servicing, adjusting injection nozzlesPreceding work:
Removing and installing injector nozzles. Service and Repair
Testing injection nozzles. Testing Injection Nozzles
Disassemble injection nozzles. To do this, clamp retaining body (51/5) in vice using protective jaws. Ensure that the leak oil lines are not damaged.
Unscrew nozzle tensioning nut (51/3)
Tightening torque: 70 - 80 Nm.
Remove nozzle needle (50/2). Perform visual and sliding check. To do this, immerse nozzle in filtered diesel fuel. When nozzle body is held upright, nozzle needle must slide down toward nozzle seat as a result of its own weight. If damaged, replace nozzle needle (50/2) and nozzle body (50/3) only as a set.
Remove combustion residues on nozzle body (50/3).
Dress intermediate disk (51/1) on dressing plate.
Remove thrust pin (51/2). Tip must face toward top part.
Remove compression spring (51/4).
Adjust ejection pressure by inserting shim (51/7).
Specification: 115 +8 bar for new or newly adjusted nozzle; at least 110 bar for used nozzle.
Ejection pressure higher or lower depending on thickness of shim, 0.02 mm corresponds to pressure difference of about 2 - 3.
Special tools
