Checking and repairing fuel injectors Disassembling fuel injectors Fig. 3 Insert injector assembly (the inlet orifice facing downwards) into the clamping device and hold in a vice. Remove union nut and take out nozzle body, inter- mediate washer, pressure pin, compression spring and shim. Take pressure pipe neck out of holder. 3 Repairing fuel injectors Fig. 4 Clean interior of injection body (1) with a small wooden stick and petrol or Diesel fuel. Clean nozzle needle (2) with a clean cloth. Clean coked nozzle needle surface on lathe with a piece of wood (not too hard) dipped into oil. 1 Note: To prevent corrosion, do not touch lapped faces of nozzle needle with the fingers.
The needle and injection nozzle are matched to each other and must not be interchanged. 2 4 Check cleaned parts for wear and damage, replac- ing them if necessary. De-grease new parts. Assembling fuel injectors Fig. 5 Insert pressure pipe neck into clamping device. Insert shim and compression spring. 5 Fig. 6 Check intermediate piece for wear. Insert pressure pin and intermediate washer. 6 34