Workshop Manual S3.8 Engine A030K288 (Issue 2) 01-2010 thicker shims). When testing nozzle, never put your hand under the jet of a spraying nozzle. The jet will penetrate into the skin which is dangerous. 2. CHECK NOZZLE FOR LEAKAGE Push nozzle tester lever down slowly until needle on pressure gauge shows 20 kg/cm’ below opening pressure. The nozzle is leak proof if no drop comes out of nozzle tip within 10 seconds. In the event of leak, disassemble injection nozzle and clean as per procedure. If the leak could not be repaired by careful cleaning of seats or nozzle body and nozzle needle, replace nozzle.
(When testing injectors with the pressure gauge in circuit, operate nozzle tester lever slowly as otherwise gauge may get damaged.) Fig. 21 3. CHECKING NOZZLE SPRAY (Fig. 22) Cut off the pressure gauge from the circuit by closing shut off valve. Move pump lever up and down approx. 4 to 5 times per second. The nozzle will then buzz very softly. Atomization is satisfactory when the 4 jet cones have uniform closed contours and are finely atomized. There should be no lateral streams. The presence of small non-buzzing ranges with non-atomized cones is of no significance. The test oil will emerge in the shape of a non-atomized cone until the buzzing range is attained. 22 Fig.
DISASSEMBLY,REPAIRANDASSEMBLYOF NOZZLE HOLDER AND INJECTION NOZZLE Fig. 23 (Nozzle holder removed) 1 Insert nozzle holder in to holder 403 589 00 31 00 and unscrew pressure nut with special wrench 000 589 01 13 00 from nozzle body. Fig. 23. 2 Clean nozzle externally and internally in diesel fuel, particularly the middle seat and the ring groove by means of a small piece of wood. Clean injection holes of nozzle body with a cleaning needle from special tool 000 589 00 68 00. Fig. 24. Fig. 24 35