Fuel system - Service procedures
Injectors, reconditioning
Opening pressure, adjusting
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1
Clean the outside of the injectors with chemically pure gasoline.
Connect the injector to an injection tester.
2 Dismantle the injectors. Pull out the nozzle needle from the nozzle sleeve, and place all parts in chemically pure gasoline. NOTE! If several injectors are cleaned at the same time make sure that the springs and adjusting washers as well as the needles and sleeves which belong together are not mixed.
3 Wash the parts in an Ultrasonic washer. Blow them dry. 2 4 Check the nozzle needle and the nozzle sleeve thoroughly.
Slowly press down the tester lever until the injector opens and releases fuel.
Inspection is carried out in an illuminated magni-
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fying glass or a diffuser microscope. If the seat is dented the nozzle needle must be replaced together with the nozzle sleeve.
Read off the opening pressure on the tester pressure gauge. 4
5 Check all other parts. Dip them in testing oil. 6 Reassemble the injector with the same thickness of adjusting washer as origin. Check opening pressure and spray pattern, see Opening pressure, adjusting on this page.
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If the reading does not agreee with the pressure stipulated by the Workshop Manual, Technical Data for each engine concerned, the setting must be altered. This is done by fitting adjusting washers. Note! No more than two washers may be used. If sufficient pressure cannot be obtained using the two thickest washers, the spring must be replaced.
