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© 200324 3-5 Inspection and adjustment PE ENGINE FUEL SYSTEM CF65/75/85 series 4 5 3.3 INSPECTING INJECTOR OPERATION } Fuel or test fluid discharged by an injector may penetrate the skin, seriously harming your health. Make sure the fuel jet is discharged into a suitable container. Evaluating the injector's spray pattern, spray angle, and sound is practically impossible. New injectors or injectors that have been in use for some time cannot be tested in this way. 1. Place the injector on an injector tester. 2. First allow the injector to inject a number of times. 3. Inspect the injector for: - opening pressure - leakage - injector nozzles. Opening pressure Inspect the discharge pressure by slowly building up the pressure inside the injector. Leakage Dry the nozzle immediately after the final injection. 2. Increase the pressure to the opening pressure minus 20 bar. Within approx. 10 seconds, fuel must have ceased to leak from the nozzle. A moist nozzle is permitted. If the injector does not pass the oil leakage test, it must be replaced. Injector nozzles Quickly build up pressure in the injector and check whether all the nozzles are fully open. 2. Clean the injector if possible. See "Cleaning". |