DAF CF65 Series Service Manual page 267

4
CF65/75/85 series
3.3 INSPECTING INJECTOR OPERATION
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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
1. Inspect the discharge pressure by slowly
building up the pressure inside the injector.
Leakage
1. 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
1. Quickly build up pressure in the injector and
check whether all the nozzles are fully open.
2. Clean the injector if possible. See
"Cleaning".
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200324
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XE ENGINE FUEL SYSTEM
Inspection and adjustment
8
3-5