Instructions of Diesel Injector Nozzle Tester
Instructions of Diesel Injector Nozzle Tester
Tests opening pressure, leakage and spray pattern.
Enables the testing of injectors under pressure. Gauge reads both PSI and Bar.
Transparent plastic reservoir includes filter. Supplied with two connecting pipes, M12 1.5 and M14 1.5. 89mm gauge (0 – 8700psi, 0 – 600 Bar).
Suitable for pressure-activated injectors. With the addition of an electronic switching device (not supplied) it can be used for testing common-rail type injectors
Instructions
Note: Before using the tester, make sure you have read and understood the safety precautions below. We recommend that the tester is bolted down to the workbench for ease of use and safety.
1. Depressurise the vehicle’s fuel system as described in the manufacturer’s technical service documentation. For example, on some vehicles this involves deactivating the electric fuel pump(s) and running the engine until it stops. Be aware that there may be more than one pump.
2. Remove the injector(s) to be tested, following the procedure in the manufacturer’s technical service documentation.
3. Fill the tester’s reservoir with an appropriate diesel injector test fluid such as Shell V-Oel or Castrol Calibration Oiland replace the lid.
4. During testing, fluid will be sprayed from the injector, therefore have a suitable receptacle placed to capture the spray. Do not point the nozzle of the injector towards yourself or anyone else.
5. Pumping the lever on the tester will build up pressure to the injector. Once some pressure has built up, check to see if the pressure drops, or there are obvious leaks. There could be a leak between the supplied pipe and the injector or tester. Check and tighten the connections as necessary. If there is still a pressure drop after checking and tightening the connections, the injector nozzle may be leaking.
6. Continue to pump the lever and observe the pressure at which the injector nozzle opens; compare this to the figure detailed in the manufacturer’s technical service documentation.
7. Upon nozzle opening, compare the spray pattern/atomisation to the manufacturer’s described correct spray pattern.
8. If required, carry out any repairs or remedial work to the injector as detailed in the manufacturer’s technical service documentation, before re-testing. Note: when disconnection the injector, be aware that care needs to be taken to depressurise.
Testing Different Types of Equipment
The DNT Tester can be used for testing other sorts of equipment, where high pressure is required. Always follow the equipment manufacturer’s recommendations and safety instructions
Precautions
• Eye and hand protection must be worn while operating the tester.
• Refer to the manufacturer’s technical service documentation before starting the testing procedure and pay particular care to the depressurisation procedure.
• Seal fuel line pipes and fittings when disconnecting fuel lines. Avoid contact with fuel.
• Clean up fuel spills immediately and dispose of all soiled rags as per local authority guidelines.
• Do not place yourself or another person in a position in line with the injector being tested. Very high pressures are involved which could potentially cause serious injury.