Pressure testing of fuel injection valve:
The most effective checking of the fuel valves is obtained through pressure testing, preferably
carried out after each overhaul and also in case of irregularities in operation. The pressure testing
is carried out in the following way by means of the pressure testing apparatus supplied.
Mount the fuel injection valve in the bracket .The bracket to be in such a position that the nozzle of
the injector is pointing downwards.
For test of the injection pressure and atomizing mount the test pipe, increase pressure by means of
the lever on the test pump, and adjust the opening pressure to 320 bar (8 holes nozzle)/350 bar (10
holes nozzle), by the adjusting screw (D), then tighten lock nut (B) and check opening pressure again.
Do not expect chattering, but make sure that the nozzle spray from all holes in the same angle. The
nozzle might chatter if the lever is worked very fast, actually by hitting it. Do not expect a nozzle tip with more than 1000 running hours to perform like a new nozzle in the test pump.
Then increase the pressure to 300 bar and keep the pressure by working the lever slowly downwards.
When the pressure is kept at 300 bar, there should be no more than one drip from the nozzle tip for
approx. 3-5 sec.
WARNING: Keep out of the fuel jets as they will penetrate the skin. Fuel which has penetrated
the skin can cause painful inflammations (blood poisoning).
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