WinGD RT-flex50DF, Maintenance Manual, Page: 193 / 586

Maintenance
2722 − 2/A1
Winterthur Gas & Diesel Ltd.
3/ 7
3. Procedure
3.1 Checks
WARNING
Injury Hazard: Do not put your fingers near the holes in the nozzle
tip. Fuel can go through your skin and cause injury or kill you.
1) Start the test bench (94272).
2) At regular intervals, use a master pressure gauge to do checks of the pressure
gauges on the test bench. If necessary, adjust the pressure gauges.
3) Set the pressure of the test bench (94272) to 200 bar.
4) Push the INJECT button. Make sure that the injection valve (1) operates
correctly.
5) Do a check of the seating surface between the needle seat and nozzle as
follows:
a) Keep the pressure in the test bench (94272) constant at approximately 400 bar.
b) Monitor the injection valve for 30 seconds. No fuel must come out of the nozzle.
6) Do a check of the opening pressure as follows:
a) Set the pressure to 350 bar, then push the INJECT button. No fuel must come
out of the nozzle
b) Set the pressure to 450 bar, then push the INJECT button. Make sure that fuel
comes out of the nozzle as a spray.
3.2 Results
1) For the correct operation and to use an injection valve again, read the data
below:
D The pressure to operate the injection valve is between 200 bar and 300 bar, refer
to the test above.
D For used injection valves, a pressure decrease of 30 bar is permitted.
D Most of the fuel will come out as a spray from the top set of holes in the nozzle tip
at the specified pressure.
D At the end of an injection, no fuel must come out of the nozzle.
2) If the injection valve does not function satisfactorily, disassemble as given in
paragraph 3.3 .
3) Release the pressure in the test bench (94272) and the HP hose (94275A).
You must replace nozzle tips when the holes have become worn. It is not
recommended but possible to replace the nozzle tip with the needle installed. If you
replace the nozzle tip with the needle installed, do the procedure carefully.
Only the injection valve manufacturer (or an authorized company) is permitted to
repair or replace nozzle holders, intermediate plates and nozzle bodies that have
unsatisfactory sealing surfaces.
2016
Injection Valve: Disassemble, Checks, Assemble