PROCEDURE
1 Make sure that the test bench (001, Figure 7-77) is clean.
2 Make sure that the receiver (004) is removed from the valve holder (005).
3 Use a brass wire brush to remove combustion particles from the external areas of the
nozzle.
4 Attach the pilot injection valve (003) to the valve holder (005) with the spring cages and
their Allen screws. Make sure that the pilot injection valve points down.
5 Attach the HP hose to the connecting piece (002).
6 Connect the electrical connection to the test bench.
7 Start the test bench in accordance with the manufacturer’s instructions.
8 Set the pressure of the test bench to 500 bar.
9 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.
10 Push the INJECT button. Make sure that pilot injection valve operates correctly.
11 Do a check of the seating surface between the needle seat and the nozzle as follows:
11.1 Keep the pressure of the test bench constant at approximately 350 bar.
11.2 Monitor the pilot injection valve for 30 seconds. No fuel must come out of the
nozzle.
12 Do a check of the opening pressure as follows:
12.1 Set the pressure to 280 bar, then push the INJECT button. No fuel must come
out of the nozzle.
12.2 Set the pressure to 400 bar, then push the INJECT button. Fuel must come out
of the nozzle as a spray.
13 For the correct function and to use a pilot injection valve again, read the data below:
•
The pressure to operate the pilot injection valve is between 300 bar and 400 bar,
refer to the check given above.
•
Most of the fuel will come out as a spray from the holes in the nozzle tip at the
specified opening pressure.
•
At the end of an injection, no fuel must come out of the nozzle.
X72DF
AA00-2790-00AAA-362A-A
Maintenance Manual Pilot injection valve - do a functional test
Winterthur Gas & Diesel Ltd.
- 338 - Issue 002 2020-10
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