WinGD RT-flex50DF, Maintenance Manual, Page: 233 / 586

Maintenance
2790 − 1/A1
Winterthur Gas & Diesel Ltd.
5/ 7
10) Push the INJECT button. The pilot injection valve must operate correctly.
11) Do a check of the seating surface between the needle seat and the nozzle as
follows:
a) Keep the pressure of the test bench constant at approximately 350 bar.
b) 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:
a) Set the pressure to 280 bar, then push the INJECT button. No fuel must come
out of the nozzle.
b) Set the pressure to 400 bar, then push the INJECT button. Fuel must come out
of the nozzle as a spray.
6. Results
1) For the correct function and to use a pilot injection valve again, read the data
below:
D The pressure to operate the pilot injection valve is between 300 bar and 400 bar,
refer to the check given in paragraph 5 . The pressure to operate a new pilot
injection valve is approximately 350 bar.
D
Most of the fuel will come out as a spray from the holes in the nozzle tip at the
specified opening pressure.
D At the end of an injection, no fuel must come out of the nozzle.
7. Holder
1) Remove the six Allen screws (1, Fig. 5 )
from the holder (2).
2) Remove the holder (2), together with
the prechamber (4).
3) Make sure that the seals (5, 6) are
serviceable. If the seals are
unserviceable, do step a ) to step e )
a) Remove the bottom part of the
prechamber (7) from the top part.
b) Remove the seals (5, 6).
c) Attach a new seal (5) to the
prechamber (4).
d) Attach the bottom part of the
prechamber (7) to the the top part.
e) Use the assembly tool (94289E)
to attach the new seal (6) to the
prechamber (4).
4) Apply NeverSeez NSBT 8 to the
threads and surfaces that touch of the
six Allen screws (1).
5) Attach the holder (2) to the cylinder
cover with the six Allen screws (1).
6) Torque the six Allen screws (1) to
80 Nm.
2018 − 02
Pilot Injection Valve: Removal, Disassembly, Check, Assemble, Installation
I
1
2
I
1
2
Fig. 5
4
5
6
7
3
94289E
94289E
3.5 mm
4
6