Valtra VALMET 6000 Service Manual - page 11
114
Model
Code
Page
22. Fuel system
1. 9. 1992
6000--8750
223
6
Tightness of nozzle
Press down the tester pump lever until the pressure rises to
approx. 20 bar below the adjusting value. Maintain this pres-
sure for approximately 10 seconds and check whether drops
of fuel are formed on the point of the nozzle. If the injector
leaks, it should be cleaned or the nozzle should be changed.
I. Reconditioning injectors
1. Secure the injector in a suitable way.
2. Unscrew the nozzle cap nut. Remove the nozzle and the
parts inside the holder.
3. Clean the nozzle in cleaning fluid both inside and outside.
4. Clean the nozzle holes with a needle (including in cleaning
set 8360 83288).
5. Test the movement of the nozzle valve as follows:
Rinse the parts thoroughly in fuel or testing fluid. Pull the valve
out of the nozzle body to 1/3rd of its length. If the fit is correct,
the valve should be able to slide down in the nozzle body
under its own weight. Turn the valve slightly and repeat the
test. Should the nozzle valve bind slightly, it should be
changed.
1
2
3
4
5
6
7
8
9
Injector
1. Fuel inlet
6. Nozzle body
2. Leak---off fuel
7. Pressure chamber
3. Shims
8. Nozzle valve
4. Pressure spring
9. Nozzle hole
5. Valve stop spacer
6. Before assembling, all parts should be carefully cleaned in
clean fuel or testing fluid.
7. Put the same number of shims back as were fitted earlier.
Note possible adjustment of the opening pressure. Assemble
the rest of the injector. Note the position of the spring guide
and the valve stop spacer.
8. Tighten the nozzle cap nut by hand and then to
60 Nm
.