TP-6137 5/0322 Section 5 Fuel System
Injector Adjustment
1. If, during the injector pressure test, the pressure
values are not correct, replace the shims in the
injector.
a. Unscrew the injector nut.
b. Remove the nozzle assembly, pressure piece,
spring seat’s conical stop, spring, and shims.
SeeFigure5-7.
Note: A change of 0.1 mm (.004 in.) shim size can
modify the pressure value of the injector of
10 bar (145 psi). The thicker shim increases
the pressure value of the injector while the
thinner shim decreases the pressure value
of the injector. Add or remove shims to
obtain the correct pressure value.
1. Injector nut
2. Nozzle assembly
3. Pressure piece
4. Spring seat’s conical stop
5. Spring
1
2
3
5
4
Figure 5-7 Injector Components
Injector Overhaul
1. Inspect the injector assembly to ensure that the
nozzle’s needle is in the hole of the pressure piece.
2. If the nozzle leaks or does not atomize, replace the
entire nozzle.
3. Lapping of the nozzle needle is not recommended.
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