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7
INJECTORS
4. Remove injector nozzles, Fig. 13.
a. Discard injector gaskets.
NOTE: Handle injectors with extreme care. Do
not drop!
Always use new fuel return line and injector nozzle
gaskets when servicing fuel system.
Fig. 13 – Removing Injectors
Checking Injectors
Fuel injector nozzle testing requires highly specialized equipment and procedures. Consult the Yellow Pages under
Engines-Diesel-Fuel Injection Service & Parts for the nearest diesel fuel injection specialist.
The procedures and specifications listed are provided as an aid to the fuel injection specialist when testing injector
nozzles.
1. With injector installed on a nozzle tester, operate
the handle rapidly several times to clean off any
carbon deposits on the injector port, Fig. 14.
2. Check ‘‘pop off” pressure of injector.
Specification: 135 – 145 Bar
(1955 – 2100 psi)
Fig. 14 – Checking Injector
If injector is not within specification, the injector shim
may be changed, Fig. 15.
Replacement shims are available in .025 mm incre-
ments from .7 to 1.95 mm.
NOTE: As the shim thickness increases or de-
creases by .025 mm, injection pressure
will vary about 5 Bar (71 psi).
Torque nozzle holder and injector body to 47.0 Nm
(35 ft. lbs.).
Fig. 15 – Injector Shim
SHIM
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