Check The Injectors - Nanni T4.155 Workshop Manual

60300140( )
indice A
b. remove the carbon deposits accumulated at the end of
the injector needle valve with the bar
c. Use a brass bristle brush to remove the carbon
deposits from the external parts of the injector nozzle
(without touching the lapped surface).
d. Verify the degree of corrosion or burning on the injector
body.
e. Check whether the injector needle valve is damaged
and corroded. Replace complete injector when any one
of the parts has the slightest defect.

CHECK THE INJECTORS

a. Carefully clean the injector in fresh diesel fuel.
ADVICE:
Never touch the assembly surfaces of the injector with your
fingers.
b. Incline the body of the injector approximately 60° and pull
out the injector needle valve approximately one third.
c. Release the injector needle valve and check that it falls
back normally in the injector body under its own weight.
d. Repeat this test turning the injector needle valve a little
each time. If the injector needle valve does not fall back
into a given position, replace the complete injector
4 CYLINDERS WORKSHOP MANUAL 127/191