TM 5-3805-280-24-2
Fuel System Operation and Tests
DIAGNOSE FUEL INJECTION NOZZLE MALFUNCTIONS
115
80
Fuel injection nozzles are usually removed and tested
or replaced when there is a noticeable loss of power or
excessive smoking.
Listed in the following chart are various malfunctions
which may occur on the 9.5 mm nozzles. Only
possible defects related to these nozzles are listed.
Failures in other components of the fuel injection
system are listed under their respective headings in
this group.
Refer to Group 35 for repair information.
Symptom
Problem
Solution
Engine Has Low Horsepower
Nozzle orifices plugged.
Repair. (See Group 35.)
Incorrect nozzle valve opening
Adjust. (See Group 35.)
pressure.
Broken, worn or damaged parts:
Repair as required. (See Group 35.)
Broken nozzle valve spring
Cracked or split nozzle tip
Cracked or split nozzle body
Internal leak
Wrong nozzle assembly installed.
Install correct nozzle assembly. (See
Group 35.)
Nozzle loose in cylinder head.
Make sure nozzle assembly is
correctly installed. Tighten clamp cap
screw to specified torque. (See
Group 35.)
Engine Emits Too Much Smoke
Nozzle orifices plugged.
Repair. (See Group 35.)
Continued on next page
RG,115,JW7680
1924NOV971/2
13-607
