TM 9-2320-366-34-1
2-46
NO
YES
3.
4.
Air cleaner element
serviced by emergency
procedure.
Air inlet system OK.
Air cleaner element OK.
Fuel setting OK.
Injector timing OK.
Is valve clearance
adjustment correct?
Improper valve clearance
adjustment will cause fuel
to burn unevenly and
produce black or gray
exhaust smoke.
Air cleaner element
serviced by emergency
procedure.
Air inlet system OK.
Air cleaner element OK.
Fuel setting OK.
Injector timing OK.
Valve clearance OK.
NO
YES
Fuel Injector Test
Refer to para 3-14
Is a loud combustion
knock heard when
actuating control shaft
lever on each injector
cylinder?
Faulty fuel injector(s)
will cause fuel to burn
unevenly and produce
black or gray exhaust
smoke.
Adjust valve
clearance (para 3-14).
Replace fuel
injector(s) (para 4-2).
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
WARNING
Read WARNING
on following page.
Incorrect valve clearance.
Faulty fuel injector(s).
Faulty fuel governor.
Faulty fuel injector(s).
Faulty fuel governor.
Replace fuel governor
(para 4-9).
a9. EXCESSIVE BLACK OR GRAY EXHAUST SMOKE FROM ENGINE (CONT)
