TM 5-6115-400-12
Table 3-3. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
c. Fuel injection nozzles not
c.
Replace nozzles (para 3-3).
operating properly.
d. Fuel transfer pump not op-
d. Replace fuel transfer pump
erating properly.
e. Air in fuel system.
e. Correct air leaks in suction
side of fuel system. Vent fuel sys-
ten (para 3-1).
f.
Insufficient air supply to
f.
Clean air system (para 3-8).
cylinders.
g. Fuel injection pump improp-
g. Time fuel injection pump
erly timed.
h. Valve lash incorrect
h. Adjust valve lash (para
3.
Engine stops
a.
Out of fuel
a. Fill fuel tank with specified
fuel and vent the fuel system
b.
Restricted fuel supply.
b. Check fuel system (para
c.
Broken or loose fuel lines.
c. Correct or replace affected
parts,
d. Fuel transfer pump or fuel
d. Replace inoperative pump
injection pump inoperative
(para 3-32 or 3-34).
e. Low oil pressure.
e. Check oil level. If satisfac-
tory, adjust oil pressure regu-
lating valve (para 3-27)
f.
High coolant temperature.
f.
Refer to paragraph 3-42.
g.
Shutdown switch defective
g. Replace switch (para 3-56).
4.
Engine overheats
a.
Leak in cooling system
a. Correct all leaks and fill
cooling system.
b.
Radiator core clogged
b. Clean and flush radiator
c.
Radiator air passages clog-
c. Remove debris from radiator
ged.
core
d.
Fan drive belts too loose.
d. Adjust fan drive belts to
proper tension (para 3-11).
e.
Thermostats inoperative.
e. Test the thermostats for
proper operation (para 3-47).
f.
Engine oil cooler clogged
f.
Clean or replace the oil cooler
core (para 3-28).
g.
Improper engine lubrication.
g. Check for proper oil pressure.
Refer to higher echelon
h.
Water pump malfunctioning.
h. Repair or replace the water
pump (para 3-48).
i.
Fuel injection pump im-
i.
Time fuel injection pump
properly timed.
5.
Engine shows loss of power
a. Insufficient supply of air to
a. Clean system (para 3-8).
cylinders.
b. Insufficient supply of fuel
b. Check fuel system (para
to fuel injection nozzles.
3-29).
c. Air in fuel system.
c. Vent fuel system. Check for
air leaks on suction side of fuel
transfer pump (para 3-34).
d.
Clogged fuel filters.
d. Change filter element (para
e.
Improper valve lash.
e. Adjust valve lash (para
3-22) .
f.
Fuel injection pump im-
f.
Time fuel injection pump
properly timed.
3-13
