Section V. TROUBLESHOOTING
45. Engine lacks Power
41. General
This section provides information useful in
Probable cause
Possible remedy
Restricted fuel supply or air Clean lines, service filters,
diagnosing and correcting operation or failure
in fuel system.
and bleed system (para
of the air compressor and its components. Each
36).
trouble symptom stated is followed by a list
Restriction in air intake -- Service air cleaner (para
of probable causes of the trouble. The possible
39).
remedy recommended is described opposite the
Faulty fuel injector -------- Report to direct support
maintenance.
probable cause. Any trouble beyond the scope
Faulty injector pump ------ Report to direct support
of organization maintenance shall be reported
maintenance.
to direct support maintenance.
46. Engine Overheats
Probable cause
Possible remedy
Probable cause
Possible remedy
Low coolant level ---------- Add coolant.
Battery discharged ----------------------------- Test battery (para 69).
Fan belts slipping -------- Adjust fan belt tension
Replace battery (fig. 15).
(para 38a) or apply
Faulty starter or switch --- Replace starter (para 65)
graphite belt dressing.
or switch (para 68).
Thermostat inoperative ----- Replace thermostat (para
Faulty electrical connection - Clean and tighten battery
132).
cables and other connec-
Inoperative water pump ----Replace water pump (para
tions.
122).
Internal engine seizure ----- Report to direct support
Cooling system clogged ---- Flush out radiator and
maintenance.
engine.
Back pressure in exhaust inspect for and remedy re-
striations in exhaust
system.
Probable cause
Possible remedy
system.
Fuel tank valve closed ------ Open fuel tank valve
Fuel injection pump timing Time fuel injection pump
(para 71).
incorrect.
Fuel flow restricted ------- Clean or replace fuel lines
(para 71).
Clogged or dirty fuel filter--Service fuel lines (paras
35 and 36).
or No Oil Pressure
Fuel injection pump faulty - Report to direct support
Probable cause
Possible remedy
maintenance.
Low oil level ------------ Add oil. Refer to current
Fuel injectors dirty --------- Report to direct support
lubrication order.
maintenance.
Oil pressure gage or line Check, repair or replace
Adjust valve clearance
Valve tappets clearance
faulty.
(para 68).
(para 81.2).
incorrect.
Oil too light or diluted ---- Change oil. Refer to cur-
Cranking speed under 115 Recharge or replace bat-
rent lubrication order.
teries (para 38b).
Oil pump failure -------- Report to direct support
Starter faulty ----------- Replace starter (para 65).
maintenance.
Service air cleaner or re-
Clogged or dirty engine
place air cleaner ele-
air cleaner.
Oil line clogged or broken -- Clean or replace oil line.
ment (para 39).
Clogged oil filter ---------- Replace filter element
(para 30f).
Probable cause
Possible remedy
Missing cylinder or cylinders - Check cylinders for firing.
Probable cause
Possible remedy
Air or water in fuel lines -- Check connections, bleed
Oil leaks -------------- Locate and repair.
fuel lines (para 36).
Oil level too high ---------- Maintain proper oil level.
Clogged air cleaner -------- Service air cleaner (para
Refer to current lubri-
39).
cation order.
Engine idles too slowly ----- Increase to recommended
Incorrect grade of oil used -- Refer to current lubrica-
speed.
tion order.
Clogged or dirty fuel filters -- Service filters (paras 35
Worn, broken or stuck piston Report to direct support
and 36).
rings or worn valve guides. maintenance.
Adjust valve clearance
Valve tappet clearance
(para 81.2).
incorrect.
Clogged crankcase breather -- Clean breather end pipe.
AGO 8166A
