TM 9-2320-211-20
Table 2-3. TroubleshootingVehicleContinued
Item
Probable Cause
Corrective
Action
No.
Malfunction
DIESEL AND MULTIFUEL
ENGINE
a. Defective starter switch.
Replace starter switch (para 2-128).
14 Engine will not crank.
b. Defective master switch.
Replace master switch (para 2-154).
c. Battery cables loose or dirty.
Clean and tighten cables.
Replace batteries (para 2-22).
d. Defective battery
Replace starter and starter solenoid
e. Defective s t a r t e r or starter
(para 2-128, 2-129).
Notify supporting maintenance.
f. Hydrostatic lock or mechanical
seizure within engine.
15 Engine cranks but fails to start
Service filters as necessary (para 2-
a. Dirty or defective fuel filter(s).
82, 2-88).
(adequate fuel in tank).
b. Clogged or defective fuel supply
Notify supporting maintenance.
pump.
c. Engine starter cranking speed to
Defective battery or starting system.
low.
Damaged starter pinion or drive
16 Engine starting motor operates
Replace starter and starter solenoid
assembly.
but does not engage flywheel ring
gear.
17 Engine manifold heater fails to
Replace heater switch (para 2-142).
a. Defective heater switch
Test and replace as necessary (para 2-
b. Defective ignition unit lead or
operate properly (cold weather
33).
starting).
spark plug.
Replace manifold heater fuel pump
c. Defective manifold heater fuel
(para w-93 and 2-94).
pump.
Replace thermostat(s) (para 2-115).
18 Engine starts, but misfires or does
a. Engine temperature below normal.
not run smoothly; exhaust may
contain considerable amount of
Service fuel filters and drain fuel
b. Water or dirt in fuel
bluish-white smoke.
tank.
Service air cleaner (para 2-77).
c. Partially restricted air cleaner or
air duct.
19 Engine low on power
Drain tanks; refill with proper fuel.
a. Improper fuel being used.
Replace filter element (para 2-82 and
b. Clogged fuel filter
2-88).
Service air cleaner (para 2-77).
c. Air cleaner restricted; note air
filter indicator.
d. Leaking exhaust system causing
Repair exhaust system leaks.
reduced pressure to turbocharger.
Check fan belts tension; replace belts
20 Engine overheats as indicated by
a. Fan belts loose, worn, or broken.
or adjust as required (para 2-111,
coolant temperature gage.
2-112).
Replace gage (para 2-153).
b. Defective coolant temperature
gage.
c. Defective coolant temperature
Replace sending unit (para 2-167).
sending unit.
Replace thermostat (para 2-114).
d. Defective or sticking thermostat.
Remove restriction. Clean radiator
e. Restricted air flow through
fins.
radiator assembly.
Refer to Para 2-109
f. Defective cooling system
Check engine oil for proper level and
g. Inadequate engine lubrication.
proper viscosity.
Replace fuel filter element
h. Insufficient fuel pressure
Check engine oil for proper level and
21 Engine oil pressure low as in-
a. Inadequate engine oil supply; low
proper viscosity; replenish oil.
oil level.
dicated by oil pressure gage.
Replace gage (para 2-148).
b. Defective oil pressure gage.
Replace sending unit (para 2-163).
c. Defective oil pressure sending unit.
Drain and refill with oil of proper
d. Improper oil viscosity
viscosity (LO 9-2320-211-12).
22 Engine oil consumption excessive.
Service as necessary
a. Restricted crankcase breather.
Drain and refill with oil of proper
b. Improper oil viscosity
viscosity.
23 Defective air intake system.
Service air cleaner (para 2-77).
a. Air cleaner restricted; note air
filter indicator.
Remove restriction
b. Restricted air-inlet ducts.
*Refer to footnote at end of table.
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