TM-9-2815-225-34-P
ENGINE, DIESEL: 6 CYLINDER IN-LINE TURBOCHARGED, CUMMINS MODEL NTC-400
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2005
TM-9-2815-225-34-P - Page 38 of 736
TM 9-2815-225-34&P
0004 00
0004 00-2
ENGINE TROUBLESHOOTING (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE WILL NOT
CRANK
a. Remove rocker covers and rotate
engine by attaching a socket and
breaker bar to accessory drive
nut.
b. Test for mechanical or hydraulic
seizure.
c. Check for bent pushrod(s) and
valve(s) not opening or closing.
b. If valve fails to open or close,
manually open valve with 3/4-in.
wrench. If valve(s) are seized,
remove corresponding cylinder
head (WP 0011 00).
Remove fuel injectors
(WP 0011 00).
Turn engine over several times to
displace liquid from cylinders
through injector openings.
If engine can be turned freely
after all liquids have been
displaced, install injectors. If
engine cannot be turned over
freely by hand, disassemble
engine and replace defective parts.
c. Replace pushrods and valves if
damaged.
2. ENGINE CRANKS
BUT FAILS TO START
a. Test for broken fuel gear pump
driveshaft.
b. Test for dirty or damaged
injectors.
c. Test for defective fuel solenoid
valve.
d. Test for faulty fuel pump.
(Disconnect fuel outlet hose;
crank engine to see if fuel comes
out.)
e. Test for incorrect injector
adjustment.
f. Test for incorrect valve clearance.
g. Test for incorrect injector timing.
a. Replace fuel gear pump drive
shaft if damaged (WP 0036 00).
b. Replace injectors (WP 0011 00
and WP 0043 00).
c. Replace fuel solenoid valve
(WP 0034 00).
d. Replace fuel pump (WP 0010 00
and WP 0040 00).
e. Adjust injectors (WP 0043 00).
f. Adjust valve(s) (WP 0043 00).
g. Adjust injector system timing
(WP 0043 00).
3. ENGINE STARTS,
MOTOR OPERATES
BUT DOES NOT
ENGAGE THE
RING GEAR
a. Inspect for defective starter
pinion gear.
b. Inspect for defective ring gear.
a. Replace starter pinion gear
(TM 9-2320-283-34).
b. Replace ring gear (WP 0007 00
and WP 0049 00).
Table 1. Engine Troubleshooting.
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