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 43 of 736
TM 9-2815-225-34&P
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ENGINE TROUBLESHOOTING (Contd)
Table 1. Engine Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
16. ENGINE MISSES OR
RUNS ERRATICALLY
a. Check for improperly adjusted
valves and injectors.
b. Check injector for leaking middle
O-ring.
c. Check for damaged rocker arms.
d. Check for broken fuel injector
plunger spring.
e. Check for broken or deformed
injector cup.
f. Check for plugged injector cup
spray holes.
g. Check for plugged metering or
drain orifice in fuel injectors.
h. Check for burned or excessively
pitted valves.
i. Check for cracked or broken
valve seat inserts.
j. Check for incorrect injection
timing.
k. Check for leaking injector
sleeves.
a. Adjust valves and injectors
(WP 0043 00).
b. Replace injector middle O-ring
(WP 0032 00).
c. Replace rocker arms
(WP 0020 00).
d. Replace fuel injector plunger
spring (WP 0032 00).
e. Replace injector cup (WP 0032 00).
f. Clean injector cups
(WP 0032 00).
g. Clean fuel injectors
(WP 0032 00).
h. Reface or replace valves and
valve seat inserts (WP 0014 00).
i. Replace damaged valve seat
inserts (WP 0014 00).
j. Adjust injection system timing
(WP 0043 00).
k. Replace injector sleeves
(WP 0043 00).
17. EXCESSIVE
GEAR NOISE
a. Check for broken or worn gear
teeth.
b. Check for excessive gear
backlash.
a. Replace gears or units having
damaged teeth (refer to
WP 0013 00, WP 0017 00
and WP 0036 00).
b. Replace defective gears or shafts
(refer to WP 0042 00).
18. EXCESSIVE OIL LOSS
a. Check for cracked or broken front
gearcase cover.
b. Check for defective seals and
gaskets.
c. Check for leaking rear cover oil
seal or gaskets.
a. Replace front gearcase cover
(WP 0010 00 and WP 0045 00).
b. Replace faulty seals and gaskets
as required.
c. Replace rear cover oil seal or
gaskets (WP 0013 00).
19. SLUDGE FORMATION
IN CRANKCASE
Check for moisture in crankcase.
a. Isolate the source and repair as
required.
b. Inspect for tears on head gasket
cylinder openings.
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