TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 136 of 1176
TM 9-2320-361-24-1
0008 00
0008 00-8
MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. EXHAUST COLOR
BLUE DURING
NORMAL
OPERATION (Contd)
4. Check valve seats, valve
guides, or cylinder head
gaskets for defects. Remove
cylinder heads (WP 0027 00)
and disassemble
(WP 0438 00).
5. Repeat steps 1 and 2 of
enigine oil consumption test.
If valve seats, valve guides or
cylinder heads are defective,
replace (WP 0443 00 or
WP 0027 00).
If oil consumption remains more
than one quart for every 60 mi
(96 km), piston rings or cylinders
bores may be worn or defective.
Replace defective components.
Perform compression test. If the wet
compression test raises compression
readings more than 50 psi (345 kPa),
a piston ring or cylinder bore
problem is indicated. Replace engine
(WP 0046 00).
12. EXHAUST COLOR
WHITE DURING
NORMAL
OPERATION AND
IDLE
CAUTION
Thick white smoke indicates coolant
is present in engine combustion
chambers during operation. When
this condition is evident, shut engine
down immediately and determine
cause. Continued engine operation
may result in permanent engine
damage.
1. Check engine temperature. Ensure
engine temperature is within
operating temperature
(TM 9-2320-361-10).
WARNING
Hot coolant is under pressure. Care
should be used when removing
coolant filler cap or inspecting hot
engine coolant leaks. Steam or hot
coolant under pressure may cause
severe injury to personnel.
2. Pressure test warm engine cooling
system (TM 750-254). Observe
pressure tester reading.
1. If pressure test reading declines
and there is no indication of
external leaks, coolant is leaking
internally into engine or
combustion chambers. Remove oil
dipstick and check engine oil for
presence of coolant.
Table 1. Engine Troubleshooting Procedures (Contd).
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