TM 9-2320-260-20
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COLD START SYSTEM
12. ENGINE CRANKS BUT WILL NOT START IN COLD WEATHER
Step 1. Check cold start electrical system (table 2-4, electrical troubleshooting, malfunction 36).
Step 2. Open air purge draincock, place drainage container under draincock, and operate
preheater pump.
Replace preheater pump if fuel is not discharged (para. 3-31).
Step 3. Disconnect hose from draincock and remove draincock with preheater nozzle. Connect
hose to draincock, direct nozzle into drainage container, and operate preheater pump.
Replace preheater nozzle if fuel does not discharge (para. 3-30).
END OF TESTING!
13. COLD START PRIMER PRESSURE GAGE READS IMPROPERLY
Check primer pressure gage for proper operation.
Connect pressure gage known to be good to fuel line and operate preheater pump. If test
gage indicates pressure, replace primer pressure gage (para. 3-29). If test gage indicates
improper pressure, replace preheater pump (para. 3-31).
END OF TESTING!
EXHAUST SYSTEM
WARNING
Do not touch hot exhaust system components with bare hands.
Injury to personnel may result.
14. EXHAUST COLOR BLUE DURING NORMAL OPERATION
NOTE
Blue exhaust indicates presence of excess engine oil in cylinder
combustion chamber.
Step 1. Check that engine oil grade is correct for vehicle use and climatic conditions (LO 9-2320-
260-12).
Replace oil (LO 9-2320-260-12) and oil filters if oil grade is incorrect (para. 3-5).
Step 2. Check that engine fuel grade is correct for vehicle use and climatic conditions (TM 9-2320-
260-10).
a. Drain complete fuel system and replace with correct grade of fuel if fuel grade is
incorrect (TM 9-2320-260-10).
b. If problem persists, notify your supervisor.
END OF TESTING!
15. EXHAUST COLOR WHITE DURING NORMAL OPERATION AND IDLE
CAUTION
Thick white smoke indicates coolant is present in engine combus-
tion chambers during operation. When this condition is evident,
shut engine down immediately and determine cause. Continued
engine operation may result in permanent engine damage.
Step 1. Check engine temperature. Ensure engine temperature is at specified level (TM 9-2320-
260-10).
If engine temperature is above operating level, perform malfunction 18.
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