TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
(1) Troubleshooting the Malfunction:
ENGINE WILL NOT CRANK.
Step 1.
Check for evidence of a seized engine.
To do this, use a
socket and breaker bar at the crankshaft pulley. Ensure that manual
clockwise rotation of the engine is possible. If in the event manual
clockwise rotation is not possible, this indicates that the engine is
seized, and intermediate support (IDS/IGS) maintenance should be
notified.
Step 2. Check the starting system. Refer to table 2-3, electrical
troubleshooting, malfunction 3 STARTER WILL NOT CRANK, page 2-31 of
the TM.
(2) Troubleshooting the Malfunction:
ENGINE COOLANT TEMPERATURE
GAGE ABOVE 230 F ENGINE OVERHEATS.
Step 1. Inspect the drivebelts and pulleys for damage. Replace any
damaged parts.
Check and adjust the drivebelts following the
procedures contained in paragraph 3-76, page 3-126 of the TM.
WARNING
Use caution when testing
the
thermostat.
Hot
water will cause burns.
Step 2.
Check the thermostat for proper operation.
Remove the
thermostat following the procedures contained in paragraph 3-70, page
3-116 of the TM. Place the thermostat in a container of water known
to be 190 F and observe the valve.
Replace the thermostat if the
valve does not open.
When installing the thermostat, follow the
procedures contained in paragraph 3-70 of the TM.
Step 3. Inspect the radiator for bent fins. Straighten bent fins or
replace the radiator following the procedures contained in paragraph
3-57, page 3-102 of the TM, if the radiator is damaged beyond repair.
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