TM 5-3825-270-23&P
0015
BELT
Figure 1. Alternator Belt - Step 2.
NOTE
Water pump and cooling fan are mechanically linked through same pulley that is rotated by
alternator belt. Abnormal cooling fan rotation due to loose alternator belt may also affect water
pump rotation and cause overheating.
5.
Visually check fan operation for free-rotation (binding), adequate fan speed, and abnormal noise.
6.
Shutdown engine. (TM 5-3825-270-10)
CONDITION/INDICATION
Is alternator belt tight and fan rotation normal?
DECISION
No - Tighten alternator belt (WP 0079) or replace alternator belt if damaged. (WP 0080) Replace water pump/
cooling fan pulley if damaged or binding. (WP 0071) Verify problem is solved. (Step 8 - Does engine
overheat?)
Yes - Go to step 3. (Step 3 - Is engine oil at appropriate level and free of contamination?)
STEP 3
Is engine oil at appropriate level and free of contamination?
WARNING
Engine components become hot during normal operation. Allow engine to cool completely
prior to performing this task. If necessary, use insulated pads and gloves. Failure to comply
may result in injury or death to personnel.
NOTE
Milky and/or abnormally smelling engine oil are signs of engine coolant contamination in
engine oil.
1.
Check engine oil level. (WP 0069)
2.
Obtain engine oil sample and inspect for signs of contamination. (TM 5-3825-270-10)