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 TM 9-2320-285-24-1
2-11.
COOLING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ENGINE OVERHEATS (Cont)
Step 6.
Check fan belts for proper tension.
Depress fan belts midway between fan pulley and crankshaft pulley.
Fan belts should deflect approximately 1/2 inch.
a.
If fan belts do not deflect approximately 1/2 inch, adjust tension (para 2-15d).
b.
If fan belts deflect approximately 1/2 inch, go to step 7 below.
Step 7.
Inspect fan belts for damage or wear.
Check if fan belts are covered in oil or riding deeply in pulley groove.
a.
If any of the above conditions are observed, replace fan belts (para 2-15d).
b.
If none of the above conditions are observed, go to step 8 below.
Step 8.
With key switch turned to on position, engine shut down, and at least 100 psi pressure in air system, try
to rotate fan manually.
a.
If fan does not rotate, or fan belts slip, go to step 9 below.
b.
If fan rotates, and fan belts do not slip, fan drive assembly is defective; notify direct support
maintenance.
Step 9.
Check fan blade assembly for damage.
a.
If fan blade assembly is damaged, replace (para 2-15d).
b.
If fan blade assembly is not damaged, go to step 10 below.
WARNING
Remove radiator cap slowly to relieve pressure before completely removing when engine is hot. Failure to
follow this procedure could cause severe injury. If you are scalded by steam, seek medical aid immediately.
2-32
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