TM 5-3805-280-24-1
Operational Checkout Procedure
FAN DIRECTION CHECK
Is fan installed correctly with concave (cupped) side
YES: Check complete.
(Arrow) of fan blade towards engine?
NO: Install fan correctly.
NOTE: If fan is installed backwards, about 50% of its
(See Remove and Install
capacity is lost.
Fan Guard in Group
0510.)
9005
10
32
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FAN BLADES CHECK
Are fan blades bent or twisted?
YES: Replace fan.
Are fan blades cracked or nicked?
NO: Go to next check.
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YES: Head gasket is OK.
ENGINE HEAD GASKET
Engine at normal temperature.
Go to next check.
SEAL CHECK
Radiator full.
NO: If there is a constant
flow of bubbles from tube,
Install radiator cap and tighten.
loose or damaged
cylinder head or a leaking
Place end of radiator overflow hose into a container of
head gasket may be
clear water.
indicated. Go to Engine
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Repair chapter.
Operate engine at fast idle. Load engine by holding a
hydraulic function over relief.
Look for bubbles coming from overflow tube. Do bubbles
flow from tube intermittently?
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