TM 5-3805-262-20
3-7. COOLING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE OVERHEATS (Cont).
Step 3.
I n s p e c t a l t e r n a t o r d r i v e b e l t s f o r d a m a g e , w e a r , o i l c o n t a m i n a t i o n,
or riding deeply in pulley grooves .
a. If any of the above conditions are seen, replace both belts as a
matched set (page 5-4).
b. If none of the above conditions are seen, go to step 4 below.
Step 4.
Open radiator cap access panel.
R e m o v e r a d i a t o r
c a p s l o w l y t o
r e l i e v e p r e s s u r e b e f o r e c o m p l e t e ly
removing when engine is hot. Failure
t o d o s o c o u l d c a u s e s e v e r e b u r ns
d u e t o h o t s t e a m s c a l d i n g y o u . If
you are scalded by hot steam, seek
medical aid immediately.
With engine idling, remove radi-
ator cap and watch coolant to
see if it moves indicating water
pump is operating.
a. If coolant movement is not
seen, replace water pump
(page 4-94).
b . If coolant movement is seen, shut off engine and go to step 5
below.
Before performing following step, make sure that engine is shut down.
F a i l u r e t o d o s o w i l l c a u s e s e r i o u s b o d i l y i n j u r y i f y o u a t t e m p t to
grasp fan. If you are injured, obtain medical aid immediately.
Step 5.
Grasp fan and see if you can move it forward and backward.
Check area around water pump for coolant leakage.
a. If fan can be moved forward and backward, bearings in water pump
are bad. Replace water pump (page 4-94).
If coolant leakage is seen in area around water pump, water pump
has bad seal. Replace water pump (page 4-94).
b. If fan cannot be moved forward and backward and coolant leakage
is not seen, go to step 6 below.
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