TM 5-3805-262-20
3-30. ENGINE TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ENGINE MISFIRES (Cont).
Step 3.
Operate engine for 15 minutes at idle
Unlock 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
pressure before completely removing when
e n g i n e i s h o t , F a i l u r e t o d o s o c o u ld
c a u s e s e v e r e b u r n s d u e t o h o t s t e a m
scalding you.
I f y o u a r e s c a l d e d b y h ot
steam, seek medical aid immediately.
Carefully remove radiator cap, and
measure coolant temperature using a
thermometer (be sure thermometer does
not touch any metal parts of radia-
tor) .
Coolant temperature must be between
175 to 202 degrees F.
speed to warm coolant.
a. If coolant temperature is not between 175 to 202 degrees F,
remove and test thermostat (page 4-87).
b. If coolant temperature is between 175 to 202 degrees F, rein-
stall radiator cap, close radiator cap access panel, and go to
step 4 below.
Step 4.
While assistant cranks engine
using ignition key switch,
check for fuel leaks at fuel
i n j e c t o r l i n e s.
a , I f f u e l l e a k s a r e s e e n ,
t i g h t e n f u e l l i n e s . If
tightening does no good,
notify next higher mainte-
n a n c e l e v e l ( f u e l i n j e c t o r
lines must be replaced).
b . I f f u e l l e a k s a r e n ot
seen, go to step 5 below.
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