TM 5-3805-262-20
3-4. ENGINE TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. ENGINE STALLS FREQUENTLY OR DOES NOT DEVELOP FULL POWER (Cont).
Step 12. (Cont).
b. If engine power does not increase, r e i n s t a l l a n d a d j u s t t e n s i on
of all drive belts (page 5-5 and 7-96) and notify next higher
maintenance level to check engine timing.
7. EXCESSIVE OIL CONSUMPTION.
Step 1.
Tell assistant to start and warm
engine to operating temperature.
Watch hourmeter/tachometer and tell
a s s i s t a n t t o i d l e e n g i n e .
Record tachometer indication.
T e l l a s s i s t a n t t o d e p r e s s a c c e l e r a t or
pedal until maximum governed speed of
2300 to 2340 rpm is obtained.
T e l l a s s i s t a n t t o d e p r e s s a c-
c e l e r a t o r p e d a l a s f a r a s it
will go.
Tachometer should indicate
2300 to 2340 rpm.
T e l l a s s i s t a n t t o i d l e e n g i ne
for three minutes then shut
off engine.
Tachometer indication at idle speed should be 700 to 750 rpm; tach-
ometer indication with accelerator pedal completely depressed should
be 2300 to 2340 rpm.
a.
b.
If engine rpm is not as specified above, check adjustment of ac-
c e l e r a t o r l i n k a g e ( p a g e 4 - 6 4 ) ; a d j u s t i f n e c e s s a r y . I f a d j u s t-
ment is okay, notify next higher maintenance level to adjust
fuel injection pump.
If engine rpm is as specified above, go to step 2 below.
Step 2.
Remove engine left rear side panel (page 9-14).
Remove engine oil pressure switch (page 5-112).
Install a zero to 100 psi pressure gage in port from which engine
oil pressure switch was removed.
Tell assistant to start engine and operate at idle speed.
Pressure gage should indicate 45 to 60 psi with engine at normal
operating temperature.
Tell assistant to shut off engine.
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