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 10. (Cont).
B e f o r e p e r f o r m i n g f o l l o w i n g , b e s u r e t h a t t r a n s p o r t / s e r v i c e l i n k is
e n g a g e d . F a i l u r e t o d o s o c o u l d c a u s e s e r i o u s i n j u r y o r d e a t h d u e to
chassis pivoting and crushing you when you are working in area between
front and rear chassis.
At left front of rear chassis, watch lever of parking brake mounted
on transmission.
Tell assistant to start engine, allow air pressure to build up, them
pull out parking brake valve knob to apply parking brake. Check that
parking brake lever moves,
Tell assistant to push in knob of parking brake valve to release
parking brake while you watch parking brake lever.
Check that parking brake lever moves.
a. If parking brake lever does not move, remove and replace parking
brake chamber (page 7-8).
b. If parking brake lever moves, check parking brake linkage ad-
justment (page 7-16), then go to step 11 below.
Step 11. Remove drive belt from air compressor (page 7-96).
Start engine, and check if engine power increases.
Shut off engine.
a. If engine power increases, remove and replace air compressor
(page 7-88).
b. If engine power does not increase, go to step 12 below.
Step 12. Remove drive belts from fan,
a l t e r n a t o r , a n d c r a n k s h a f t p u l l e y s
(page 5-4).
Start engine and operate at idle speed for three minutes maximum.
Check if engine power increases; then shut off engine.
a. If engine power increases, check fan and alternator pulleys for
freedom of rotation.
I f a l t e r n a t o r p u l l e y i s s e i z e d o r d i f f i c u l t t o r o t a t e , r e m o ve
and replace alternator (page 5-10).
If fan pulley is seized or difficult to rotate, remove and re-
place water pump (page 4-94).
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