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).
S t e p 8 . ( C o n t ).
a. If engine speed is 1430 rpm minimum, engine, torque converter
and transmission, and hydraulic system are probably okay.
Reconnect tachometer cable to engine tachometer drive (page
5-67). Go to step 10 below.
b. If engine speed is not 1430 rpm minimum, go to step 9 below.
Step 9.
Start engine and operate at idle speed.
Release parking brake and place transmission control lever in H
p o s i t i o n.
Press and hold down brake treadle and valve pedal for remainder of
t e s t .
P r e s s a c c e l e r a t o r p e d a l f u l l y .
Press tachometer against engine tachometer drive shaft.
Tell assistant to watch thermometer of temperature probe installed
in transmission elbow.
When transmission temperature reaches 200 degrees F and tachometer
pointer stops moving, record engine speed as indicated by tachometer
p o i n t e r .
Engine tachometer drive shaft operates at half engine speed. Double
tachometer indication to obtain engine rpm.
Engine speed should be 2000 to 2100 rpm using number 2 Diesel fuel
and 1900 to 2000 rpm using number 1 Diesel fuel.
Release accelerator pedal and place transmission control lever in N
p o s i t i o n.
Allow engine to operate at idle speed for 3 minutes then shut off
engine.
a. If engine speed is 2000 to 2100 rpm using number 2 Diesel fuel
or 1900 to 2000 rpm using number 1 Diesel fuel, engine and
torque converter and transmission are probably okay. Problem is
in hydraulic system; notify next higher maintenance level to
perform hydraulic system flowmeter checks to locate problem.
b. If engine speed is not 2000 to 2100 rpm using number 2 Diesel
fuel or 1900 to 2000 rpm using number 1 Diesel fuel, problem is
in engine. Reconnect tachometer cable to engine tachometer drive
(page 5-67). Go to step 10 below.
Step 10. Put transport/service link in engaged position if not already in
engaged position (page 9-8).
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