TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 204 of 481
TM 9-2320-272-10
2-103
NOTE
• If engine needs additional ether to prevent stalling, perform
step b. again.
• At temperatures below 0°F (-18°C), M939A2 series vehicles will
need to be repeated up to six times before engine will start. The
engine start switch on the M939A2 series vehicles must be held
in the START position to inject ether.
d.
Check your instruments again (para. 2-12).
e.
If necessary, pull out hand throttle control (2) until tachometer (4) indicates
an operating range of 700-800 rpm (800-1000 rpm on M939A2 vehicles).
f.
Allow engine to warm up approximately ten minutes. If engaged, disengage
hand throttle control (2) by rotating handle and pushing in to allow engine speed to
drop to idle after warmup period.
g.
Stop engine immediately by pulling out EMERGENCY ENGINE STOP
control (7) if at any time one or more of the following conditions arise:
(1)
Noisy engine and/or excessive engine vibration.
(2)
Engine oil pressure does not register, or suddenly drops to less than
15 psi (103 kPa) on M939/A1 series vehicles or 10 psi (69 kPa) on M939A2 series
vehicles, as indicated by engine oil pressure gauge (6).
(3)
Sudden increase in engine coolant temperature as indicated by engine coolant
temperature gauge (5). Normal operating temperature is 175°-200°F (79°-93°C).
(4)
Engine continues to run after ignition switch (1) and battery switch (3)
are turned to OFF positions.
h.
After an emergency shutdown, the engine will not restart until unit
maintenance resets the fuel shutoff valve. On M939A2 series vehicles, position
EMERGENCY ENGINE STOP control (7) to reset.
2-13. COLD WEATHER STARTING (BELOW +32°F) (O°C) (Contd)
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