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 58 of 481
TM 9-2320-272-10
1-41
1-18. POWER SYSTEM OPERATION (Contd)
d. Exhaust System Operation.
The exhaust system directs exhaust gases away from the vehicle for all models
covered in this manual. Major components of the exhaust system are:
EXHAUST STACK
– Directs exhaust from muffler away from vehicle.
EXHAUST MANIFOLD
– Collects exhaust from cylinder head ports and
directs it to front exhaust pipe.
FRONT EXHAUST PIPE
– Directs exhaust to rear exhaust pipe.
FLEX PIPE
– Part of rear exhaust pipe and allows flexibility for vibration
and expansion in system.
REAR EXHAUST PIPE
– Directs exhaust to muffler.
MUFFLER
– Quiets exhaust noises.
MUFFLER SHIELD
– Protects personnel from muffler heat.
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