TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 222 of 1313
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:
A. EXHAUST MANIFOLD
- Collects exhaust from cylinder head ports and directs it to front exhaust pipe.
B. FRONT EXHAUST PIPE
- Directs exhaust to rear exhaust pipe.
C. FLEX PIPE
- Part of rear exhaust pipe; allows flexibility for vibration and expansion in system.
D. REAR EXHAUST PIPE
- Directs exhaust to muffler.
E. MUFFLER
- Quiets exhaust noises.
F. MUFFLER SHIELD
- Protects personnel from muffler heat.
G. EXHAUST STACK
- Directs exhaust from muffler away from vehicle.
H. TURBOCHARGER
- Compresses the intake air above atmospheric pressure.
A
G
F
E
D
C
B
H
G0024DAA
Figure 12.
Exhaust System Components.
TM 9-2320-272-23-1
0003
0003-17
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