TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 510 of 1015
3-51. MUFFLER
TM 9-2320-272-24-1
INITIAL SETUP:
THIS TASK COVERS:
a. Removal
b. Inspection
c. Installation
APPLICABLE MODELS
REFERENCES (TM)
All
TM 9-2320-272-10
TOOLS
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
EQUIPMENT CONDITION
MATERIALS/PARTS
• Parking brake set (TM 9-2320-272-10).
• Exhaust stack removed (para. 3-48).
Gasket (Appendix D, Item 170)
Four locknuts (Appendix D, Item 291)
Locknut (Appendix D, Item 317)
GAA Grease (Appendix C, Item 28)
GENERAL SAFETY INSTRUCTIONS
Do not touch hot exhaust system components with
bare hands.
WARNING
Do not touch hot exhaust system components with bare hands.
Injury to personnel may result.
1.
Remove four locknuts (8), screws (14), and muffler shield (1) from muffler shield support (5).
Discard locknuts (8).
NOTE
Assistant will help with steps 2 and 3.
2.
Remove four nuts (7), lockwashers (6), two U-bolts (2), U-clamps (4), and muffler (3) from muffler
shield support (5). Retain lockwashers (6).
3.
Remove locknut (13), screw (9), exhaust pipe coupling clamp (12), muffler (3), and exhaust pipe
gasket (11) from exhaust pipe (10). Discard locknut (13) and gasket (11).
Inspect muffler (3) for cracks. Replace if cracked.
NOTE
Assistant will help with steps 1 and 2.
1.
Apply small amount of GM grease on flange of exhaust pipe (10), position muffler (3) with narrow
side facing away from cab (15), and install new gasket (11) and muffler (3) on exhaust pipe (10) with
coupling clamp (12), screw (9), and new locknut (13).
2.
Install muffler (3) on muffler shield support (5) with two U-clamps (4), U-bolts (2), four
lockwashers (6), and nuts (7).
3.
Install muffler shield (1) on muffler shield support (5) with four screws (14) and new locknuts (8).
3-146
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