TM 9-6115-664-13&P
4-40.
EXTERNAL MUFFLER MAINTENANCE
This task covers inspection and repair.
INITIAL SETUP
Tools:
Equipment Condition:
Shop Equipment, Automotive Maintenance
APU Shut Down and Cold
and Repair (Item 1, App. B)
NATO Plug Disconnected
Parts/Materials:
Adhesive, Silicon (Item 2, App. E)
Anti-Seize Compound (Item 3, App. E)
A.
REMOVAL.
WARNING
External muffler and cover may be hot. Use caution when handling to prevent
bums. Allow time for parts to cool before removing.
NOTE
Discard and replace all lockwashers and locknuts when removed.
1.
Remove muffler cover (1, Figure 4-30) from housing (2) by removing four screws (3), lockwashers (4), washers (5),
and spacers (6).
2.
Remove external muffler (8) from exhaust assembly nuts by removing two screws (9), lockwashers (10), and washers
(11).
3.
Remove rain cap (12) from muffler (8) by loosening clamp (13).
4.
If replacement is required, remove housing (2) from APU enclosure by removing two screws (14), lockwashers (15),
and washers (16). These screws also secure the internal exhaust assembly to the APU enclosure.
B.
INSPECTION.
1.
Inspect muffler cover and housing for dents, cracks, warping, or other damage. Inspect painted surfaces for chips,
scratches, bare metal, roughness, or corrosion.
2.
Inspect silicon seal (7) for damage. Ensure secure attachment. Replace as required using silicon adhesive.
4-98
