ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
3-16.
MAINTENANCE OF ENGINE EXHAUST SYSTEM.
The engine exhaust system becomes extremely hot during generator set
operation. Do not touch muffler or exhaust pipe when they are hot.
a.
Maintenance of Weather Caps.
(1) Inspect Visually Inspect weather caps (1, Figure 3-23) for secure mounting, free lid movement, deformity,
and corrosion. Replace defective caps In accordance with step (2), below.
(2) Replace Loosen tightening bolt in weather cap (1) and remove cap from exhaust muffler elbow (3).
(3) Install. Install new weather cap (1) by clamping cap securely around exhaust muffler elbow (3) with
tightening bolt.
b.
Maintenance of Mufflers.
(1) Inspect Visually Inspect exhaust mufflers (9, Figure 3-23) for secure mounting, deformities, rupture, or
excessive corrosion Check muffler mounting hardware for excessive rust or damage.
(2) Install.
(a) Position replacement gasket (10) on roof of unit. Mount muffler (9) and secure with hexagon head
capscrews (4), hexagonal nuts (6), and lockwashers (5).
(b) Attach top section of muffler band (8).
(c) Install exhaust muffler elbows (3) and secure with muffler clamp (2).
(d) Attach weather cap (1).
(3) Replace.
(a) Loosen clamp and remove weather cap (1).
(b) Remove exhaust muffler elbow (3) by removing muffler clamp (2).
(c) Remove upper section of muffler band (8) by removing screws.
(d) Detach exhaust muffler (9) from root of unit by removing hexagon head capscrews (4), hexagonal nuts
(6), and lockwashers (5).
c.
Maintenance of Muffler Bands.
(1) Inspect. Check muffler bands (7 and 8, Figure 3-23) for secure mounting. Check for damage and excessive
corrosion Replace damaged bands In accordance with step (2), below.
(2) Replace A damaged muffler band (7 and 8) may be replaced without removing the exhaust muffler (9).
Obtain a support block with sufficient clearance to slip under the exhaust muffler near the band. This will
prevent excessive free play that may otherwise damage the muffler when the band Is removed.
(a) Remove the upper half of the muffler band (8) by removing the capscrews (4), lockwashers (5), flat
washers (16), and hexagonal nuts (6). Slip the support block under the exhaust muffler (9) immediately
adjacent to the lower half of the band.
(b) Remove the lower half of the muffler band (7) by removing the hexagon head capscrews (4) and
lockwashers (5).
(3) Install.
(a) Position lower half of new muffler band (7) under exhaust muffler (9) and over the band mounting holes.
Attach lower half of the muffler band (7) to the roof using hexagon head capscrews (4) and lockwashers
(5).
(b) Remove the support block Position upper half of muffler band (8) over the exhaust muffler (9) and
secure to the lower half of the muffler band (7) with hexagon head capscrews (4), lockwashers (5),
hexagonal nuts (6), and flat washers (16).
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