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OM3072 2/13
Attenuators
General
Attenuators are fitted in various places around the
engine compartment to muffle the noise. A typical
attenuator is made of up numerous perforated split-
ters (2, Figure 30-2). Each splitter is filled with a spe-
cial insulation pillow (3, Figure 30-3).
Periodically, the attenuators need to be inspected
and disassembled for maintenance. Refer to Sound
Attenuation System Service for inspection and main-
tenance intervals.
The insulation pillow should have a protective cloth
between the insulation and the perforated cover. The
insulation should be clean, soft, and free from debris.
The insulation should be of consistent density, and fill
the cavity completely, not slumping to the bottom.
Remove any debris, oil, or grease present in the sys-
tem as required. Never use a pressure washer to
clean an attenuator, as damage to the protective
cloth and the insulation may result.
Do not pressure wash the sound attenuation sur-
faces. Malfunction and damage may occur,
reducing the effectiveness of the attenuators.
FIGURE 30-3. ATTENUATOR CROSS SECTION VIEW
1. Housing
2. Splitter (Perforated)
Operating Instructions - Section 30
FIGURE 30-2. TYPICAL ATTENUATOR ASSEMBLY
1. Housing
2. Splitter (Perforated)
3. Insulation
3. Insulation Pillow
Page 30-3
4. Baffle
5. Spacer
6. Cap Screw
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