NOISE ATTENUATION
Page NOISE ATTENUATION-4
Z001007/0_4_September 2007
INSTALLATION INSTRUCTION
Before attaching the noise-absorbing material, make sure that there is sufficient space for movements of the
engine during operation. Noise-absorbing material is available in different types and thickness.
Provide a free space of 8" (180 mm) (ill. 14/4) in front of the engine, to permit its dismantling.
14. 3. NOISE ABSORBING HOODS AS SUPERSTRUCTURE
On small commodity boats and normally on all sport boats, at first engine and reversing gear are provided with
an elastic suspension - see chapter 3. However, in case of an elastic stem tube, no elastic coupling may be
mounted.
Then the engine compartment preferably is built as self-containted construction, with a hinged cover as top (ill.
14/3).
Attention:
Always consider enough space for maintenance of the engine - see respective operating instructions.
The engine protection is made of 1/12" (2 mm) steel plate or 3/4" (19 mm) plywood.
A 3/8" (10 mm) rubber strip is used as cover sealing.
For ventilation of the engine, two air intakes (see chapter 7) for sufficient air supply are to be provided. The air
intakes are connected to the bottom edge of the engine compartment by means of rubber hoses which ensures
sufficient noise reduction without any further measures.
Exhaust air of the engine compartment is conducted via two noise catchers with the some cross section as that
of the air intakes. These noise catchers must be insulated on both sides with the same material used for the inner
side of the engine protection.
In hot regions it may be necessary to install fans (see chapter 7.8) for air exhaust.
Atmospheric temperature of the engine may rise to a max. value of 40 - 45°C only. However, a temperature as
low as possible should be the aim.
ill. 14/4
Содержание 4 Cylinders
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