Iveco DAILY M.Y. 2012, Body Builder Instructions

Page: 223 / 252

APPENDIX A - DAILY PASSENGER TRANSPORT
A-11
D
AILY
Printed 603.95.241 Base - 02/2012
Noise emissions and thermal insulation
A.4.3 Soundproofing insulation
In order to achieve good insulation, care must be taken to ensure installation of the soundproofing materials is as continuous
as possible, avoiding any interruptions; it is very important that the communicating hatchways between the passenger compartment
and the engine compartment, gearbox, rear axle etc., be well sealed.
It is recommended panels at least 15 mm thick with a layer of interposed septum be used for covering the floors, door wells and
steps.
Step compartment fasteners should have no cracks or interruptions allowing noise to enter; the same is also valid for the areas under
the doors.
Insulating and sound absorbent materials must be fixed in a manner that is sturdy and durable in order to prevent them becoming
detached and coming into contact with hot spots or moving parts. The use of good quality adhesives or metal meshes or other
holding devices is recommended.
A.4.4 Thermal insulation
From the thermal viewpoint, the most critical areas are near the turbocharger, manifold and exhaust pipes, silencer and the rotors
of the electric retarder.
When a non-metallic component of the bodywork is located near a critical area it must be protected, for example by means of a
layer of insulating felt covered with a sheet of aluminium, capable of withstanding a constant temperature of 250ºC and with
maximum coefficient of thermal conductivity of 0.1 W/mK.
In any case, the minimum distance between a critical point and the insulation must be no less than 80 mm.
When the available space is limited, especially to protect the polyamide piping and the electrical wiring harnesses, it is advisable to
shield them by means of an aluminium plate with sandwich insulation. The plate must have a conduction coefficient equivalent to
the felt coefficient value. Between the protected component and the shield there must be a minimum distance of 20 mm.
In order to maintain a pleasant temperature inside the vehicle, the insulation located inside the engine/gearbox compartment must
have a minimum coefficient of conductivity of 0.08 W/mK and a minimum temperature of 85ºC.
This acoustic-thermal insulation must cover the entire partitioning surface between the engine housing and the interior, including
steps, bulkheads and other potential heat penetration surfaces.
In areas where acoustic insulation is not necessary, such as near the electric retarder, thermal insulation using polyurethane foam,
with characteristics similar to those described, is acceptable.
Some points are not critical from the point of view of heat transmission, but must be taken into account to keep them away from
the bodywork components or installations which can be damaged by an excessive temperature.