Ford Fiesta (2011 year). Manual — part 107
Reference or
Action
Res
ult
to test
Sta
ge
Renew the seal
or perform the
appropriate
repair as neces-
sary. Check
whether the
measures have
been successful.
Yes
Check the
vehicle for inad-
equate or
damaged seals.
The sealing of a
vehicle can be
checked using
the stethoscope,
the powder test,
the smoke test
and the ultra-
sonic detector.
(See under test
method.) Could
a leak be
detected?
7th
Step 8.
No
Under certain
circumstances
there may be a
constructional
problem which is
not yet known
about. Record
the problem in
an Express
Service Report
and send it on by
the usual
method.
8th
Possible concerns with corrective
measures
NOTE: Instructions on general noise are
summarized separately in the Noise, Vibration and
Harshness section. These can be useful when
searching for the causes of wind noises.
There follows an outline of the possible concerns
relating to wind noises. Selected examples are
given showing the causes of wind noises and the
ways in which they can be eliminated. They are
intended to provide troubleshooting tips and
suggestions for the user but do not represent an
exhaustive faults list. The topics are subdivided by
the different groups of components.
The test procedures described in the Noise,
Vibration and Harshness section can be used when
troubleshooting.
Seals
In general, seals are very important when
eliminating wind noises. Special attention should
always be paid here to the possible causes of wind
noises.
Take the following points into account:
• Seals age, i.e. they become porous and with
time they lose their original elasticity. If the
vehicle is relatively old and there are already
visible signs of distortion or damage to a seal,
then it should be replaced.
• At high speeds the doors or hatches may lift
slightly from the seal surfaces because of
variations in air pressure. Wind noises are
caused when the preload on the sealing surface
is not sufficient. The preload depends on the
installation position of the components, the
elasticity of the seal and the location of the
sealing flange.
• The contact surface of the seal must be
sufficient. This can be checked using the chalk
test. If the specifed width of the contact surface
is not known, you must determine it on another
component of identical construction.
• A bulging seal carrier indicates that the sheet
metal of the retaining flange is uneven.
G468075en
501-25-
82
Body Repairs - General Information
501-25-
82
DESCRIPTION AND OPERATION
201
• Seals must be correctly installed. Special
attention must be paid at corners -arrow- that
the installation follows the contours.
• The seal must not show any kinks or folds or
any other damage.
• Seals must seal all around their circumference.
Gaps in seals result in openings which lead to
an increased incidence of noise. In this respect,
it is especially important to pay attention to the
seals in the area of the windows.
Remedial Action
Renew older seals which no longer have adequate
preload. Deformed or widened retaining flanges
must be reworked and provided with a new seal.
The corner areas -arrow- of a seal must be
properly seated. In some circumstances, a butyl
sealing strip must be affixed to support the sealing
at a corner.
Bonded joints
Glass is usually installed today using a bonded
joint. Gaps in the bonded joint can lead to noises
in the vehicle interior. If there are noises which are
believed to be associated with window glass, the
following points should be checked:
Gap in window bonding
• The window must be bonded without any gaps
-arrow-. Leaks can be found using the ultrasonic
tester or compressed air carefully blown from
inside onto the window glass bonding.
• The installed position of the window glass must
be correct. It must not have been bonded into
a position which is too low or offset to one side.
• The sealing or trim strips must fit tightly and the
glass must be mounted so that it is fully
enclosed. If a sealing or trim strip has not been
applied with enough pressure, high air speeds
can cause it to lift up. This can lead to wind
noises at higher speeds. Apply masking tape to
these areas for test purposes.
Corrective measures
Leaking areas of the window glass bonding
material can be sealed using PU sealing
compound. Pay special attention at the front
windshield, that any breaks in the bonding are not
too large. Otherwise the glass must be removed
and bonded in place again.
The installed location of a window glass cannot be
corrected. It must be removed and bonded into
place again.
Replace the trim strips or secure the lip seal using
PU adhesive.
Gaps, edges
Door gaps and edges are places where air
turbulence can form. This causes noises which can
be perceived as troublesome.
Gaps and edges - problem areas
Doors, hood and tailgate can cause wind noises
because of gaps -arrow- which are too large. If the
components are not installed flush to the bodywork
or the neighboring component, air break edges can
arise, which in turn can create a wind noise.
G468075en
501-25-
83
Body Repairs - General Information
501-25-
83
DESCRIPTION AND OPERATION
201
The sun roof may be the cause of whistling noises
in the roof area. The sun roof may be incorrectly
adjusted or the seal on the sun roof may be
damaged.
Noises from the door area could come from a
window which does not fully close. Side guides
(seals) can also be the cause of wind noises.
The covers of window frames can be incorrectly
mounted or aligned. The quarter-lights in doors
must also be checked for correct installation.
Corrective measures
Check the gaps and adjust them according to the
specifications. If there are problems at the sun roof,
correct the adjustment and if necessary replace
the seals.
Problem area at side windows
Side windows which do not fully shut -arrows- must
be adjusted. If the vehicle is equipped with electric
window regulators, the remedy may be to perform
the window regulator learning process again. In all
cases, make certain that the glass enters far
enough into the seal.
Ancillary Components
Components installed on the bodywork may cause
noises when they are not correctly mounted.
When troubleshooting it may be helpful to remove
the suspected component or, when this is not
possible, to mask it off with suitable covering tape.
Roof moldings, roof rail, roof antennas
Moldings and roof moldings must touch the
bodywork along their whole length without any gap.
Check the end sections in particular. These must
neither have any splits nor stand away from the
bodywork.
Noises may come from the roof rail if the seal
between it and the roof is not correctly installed or
is cracked. Gaps at the mounting grooves of the
carrier can also create wind noises.
The roof antenna and antenna foot seal must be
correctly secured. The seal must lie completely on
the roof and must not be damaged.
Roof moldings mounting
If the original mounting points of the roof moldings
are in good condition, the fixing can be improved
using silicone sealant -arrow- if necessary. Align
or renew the seals of the roof rail. Reduce the
clearances of the mounting grooves.
Corrective measures
If the original mounting points of the roof moldings
are in good condition, the fixing can be improved
if necessary using silicone sealant -arrow-.
Exterior mirrors
Exterior mirrors or covers of exterior mirrors which
are not correctly mounted cause noises. The cover
must lie evenly on the component and must not lift
during driving. There are ducts present on the
doors for the electrical or mechanical adjusters for
the exterior mirrors. If there are leaks, wind noises
will be caused. Holes can also be present at the
transition to other components.
Exterior mirror seals
G468075en
501-25-
84
Body Repairs - General Information
501-25-
84
DESCRIPTION AND OPERATION
201
There are ducts present on the doors for the
electrical or mechanical adjusters for the exterior
mirrors. If there are leaks, wind noises will be
caused. Holes can also be present at the transition
to other components.
Remedial Action
If there is inadequate sealing of the foam seals -2-
they must be replaced or supplemented with
suitable material. Transitions to other components
can be sealed with butyl sealing compound -1-.
Moldings, covers, door handles, windshield
wiper arms
Moldings and covers especially tend to cause wind
noises because of their location. These
components interrupt smooth bodywork surfaces
and air turbulence therefore arises at the edges.
If there are noise concerns in the area of the doors,
check especially for gaps and projections. Moldings
must not stand away from the bodywork or the
door. There must not be any gaps or discontinuities
at the location of joints.
Incorrectly adjusted windshield wiper arms can
cause wind noises. Especially if they are too far
over the glass surface when in the rest position.
Wind noises in the transition area between the air
cowl cover and the wing or the windshield can be
caused by an incorrectly installed air cowl cover.
At high air speeds the air cowl cover may lift and
noises will then occur.
Because of their necessary mechanical features,
door handles have a range of openings and edges
which allow noise to be generated. The door handle
can be masked off for testing purposes. If a
reduction in wind noises is noticed, inadequate
sealing may be the reason for the noises.
Remedial Action
Openings which are used to secure trim panels
must be checked for leaks. Any leaks found can
be rectified using butyl strips.
Loose or damaged outer trim on the pillars -arrow-
must be secured or replaced.
A butyl sealing strip -1- can be laid underneath the
cover in the transition area between the air cowl
cover and the wing or windshield.
The sealing of the door handles must be renewed
when required. In addition, noise absorbing
material can be applied to the back of the door
handles.
G468075en
501-25-
85
Body Repairs - General Information
501-25-
85
DESCRIPTION AND OPERATION
201
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст