Ruído do vento

501-25-86 Body Repairs - General Information 501-25-86 DESCRIPTION AND OPERATION 6WD to test Res Reference or ge XOW Action 7th Check the Yes Renew the seal vehicle for inad- or perform the equate or appropriate damaged seals. repair as neces- The sealing of a sary. Check vehicle can be whether the checked using measures have the stethoscope, been successful. the powder test, the smoke test and the ultra- sonic detector. (See under test method.) Could a leak be detected? No Step 8. 8th 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. 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. E62042 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.