
Originally Posted by
evo_ski
Clearly yours are different than OEM bixenons then. On my OEM Valeo Bixenons, both S4 and Ecode they have three connection points. A top fixed point directly above the lower adjustable pivot connected to the height adjustment motor (toward the fender), and a side adjustable pivot connected to the inner (toward motor) adjustment screw.
With those three points of contact the single outer screw (toward the fender) will pivot the up and down adjustment, which is why they have the height adjustment motor connected to it. Spinning the other inner adjuster screw simply rotates the headlight plate about the vertical axis from the height adjustment motor and the fixed ball joint above the motor. Spinning both of the screws at the same time on an OEM bixenon will make the headlight adjust in a diagonal fashion rather than directly up and down.
I am just so confused as to whey everyone insists that you must spin both the same amount and same direction, but no one says why they do that or what they have observed when they do that. It must be that either the single xenons are built differently, or the Depo and other aftermarket brands adjust differently.
The requirement for adjusting both adjusters turning equally for the vertical beam aim, does not apply to the bi xenon housings with the adjuster on the same centerline with the ball socket mount inside the housing. The requirement for co adjusting both adjuster screws equally for the vertical aim, only applies to the low beam only housings that use a different mounting layout for the interior movable parts. The requirement for co adjusting both adjusters equally is specified by Audi, according to the design of the low beam only HID housings. I don't know if Depo housings use the same mount arrangement or not. If not then co adjustment of both adjusters for the Depo housing may not be required.
For the OEM low beam only headlights, the lower mount ball joint is a fixed unmovable point for halogen housings, with the adjuster screws on the top on each end of the internal moving part. The outer screw plus the inner screw tip the internal projector mount up and down, pivoting on the lower ball joint, without moving the projector mount sideways in the horizontal direction. If the inner screw is turned, only the horizontal aim is changed, by pivoting the projector mount on the upper outer ball joint and the lower ball joint. (The vertical aim does change a little, thus the horizontal first vertical second adjustment order,) If only the outer screw is adjusted, the vertical and horizontal beam aim change at the same time. For HID housings, the lower fixed ball joint mount is replaced by the auto leveling servo motor, then when that motor moves the lower ball joint in or out, the projector mount pivots on both of the upper ball joints equally, so the horizontal aim does not change when the auto leveling makes adjustments to the vertical beam elevation. BTW, the vertical aim changes a little bit when the inner adjuster screw is turned, that is why the horizontal beam aim is adjusted before the vertical beam aim is adjusted for the basic adjustment, then the aim is fine tuned in both vertical and horizontal aim after getting the setting close to correct. in horizontal then vertical order.
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