M-Class (W166) Produced 2012-2015

Low beam headlamp adjustment?

Old Jan 6, 2017 | 08:11 PM
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Low beam headlamp adjustment?

I've been searching for a pic on where the adjustment screws are for the W166 ML350 halogen headlamps, and am having a heck of a time. Can someone tell me where they are, and which one adjusts height vs left/right orientation? Thanks!
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Old Jan 9, 2017 | 06:38 AM
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Well I guess no one adjusts their headlamps.
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Old Jan 9, 2017 | 09:27 AM
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Its on top of the headlight, there is a 1/2" hole on the metal housing on top of the headlight. Look thru that hole and you will see a white plastic hex Allen screw, you can turn that screw with a long Allen T handle wrench or a long flat screwdriver. With the car on, put the headlight in manual on and if I remember right, CW is down.
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Old Jan 9, 2017 | 01:17 PM
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Many thanks!!
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Old Jan 15, 2017 | 06:13 AM
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I installed LED low beam today and the aim is horrible! After hours of tinkering with the only adjuster, the vertical I believe, I realized the horizontal is the issue. Does anyone know where the adjuster for horizontal adjustment is?
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Old Jan 21, 2017 | 10:32 PM
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Originally Posted by The G Man
Its on top of the headlight, there is a 1/2" hole on the metal housing on top of the headlight. Look thru that hole and you will see a white plastic hex Allen screw, you can turn that screw with a long Allen T handle wrench or a long flat screwdriver. With the car on, put the headlight in manual on and if I remember right, CW is down.
I looked and looked. Don't see that hole. Can you post some pics? Please.
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Old Jan 23, 2017 | 09:36 AM
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Originally Posted by DanD.
I looked and looked. Don't see that hole. Can you post some pics? Please.

Forget the hole, just look for the white plastic hex screw on top of the headlight. Take a look at the pic above, its the plastic screw in the bottom right of pic, be careful, that screw is easy to strip.

Last edited by The G Man; Jan 23, 2017 at 09:38 AM.
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Old Jan 25, 2017 | 12:13 AM
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Originally Posted by csml350
I installed LED low beam today and the aim is horrible! After hours of tinkering with the only adjuster, the vertical I believe, I realized the horizontal is the issue. Does anyone know where the adjuster for horizontal adjustment is?
AFAIK there is no horizontal adjustment... and even if there is/was one, chances are it wouldn't do you any good. While LEDs look cool, their beam pattern is very different from that of a halogen bulb and the result is outright unacceptable if you're actually trying to illuminate the road instead of trying to look cool to oncoming traffic. A (somewhat) better option is to go with HIDs, and even those are not going to be ideal.

See discussion at https://mbworld.org/forums/new-m-cla...-question.html (and excuse the fighting... it has since been amicably resolved).

Last edited by Diabolis; Jan 25, 2017 at 12:15 AM. Reason: Linked wrong thread... now corrected.
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Old Jan 25, 2017 | 04:19 AM
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Originally Posted by Diabolis
AFAIK there is no horizontal adjustment... and even if there is/was one, chances are it wouldn't do you any good. While LEDs look cool, their beam pattern is very different from that of a halogen bulb and the result is outright unacceptable if you're actually trying to illuminate the road instead of trying to look cool to oncoming traffic. A (somewhat) better option is to go with HIDs, and even those are not going to be ideal.

See discussion at https://mbworld.org/forums/new-m-cla...-question.html (and excuse the fighting... it has since been amicably resolved).
Thanks for the info. I did switch to HID and moved the LED to high beams. LED's range was too short for me and the cutoff is almost non-existent. For HID the cutoff is still quite horrible compared to OEM lights on my previous cars but at least it's a projector in there...I had a 328 with halogen bulbs and it was much harder to retrofit HID due to reflector housing.

I guess that'll do it for now. Never gonna buy a car without OEM HID in the future =(

Last edited by csml350; Jan 25, 2017 at 04:23 AM.
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