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Old 11-06-2006, 02:47 PM
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Join Date: Mar 2006
Posts: 545
headlight replacement - use different fasteners?

On Sunday I replaced the headlamps in my 83 300sd with some good Bosch
H4 units. I'm ashamed to admit that my Merc had cheap n' cheerful generic auto parts store sealed beams installed with awful light patterns.

All went well with the job apart with some minor difficulty with the retaining ring that holds the lamps in place - the short Philips screws that hold the ring in place just wouldn't hold and I had to use longer screws in a couple of spots. My guess is that the metal clip into which the screws mount was too corroded.

Has anyone replaced the fasteners with new ones or used nylon fittings instead? I am worried about corrosion over the longer term and you need to remove the retaining rings to change the bulbs each time.
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Old 11-06-2006, 03:17 PM
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smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,524
Are you sure the ring is seated properly around the headlamp? Is the new headlamp case thicker?

93 300SD
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Old 11-06-2006, 03:56 PM
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Join Date: Mar 2006
Posts: 545
Well I had some messing around until I realized that the retaining ring had to slide back over the grey plastic shroud around the headlight. Once that was done then I simply found that some of the screws would hold and some would not!

I measured the lights because I had exactly the same thought as you - are these new ones thicker - answer is no!

It's also a great time to clean off all the goop on the hood latches. It opens much more easily now!!
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