C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Headlight Operation

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Old Sep 1, 2010 | 03:09 AM
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Default Headlight Operation

When i turn on the headlight the headlight spins and once it at open the motor keeps spinning then stops. same thing when i turn them off. it spins to close then motor keeps going then stops. their is no grinding noise whats so ever. is their a timing or adjustment? only the passanger side does it.
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Old Sep 1, 2010 | 06:14 AM
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Probably a sign that the motor needs new bushings - the old ones rot out and disintegrate. The part is cheap, but it will take a couple of hours to do the job. Search for headlight bushing, there's lots of info on here.
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Old Sep 1, 2010 | 07:11 AM
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Yup. Your internal Delrin bushings have turned to doody. Here's a pic of what they look like new.

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Old Sep 1, 2010 | 09:59 PM
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Originally Posted by onedef92
Yup. Your internal Delrin bushings have turned to doody. Here's a pic of what they look like new.

Cause of that thingy how much is that?
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Old Sep 1, 2010 | 10:19 PM
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You can get the 3 bushings at any auto parts store. Ask for the ones Ford used in their power windows for years, about $4 for all three. Here is a link that will help:
http://home.comcast.net/~zrjuan/headlight.html
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Old Sep 2, 2010 | 07:47 AM
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Search the Forum and use this link as a primer for help in replacing the headlight bushings.

http://www.corvettefever.com/howto/33098/index.html

It's a good Saturday afternoon "shadetree" project. The first side'll take you longer than the other side (climbing the learning curve, you see).
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Old Oct 20, 2010 | 11:55 AM
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replaced nylon gears in a 93 motor still runs for a short time..what controls the motor stop?
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Old Oct 20, 2010 | 01:21 PM
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I think the motor has a control timer where it cuts power after it stops. I would never just do the bushings. When I did it, I bought 2 sets although 1 headlight was having the problem.

It would open fully and the motor keep going for a few seconds and when you shut it, same thing after it was fully closed. Changed one and then the other. When I did the "good" one, I found that all the bushings were already elongated and starting to break. Both plastic gears changed to bronze gears. I don't want to do it half assed so I went with bushings and gears.
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Old Oct 21, 2010 | 01:27 PM
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Originally Posted by auroacobra
replaced nylon gears in a 93 motor still runs for a short time..what controls the motor stop?
You say you replaced the gears, but did you replace the Delrin bushings, too? They're the items that need replacing 99% of the time.
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Old Oct 21, 2010 | 01:29 PM
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Originally Posted by auroacobra
replaced nylon gears in a 93 motor still runs for a short time..what controls the motor stop?
The bushings. The motors sense tension when the stop limits on the headlight assemblies are reached, then cut the power.
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