 Bouncing Headlights, Light Show when driving at night! |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| ctc911ctc |
 May 29 2023, 08:16 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States 
 |
'74 2.0, 22K miles
When I drive at night the headlight use to bounce around like crazy - I tried to adjust and there was nothing left to adjust (See PIC) I rebuilt - powder-coated - the entire headlamp system, turned out nice. I ordered the adjusting bolts but they were no longer available. I recently found a pair within this forum (THANK YOU) and put them in. Here are the old ones - YIKES  I put the headlamp at TDC in it's rotation, then tightened the bolt against the bracket. No more LightShow! Headlamp is solid when it is turned on. |
   |
 
|
| SirAndy |
May 29 2023, 08:45 PM
Post
#2
|
|
Resident German Group: Admin Posts: 41,638 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Make sure you don't make it too tight, the bolt is just there to stop the vibration, it's not a hard stop and the headlight arm needs to be able to rotate freely.
Those old bolts look like they had some current run through them. Did you have a short in your electrical system? (IMG:style_emoticons/default/idea.gif) |
|
|
|
| ctc911ctc |
May 30 2023, 06:50 AM
Post
#3
|
|
Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
|
"A" current leak? More like a dozen,,,,,,
I am certain that the wiring harness is leaky (elevated resistances from old connectors, etc...., not sure about the shorts, New lights are LED, less current, less leaking perhaps..... replacing the connectors as I move through the car....... There is a definite voltage drop between the battery and the dashboard. the front junction box under the dash had a mouse family living in it when I arrived at the car - I have not rebuilt it yet..... Good observation - seems a little road salt and those electrons were catalyzed to run away.......never seen a bolt do that - good observation! As to too tight, went to TDC, adjusted the bolt so it sat on the bracket, gave it a quarter turn more, tightened the retaining nut and it goes up/down as smoothly as new...... BTW, do those headlamp motors ever go bad? They seem overbuilt and over-geared for the job,...... never looked at a car (no matter how bad) where they did not work.... Thank you Mr. Berkley! QUOTE(SirAndy @ May 29 2023, 08:45 PM)  Make sure you don't make it too tight, the bolt is just there to stop the vibration, it's not a hard stop and the headlight arm needs to be able to rotate freely. Those old bolts look like they had some current run through them. Did you have a short in your electrical system? (IMG:style_emoticons/default/idea.gif) |
|
|
|
| Cairo94507 |
May 30 2023, 07:39 AM
Post
#4
|
|
Michael Group: Members Posts: 9,759 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
|
I agree with SirAndy - Do not over tighten that stop. It should be just so it sits on the stop, the extra 1/4 turn may be too much. (IMG:style_emoticons/default/beerchug.gif)
|
|
|
|
| Mikey914 |
May 30 2023, 09:59 AM
Post
#5
|
|
The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
|
QUOTE(ctc911ctc @ May 30 2023, 05:50 AM) "A" current leak? More like a dozen,,,,,, I am certain that the wiring harness is leaky (elevated resistances from old connectors, etc...., not sure about the shorts, New lights are LED, less current, less leaking perhaps..... replacing the connectors as I move through the car....... There is a definite voltage drop between the battery and the dashboard. the front junction box under the dash had a mouse family living in it when I arrived at the car - I have not rebuilt it yet..... Good observation - seems a little road salt and those electrons were catalyzed to run away.......never seen a bolt do that - good observation! As to too tight, went to TDC, adjusted the bolt so it sat on the bracket, gave it a quarter turn more, tightened the retaining nut and it goes up/down as smoothly as new...... BTW, do those headlamp motors ever go bad? They seem overbuilt and over-geared for the job,...... never looked at a car (no matter how bad) where they did not work.... Thank you Mr. Berkley! QUOTE(SirAndy @ May 29 2023, 08:45 PM) Make sure you don't make it too tight, the bolt is just there to stop the vibration, it's not a hard stop and the headlight arm needs to be able to rotate freely. Those old bolts look like they had some current run through them. Did you have a short in your electrical system? (IMG:style_emoticons/default/idea.gif) Yes they do but rarely. We had a used one we used in the testing of our relays. Went bad at about 300,000 cycles, put the other one on and it out lasted the 1st. In all fairness our test ran 8-9 hours a day for months (they did get weekends and holidays off), so I'd say they were well engineered. Yes, they will probably outlast all of us. |
|
|
|
| r_towle |
May 30 2023, 10:16 AM
Post
#6
|
|
Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
WTF....
Fix the electrical issues. those Bolts should be framed up and hung in the garage... |
|
|
|
| Root_Werks |
May 30 2023, 10:20 AM
Post
#7
|
|
Village Idiot Group: Members Posts: 8,319 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
|
Those bolts look like sacrificial anodes!
|
|
|
|
| ctc911ctc |
May 30 2023, 10:24 AM
Post
#8
|
|
Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
|
Agree Mr. Towle, wonderful art - they are going next to the 1st gear Dog Teeth ring which was ground down to nothing.........
QUOTE(r_towle @ May 30 2023, 10:16 AM) WTF.... Fix the electrical issues. those Bolts should be framed up and hung in the garage... |
|
|
|
| r_towle |
May 30 2023, 10:26 AM
Post
#9
|
|
Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
please recall, I have a bunch of parts if you need something.
Not sure where things are all stored...but I have stripped more than a few cars....so I have odd little things if you need anything. Rich |
|
|
|
| bkrantz |
May 30 2023, 07:12 PM
Post
#10
|
|
914 Guru Group: Members Posts: 7,763 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
|
QUOTE(SirAndy @ May 29 2023, 08:45 PM) Make sure you don't make it too tight, the bolt is just there to stop the vibration, it's not a hard stop and the headlight arm needs to be able to rotate freely. Those old bolts look like they had some current run through them. Did you have a short in your electrical system? (IMG:style_emoticons/default/idea.gif) More like current plus submerged in salt water! |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 16th May 2024 - 04:23 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.