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Lights a-bouncin'

Discussion in 'Technical Q&A' started by gatsby, Jul 18, 2005.

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  1. gatsby

    gatsby Karting

    Apr 26, 2005
    206
    half moon bay, CA
    Full Name:
    jim
    #1 gatsby, Jul 18, 2005
    328 lights work great otherwise, but really bouncy left headlight loves going disco up-n-down on me. Checked all the bolts, nuts and adjustment buckle and all are tight; tried to shake on the top of the light and notice a slight movement on the shaft of the lifting motor - does anyone know of any other bolts I can tighten around the light motor area?
     
  2. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
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    Malcolm W
    #2 Ferrari_tech, Jul 19, 2005
    Hi Jim - yes there are adjusters to stop this - I will post pictures later
     
  3. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,614
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    The Bad Guy
    #3 ernie, Jul 19, 2005
    Have a look at the back of the headlight housing. What you are looking for is a broken weld. The brackets on the back of my headlight housing (348) are only spot welds, and not welded the full legnth of the bracket. I had a couple of the spot welds break and it caused what you are talking about. So it may be the same deal for your car.
     
  4. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
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    Malcolm W
    #4 Ferrari_tech, Jul 19, 2005
    Last edited by a moderator: Sep 7, 2017
  5. gatsby

    gatsby Karting

    Apr 26, 2005
    206
    half moon bay, CA
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    jim
    #5 gatsby, Jul 19, 2005
    Splendid Malcolm & Ernie. Will dig in there again today and check both suggestions. Gentlemen & Scholars all!
     
  6. gatsby

    gatsby Karting

    Apr 26, 2005
    206
    half moon bay, CA
    Full Name:
    jim
    #6 gatsby, Jul 21, 2005
    Here's the update on what I found. Re-checked all the bolts and nuts on the light housing and all suggestions above. I narrowed the problem down to a small "rocking" of the arm that connects the turnbuckle (that moves the light up and down) and it turns out that the slotted hole in the arm has been worn to a point where the grooves are now smooth. No matter how much I tighten the nut down, there is a small rocking movement of this arm.

    What I need to do is to replace the lower part of Part #12 (where Part #18 (washer) goes into(Illustrated above). This is a metal arm with a hole that goes into the shaft of the headlight motor.

    Now goes the search for this part!
     
  7. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
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    Malcolm W
    #7 Ferrari_tech, Jul 21, 2005
    Jim,

    It is item twelve you want (top and bottom are the same) the part number is 61326200 and costs £35.30 plus shipping.
     
  8. ernie

    ernie Two Time F1 World Champ
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    Nov 19, 2001
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    The Bad Guy
    #8 ernie, Jul 21, 2005
    Glad to hear you got it figured out. Thanks for the update, as this will give others that encounter the same problem, something else to look for.
     
  9. jeremydixon

    jeremydixon Rookie
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    Nov 6, 2003
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    stockport cheshire
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    Jeremy Dixon
    #9 jeremydixon, Jul 22, 2005
    Hi Jim
    I think I have a few of those Item 13's hanging around, I shall have a look tonight and let you know you can e.mail me and I will reply ASAP.
    Jeremy
     
  10. jeremydixon

    jeremydixon Rookie
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    #10 jeremydixon, Jul 22, 2005
    correction item 12's
     
  11. gatsby

    gatsby Karting

    Apr 26, 2005
    206
    half moon bay, CA
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    jim
    #11 gatsby, Jul 22, 2005
    Thanks guys. I'll wait for your findings, Jeremy!
     
  12. gatsby

    gatsby Karting

    Apr 26, 2005
    206
    half moon bay, CA
    Full Name:
    jim
    #12 gatsby, Jul 28, 2005
    Last edited by a moderator: Sep 7, 2017
    Thought I'd share what I finally found was the culprit. Ferrari_UK_Tech's suggestion was right on the money. The second part #3 (bolt with rubber stop) located BEHIND the light compartment, accessible only by taking the front tire and removing the wheel well panels, was the reason the light was bouncing. The Rubber Stop on the top of the bolt was simply worn down on one side and I simply rotated the rubber stop so that the bracket in the light assembly would rest on it when the light is in the UP position.

    So now when the motor engages, the light assembly is pushed tightly against the rubber stop. Bouncing is gone. I did adjust Item #12 above to as best that I could, but the rubber stop was indeed the culprit!

    Thanks for all of your suggestions!!

    Pic below shows the rubber stop on the Driver's side light, photographed from the wheel well.
    Image Unavailable, Please Login
     

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