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#1
07-02-12, 01:22
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So today the students were test fitting a headlight, but it seems to not fit correctly and I know that they did fit when the vehicle was first dropped off. They seem to be sticking out a bit too much, especially compared to the original pictures. Any ideas what is wrong?
     
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#2
07-02-12, 01:50
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The pattern in the lens appears to be twisted compared to the original. I can think of 3 possible causes for this. Either the headlight buckets are twisted in the nose assembly of the truck, the inner part of the bucket is twisted with respect to the outer or the sealed beam is twisted in the bucket assembly.
The outer bucket is assymetric (as is the cutout in the truck's nose) and should only be possible to install correctly with one adjusting screw at the top and the other on the side. Check carefully to be sure the correct screw is at the top. I don't recall whether the sideways screw is on the left or right. Similarly the layout of adjusting screws and tension springs should only let the inner bucket fit nicely in one orientation in the outer bucket. The inner bucket should ride smoothly on the rounded inner rim within the outer bucket. Finally, it should only be possible to fit the bulb one way in the inner of the bucket due to the mounting lugs on the back of the sealed beam needing to fit into recesses on the inner bucket. Any other orientation will make the bulb sit unevenly (and twisted) with only one lug in its recess or possibly just sit far forward in the bucket, not well restrained in rotational alignment. In your "after" photo the securing screw is at the top of the exterior (rounded) trim ring, in the "before" photo it is at the bottom. I believe the bottom is "normal".
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#3
07-02-12, 03:47
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Strange medical condition....
.....bulging eye ball is usually a thyroid problem....
....but would never occur on a Chev...
__________________
Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada
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#4
07-02-12, 06:27
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wow, I'm so confused...and I feel like I should go to the doctors now
I keep trying to read Grant's message and just keep getting confused Joel
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#5
07-02-12, 12:27
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Yes, I have that effect on some people. Sometimes I confuse myself too.
Basically I'm starting from the belief that the embossed lines in the lens of the sealed beam should be mainly horizontal or vertical. Having them at an angle, as shown in the "after" photo means something is out of alignment. Most of the parts should fit together better in one orientation than others (if done gently). This page http://www.tocmp.com/manuals/GMC/195...p30049_jpg.htm shows the headlight of a later GMC. the orientation of the lens lines should be similar and the positioning of the adjusting and retaining screws should also be similar. Does this clear any of the mud?
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#6
07-02-12, 21:17
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Behind the scene....
Hi Joel
Have a look at the back of the glass bulb..... it should have three raised alingment tabs raised and molded as part of the glass. It is possible these raised glass alignment tabs are not resting properly into the metal cup/bowl...... or your bowl may not have the necessary cut out ofr the raised tabs..... Let me know what you find.... Bob
__________________
Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada
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#7
07-02-12, 23:19
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Bob to the rescue ....translating my gibberish into his own version of Franglais.
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