Cab light help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Thebrownturd · 04-24-2016, 10:35 AM

My truck has factory cab lights with the raised light perches and welded in nuts to screw to; however, when I attempted to take the screws out a while back a lot of them broke off in the nut. Some of the nuts even twisted out of the metal and I am left with a square hole. I know the problem lies in the fact that sheet metal screws were used instead of machined screws and a little rust doesn't help either.

Does anyone have any good ideas on a fix? The PO twisted some of them to the side and drilled new holes but the problem with this is they are all cockeyed and facing random direction.

Could I drill out the twisted off screws that stuck in the nut and use a larger screws? What about the large square holes that have nothing to screw to?
Thanks for any advice. I need to figure something out before we go to paint.

old Chevy guy · 04-24-2016, 11:38 AM

If you could drill the holes out well, as in close to the center, you could retap them.. As far as the square holes I would try and get some nuts and tack them in with a mig. That's what I would do ,I'm not sure how your fixed as far as welding equipment or skills. You used to be able to buy square nuts,not sure if the still sell such a thing anymore. Is it going to a body shop for paint,maybe they could weld up the holes with new nuts.

Thebrownturd · 04-24-2016, 11:45 AM

I would like to weld nuts in but I think the metal is to thin due to feeling around with my finger and the rust pits that are visible in the area.

Thebrownturd · 04-24-2016, 11:51 AM

Quote:

Originally Posted by old Chevy guy

If you could drill the holes out well, as in close to the center, you could retap them.. As far as the square holes I would try and get some nuts and tack them in with a mig. That's what I would do ,I'm not sure how your fixed as far as welding equipment or skills. You used to be able to buy square nuts,not sure if the still sell such a thing anymore. Is it going to a body shop for paint,maybe they could weld up the holes with new nuts.

I am painting it myself. I just worked out a deal with the collision center next to where I work trading some labor to use their booth and get some advice on painting.

**Jeff's bowtie's** · 04-24-2016, 11:55 AM

Try some JB weld fill the holes let it set up and drill a new hole not sure how it will work but worth a try if the metal is to thin to weld

Gromit · 04-24-2016, 05:50 PM

Just a reminder that left-handed drill bits can be helpful for drilling out stripped fasteners, provided you can get the drill bit started in the center of the bolt - probably not that easy in your case because you can't exactly whack that thin metal with a center punch..

I may not be using the right terminology.. these bits I'm thinking of spin counter-clockwise in stead of clockwise.

It sounds like it will still be a tough problem though.. maybe it would be easier in the long run to replace the roof skin?

budman k20 · 04-24-2016, 06:32 PM

The cab light screws were not originally sheet metal screws. I would drill out the nuts or cut them out and glue in a new nut, maybe try welding a new one to some sheet metal. From memory the screw size was 8-32 or 10-32. Use one of the lens to size up the screw. Good luck... time to get creative!

BLAZERMAN · 04-24-2016, 09:11 PM

I would try Rivnuts and the use machine screws.

vics stuff · 04-25-2016, 02:25 AM

Just thinking out side the box . Have you considered in drilling out all the nuts and installing the expander rubber type push in nut. As you tighten them up they draw up on the back side of the panel and pinching / sealing the hole . That is what they are using on all the lights and roof racks of today's vehicles. Might be worth looking into.
Vic

**special-K** · 04-25-2016, 06:28 AM

Quote:

Originally Posted by BLAZERMAN

I would try Rivnuts and the use machine screws.

That's what I would try. I would soak the stubs left and try to turn them out with vice grips.

Thebrownturd · 04-25-2016, 06:23 PM

Good news I guess. In trying to drill out the nuts with seized screws I accidentally just pushed the whole nut in. I ended up doing the same with the others, it didn't take much. I am thinking of a long u nut or something similar to go in the square hole from the center hole. I saw this method was used on some later model chevys that still were using the same style clearance lights.

04-24-2016, 10:35 AM	#1
Thebrownturd Registered User Join Date: Jun 2013 Location: Northern Nevada Posts: 233	Cab light help My truck has factory cab lights with the raised light perches and welded in nuts to screw to; however, when I attempted to take the screws out a while back a lot of them broke off in the nut. Some of the nuts even twisted out of the metal and I am left with a square hole. I know the problem lies in the fact that sheet metal screws were used instead of machined screws and a little rust doesn't help either. Does anyone have any good ideas on a fix? The PO twisted some of them to the side and drilled new holes but the problem with this is they are all cockeyed and facing random direction. Could I drill out the twisted off screws that stuck in the nut and use a larger screws? What about the large square holes that have nothing to screw to? Thanks for any advice. I need to figure something out before we go to paint.

04-24-2016, 11:38 AM	#2
old Chevy guy Registered User Join Date: Apr 2007 Location: Foster Rhode Island Posts: 1,176	Re: Cab light help If you could drill the holes out well, as in close to the center, you could retap them.. As far as the square holes I would try and get some nuts and tack them in with a mig. That's what I would do ,I'm not sure how your fixed as far as welding equipment or skills. You used to be able to buy square nuts,not sure if the still sell such a thing anymore. Is it going to a body shop for paint,maybe they could weld up the holes with new nuts.

04-24-2016, 11:45 AM	#3
Thebrownturd Registered User Join Date: Jun 2013 Location: Northern Nevada Posts: 233	Re: Cab light help I would like to weld nuts in but I think the metal is to thin due to feeling around with my finger and the rust pits that are visible in the area. Last edited by Thebrownturd; 04-24-2016 at 11:51 AM.

04-24-2016, 11:55 AM	#5
Jeff's bowtie's Senior Member Join Date: Jan 2015 Location: Kearneysville Wv Posts: 3,938	Re: Cab light help Try some JB weld fill the holes let it set up and drill a new hole not sure how it will work but worth a try if the metal is to thin to weld

04-24-2016, 05:50 PM	#6
Gromit Registered User Join Date: Jul 2015 Location: Central Coast, CA Posts: 500	Re: Cab light help Just a reminder that left-handed drill bits can be helpful for drilling out stripped fasteners, provided you can get the drill bit started in the center of the bolt - probably not that easy in your case because you can't exactly whack that thin metal with a center punch.. I may not be using the right terminology.. these bits I'm thinking of spin counter-clockwise in stead of clockwise. It sounds like it will still be a tough problem though.. maybe it would be easier in the long run to replace the roof skin?

04-24-2016, 06:32 PM	#7
budman k20 1972 K20 Join Date: Apr 2008 Location: Greenfield MN Posts: 360	Re: Cab light help The cab light screws were not originally sheet metal screws. I would drill out the nuts or cut them out and glue in a new nut, maybe try welding a new one to some sheet metal. From memory the screw size was 8-32 or 10-32. Use one of the lens to size up the screw. Good luck... time to get creative!

04-24-2016, 09:11 PM	#8
BLAZERMAN Currently Blazerless Join Date: Apr 2000 Location: St. Joseph Mo. Posts: 4,826	Re: Cab light help I would try Rivnuts and the use machine screws. __________________ 1972 C/30 133" W.B. C&C 1970 GMC 3500 157" W.B. single wheel C&C

04-25-2016, 02:25 AM	#9
vics stuff Registered User Join Date: May 2011 Location: Reno Nevada Posts: 380	Re: Cab light help Just thinking out side the box . Have you considered in drilling out all the nuts and installing the expander rubber type push in nut. As you tighten them up they draw up on the back side of the panel and pinching / sealing the hole . That is what they are using on all the lights and roof racks of today's vehicles. Might be worth looking into. Vic

04-25-2016, 06:23 PM	#11
Thebrownturd Registered User Join Date: Jun 2013 Location: Northern Nevada Posts: 233	Re: Cab light help Good news I guess. In trying to drill out the nuts with seized screws I accidentally just pushed the whole nut in. I ended up doing the same with the others, it didn't take much. I am thinking of a long u nut or something similar to go in the square hole from the center hole. I saw this method was used on some later model chevys that still were using the same style clearance lights.



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