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  #1  
Old 01-19-2014, 10:51 AM
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Location: Modesto, CA
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Drilling screw in 91 sl panel removal

I am having a door lock problem after a new lock actuator was installed by a local shop. I am attemping to remove the panel to check the vacuum line. When I removed the front pocket screw I found a very large machine screw that was very hard to remove. The back screw was stripped, ie, it would turn but not unscrew out or in. I tried a lever to push the panel against the screw to no avail. This back screw is buried in the panel plastic about 1.5 in.
Then I attempted to drill out the screw head. I have used bosch titanium drills and a home depot colbalt drill. These bit are not able to drill through this head. I have a little progress but it is not progressing.
Any ideas on how to procede? Thanks in advance for any ideas.

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  #2  
Old 01-19-2014, 03:16 PM
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If you just paid to have it installed, why are you working on it ?
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  #3  
Old 01-19-2014, 05:26 PM
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What size drill bit are you using? Start with a stubby 1/8" diameter to get a pilot hole going.
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  #4  
Old 01-19-2014, 06:20 PM
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take it back to the shop. You should check the work order for warranty. If you tamper with it, it might void your warranty.
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  #5  
Old 01-19-2014, 08:17 PM
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not so smart move

You are right. I got delayed with an upholstery and carpet job on my porsche. The top is still out. I was trying to determine the status of my vacuum pump before taking it back to the shop. Too many $1000 shop bills.
I should not have started drilling. I am going to try a smaller drill however i need length to keep the drill out of the panel upholstery.
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  #6  
Old 01-19-2014, 10:43 PM
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OK, use a high sped drill ( 1,200 RPM would be good ) and don't push too hard as a long bit will break. Also, don't let things get too hot as it will melt plastic.

For max speeds see this chart.
www.imperialsupplies.com/pdf/I_Drill-Bit_PRMChart.pdf
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  #7  
Old 01-20-2014, 11:16 PM
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Smile making progress

I took your advice on starting with a smaller drill size. The bosch titanium bits were not tough enough. I bought some dewalt cobalt drill bits today and I think I have gone through the head. I will pull the panel tomarrow to see what kind of mess I have to clean up. more later.

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