924Board.org

[gml]

Picture: https://imgur.com/a/xcfLmuD

The bolt on the rear trailing arm broke off when removing the drum brake backing plate. I drilled this out and tried using an EZ out (bolt extractor) but I haven’t been able to get it out yet. I used a tap handle to screw the EZ out but the chuck of the tap handle broke instead.

It is drilled out a little bit off center so I’m worried if i use a larger drill bit I will destroy the threads, and if I need to remake threads with a helicoil the hole won’t be centered properly.

What would you do in this situation?
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George

1982 924 NA 5-speed

[Riggard]

I'd use a Dremel with a metal burr and see if you can reduce the hole of the old bolt a bit further, so that basically only the threads remain. After that remove the remaining piece with a small iron pick.


Alternatively you could also try torching the remainder red hot, it may come loose.

[safe]

You seam to have drilled the hole pretty centered and big. You may be able to pick the threads or knock them out with a sharp punch.
A tap might be able to grab and turn the remains out the right way.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe

[ChrisMadge]

It needs to be perfectly centered, which is easier said than done.

In the past i have used a set of needle/round files to carefully enlarge an off center hole to the point where you can pick out the remaining threads with a pick and run a tap through. Time consuming but it works.
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1984 MY 924 2.0 NA
1975 MG Midget