Throttle body fastener problems.

[Onyx823]

So I removed the throttle bodies yesterday with plans to refurb the DK motors today. I go to start disassembly on the units and the "screws" I come across are some kind of one way security screw. Not sure if anyone has seen these before or know what kind of bit I need to remove them. Can't find much info for this particular type of head anywhere on the internet.

I would guess these are obviously not the original screws for it. The throttle bodies were definitely removed before as when I removed them there was no gasket in place and some type of sealant instead.

Anyway if anyone has any ideas let me know.

At this point i feel like just using a dremel to cut a slot into each one and try to get them out that way

20201115_110010.jpg20201115_110017.jpg



EDIT - the writeup I have is for the E38 so maybe that's why I am not seeing the same screw?

looks like this one i found on ebay has the same screws as mine, which is from an E31

https://www.ebay.com/itm/BMW-E31-E38...-/143574193509

[clockwork]

Use vice grips (as many others have had to in the past) and yes I believe they are the original security screws from Factory.
You could replace with another type of screw, once being put back together.


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[Onyx823]

Thanks, I was trying that but they are in there pretty tight and the grips are marring it before it even budges it at all

[rjjablo]

Vice Grips are the tool of Choice here. Mine were on pretty Good. Allen head either button or Socket are a good choice for replacement. You could go all German and do TORX

[jclausen]

Or you might be able grab the edge of the bolt with a sharp chisel

[Timm]

This procedure I saved from a defunct site a while ago mentions Phillips or security screws:

http://www.meeknet.co.uk/e38/Recondi...hrottle-DK.pdf

[Onyx823]

Timm I did see that. Thanks. I eventually got them with vice grips. Refurb is all done and the units are back together. I didn't feeling like running down to the hardware store to sort through bolts today so I used a spanner bit to get the security screw back in. If I have to do this again in the future then I will change them out to phillips or torx heads.




Thanks you all for your input.

- - - Updated - - -

Or you might be able grab the edge of the bolt with a sharp chisel

You can certainly tighten them that way... I used a spanner bit to get them back in. But they only have something to grab onto in one direction(tight). I eventually got them out using vice grips

[dragon850]

Cut the grooves into the screw , then replace them after.
Do not touch the encoder wipers!!

[Onyx823]

Cut the grooves into the screw , then replace them after.
Do not touch the encoder wipers!!

When synching the DK motors after installation, do you only have to disconnect the driver side battery?

[Timm]

No, the batteries are wired in parallel - disconnecting one would make no difference! Disconnect both battery negatives and leave the positives alone.