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BMW 3-Series (E90 E92) Forum
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Rotor Set Screw Disaster
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01-11-2020, 12:55 PM | #23 | |
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I see the reason for wheel studs if you are racing, but with a street car maybe a bit overkill, and I'm leery of the studs loosing torque over time. Seems like extra work to check the torque on the studs, then put the nuts down to 88 lb.-ft.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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01-11-2020, 01:01 PM | #24 | |||
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01-11-2020, 01:24 PM | #25 |
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Best tool for stubborn rusted screws like rotor hold down is a manual hammer driven impact driver, like this one (I own a different one, just putting the link as example):
https://www.homedepot.com/p/TEKTON-3...E&gclsrc=aw.ds |
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01-11-2020, 01:26 PM | #26 | |
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01-11-2020, 01:36 PM | #27 | |
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![]() If you really had to remove the screw, drilling out from behind would be easiest as mentioned already, but as mentioned already too, that screw is not functional. It only aids during assembly, many cars don't use it. As long as the surface is flat for the rotor to seat on, you don't need to remove what is left there. |
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01-11-2020, 01:38 PM | #28 | ||
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01-11-2020, 01:42 PM | #29 |
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Also for future reference, drilling out a screw/bolt with a left handed drill bit can be better than using an extractor. Because most often the left handed drill bit will grab and remove the fastener during drilling.
If you go from behind, right handed (regular) drill bit will do the same. Harbor Freight has a set which is very decent quality in my experience: https://www.harborfreight.com/left-h...-pc-61686.html For corroded fasteners you need: - Heat - Hammer/Impact/Shock - Patience - Persistence - Penetrating oil Never use brute force, especially steady state applied, something breaks instead of getting loose. |
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01-11-2020, 02:18 PM | #30 | |
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01-11-2020, 03:23 PM | #31 |
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It can be drilled out, you just need a very expensive drill bit & some drill oil.
You need an Omega Drill bit That's what is used to drill out broken taps. Then you will need to tap the new hole & find a screw to fit it |
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01-11-2020, 03:33 PM | #32 | |
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I own many things to get it done. left twist drill bits are the first thing you do when you've committed to drilling a bolt out. extractors are the absolute last resort, because as you found out, they break off and now you've got hardened metal in there. see here for tips. |
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01-11-2020, 05:22 PM | #33 | ||
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01-12-2020, 06:22 PM | #35 |
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Drives: 335i e93, x3 e83, 328i e90
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when I changed rotors in my son’s 2008 328i I had to drill through the head on all four wheels. I did not attempt to remove or replace any of the set screws. They are not a necessity and I did not want to deal with an issue again of them rusting up like that and not being able to remove them.
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01-12-2020, 07:23 PM | #37 |
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01-13-2020, 09:04 AM | #38 |
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Try a rescue bit for all these applications
Try a rescue bit for this kind of application.
https://www.amazon.com/dp/B00B1E5APO...v_ov_lig_dp_it It's expensive but quite a few people seem to stand by it. The key with rescuebit is to not push the bit too much but move it in a circular fashion to keep expanding the hole. |
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01-13-2020, 10:06 AM | #39 | |
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