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10-14-2021, 11:50 PM | #1 |
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Previous owner glued shift knob
Spent what felt like an eternity struggling with shift knob of the z before giving up with a bruised ego. I took a closer look under the shift knob and found that one of the previous owners applied a blob of jb weld under it.
Any ideas on how to get the thing off other than using it as a good excuse for a short shifter? |
10-15-2021, 12:58 AM | #2 |
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10-15-2021, 01:48 PM | #3 |
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Previous shop that did a clutch on my M epoxied the knob back on.
Destroyed it with a dremel. No other way to get it off in my experience. Could have saved the shift arm if I wanted to - put a UUC and ZHP knob in anyways. |
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10-16-2021, 08:37 AM | #4 |
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Good point on what gets destroyed in removal attempts. Start by carving up the shift knob, it's far easier to replace. Having said that, I'll also say that the AutoSolutions SSK has been the best thing I've done to my Moupe.
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10-16-2021, 04:24 PM | #7 |
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Drives: Porsche 993
Join Date: Mar 2020
Location: Dog Lake, South Frontenac, Ontario Canada
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10-18-2021, 03:35 AM | #9 | |
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A liittttlllee bit worried about taking a dremel to the shifter for now. The only difference between the current one and the replacement one is just the lights. Probably not worth all of the shifter dust I'll have to clean out. Will probably just rip it off with some clamps after replacing it with the ssk when that eventually happens! |
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10-18-2021, 06:47 AM | #10 |
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If you know what sort of glue was used, you could try contacting the manufacturer to see if they can recommend a solvent to loosen the glue.
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10-18-2021, 07:45 AM | #11 |
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Yikes:
https://www.jbweld.com/faqs HOW CAN I REMOVE J-B WELD AFTER IT IS FULLY CURED? When fully cured, J-B Weld can only be removed by grinding or filing it off, or by directly heating the product above the 600º maximum temperature threshold. |
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10-18-2021, 07:50 AM | #12 |
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10-18-2021, 01:18 PM | #13 | |
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mine currently keeps detaching at the very moment you'd need it most. A short shifter kit is waiting in the garage and I've got all the parts ready but I don't have time right now to work on it |
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10-19-2021, 03:01 AM | #14 | |
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11-19-2021, 10:55 PM | #15 |
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If not glue, then....??
I was almost in a similar situation. The shifter on my Z4 started becoming a little loose. Dealer offered to glue it on for me. I ended up getting a replacement knob, and when I went to take off the original, the plastic retaining ring all just about disintegrated. The original knob matches the tan leather interior perfectly. If I wanted to reattach it, what would be the best way to go about it without ending up with a glued-on knob?
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11-28-2021, 11:50 AM | #16 | |
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So all BMW manual transmission shift knobs snap onto the gearshift shaft. There is a slot milled into the top of the shaft that fits an internal block molded into the top of the interior of the shift knob cylinder. The fit between the slot in the shaft and the block in the knob cylinder is known as an interference fit, where the block slightly deforms as it is snapped into the slot. Over time and use, the plastic degrades and eventually the knob becomes loose and can pop off the shaft when shifting from 1st to 2nd, or 3rd to 4th. It is a classic issue with BMW manual transmissions, because the plastic block eventually starts to break away from the top of inside of the knob's cylinder. The only non-damaging repair is to replace the shift knob with a new OE BMW shift knob. Non-professional repairs, which the subject of this thread is about, some dumbass uses an adhesive to affix the old broken knob to the shift lever shaft. This type of repair ruins the original intended design of the knob fitment. Again, the only correct repair is to replace the knob with new original equipment BMW knob. There are aftermarket knobs that solve the problem. I use a Momo shift knob to replace the BMW OE knob, even on new a BMW, because the knob breaks and slips off eventually. Momo uses three small pointed set screws to affix the knob to the shaft. Other brands use other mechanical methods as well.
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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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