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BMW 3-Series (E90 E92) Forum
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GS6-53DZ-THGX Damaged input shaft bearing
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09-02-2021, 03:20 PM | #1 |
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GS6-53DZ-THGX Damaged input shaft bearing
Well, that didn't take long.
I was doing some logs on e50 after installing the walbro 535 yesterday (a few 1-2-3s), and it seems like I've damaged the input shaft bearing by shifting too hard, it now faintly whines when the clutch isn't pressed, engine speed and load dependent. Has anybody else done this? These transmissions were supposedly bullet proof, and 500wtq or so seems a bit low to damage these transmissions. It was perfectly happy with 93. Fluid was done 3 months ago 550i clutch done 3 months ago Clutch delay valve still installed It looks like these guys sell the bearings here so I'm gonna try to get mine rebuilt, but I don't particularly want this happening again.
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'20 AW F97 X3M | '10 AW E90 M3 DCT | '08 Karmesinrot E93 335i 6MT -> RB Twos | FBO | Tuned by Ken@Wedge | 550i Clutch | Walbro 535 | M3 Control Arms | PS4S
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09-02-2021, 10:51 PM | #2 | |
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What's the transmission rated at and are there guys running more than 500lb/ft torque at flywheel reliably ? Not sure what you mean by Bullet proof, every transmission can be damaged. |
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09-03-2021, 01:40 PM | #3 |
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Sure, I mean relative to other transmissions ours are *very* stout (I'm sure you've heard of some turbo LS/Supra cars running our boxes), so it surprised me when people run single turbo cars in the 650-700lbft range and beat the shit out of their transmissions much more than I do, my transmission is the one that shits the bed. Transmission is rated for 442 lb ft (600Nm) which is just under what I am making on my stockers, and by the time I am shifting I am making well under that number.
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'20 AW F97 X3M | '10 AW E90 M3 DCT | '08 Karmesinrot E93 335i 6MT -> RB Twos | FBO | Tuned by Ken@Wedge | 550i Clutch | Walbro 535 | M3 Control Arms | PS4S
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09-03-2021, 02:50 PM | #4 | |
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I found the ZF6 to be more reliable than the manual BMW transmissions from experience, but maybe that's just bone stock transmissions I've been driving in older cars. With uprated clutch and flywheel in good order they cam handle huge torque |
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09-03-2021, 10:08 PM | #5 | |
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'20 AW F97 X3M | '10 AW E90 M3 DCT | '08 Karmesinrot E93 335i 6MT -> RB Twos | FBO | Tuned by Ken@Wedge | 550i Clutch | Walbro 535 | M3 Control Arms | PS4S
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09-04-2021, 10:36 PM | #6 | |
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It doesn't matter how strong the gearbox is, if you shift badly, it's possible to damage any manual transmission. |
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09-05-2021, 01:21 AM | #7 |
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That's what I'm saying, it wasn't at all flat foot. I treat my gearbox much nicer than most people I know, I'm surprised they don't have dents in their consoles from how hard they punch into gear. When I'm shifting quickly like this, it's not with much force on the shifter, only it's quick and clutch actuation is shortly after on a factory BMW clutch designed for the gearbox. Meanwhile people with twin disc clutches and all that are beating the living crap out of theirs, absolutely banging gears...
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09-05-2021, 05:59 AM | #8 | |
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Have a read through this, https://www.e90post.com/forums/showthread.php?t=1750081 Guys on there saying 550 clutch isn't good for anything more than 500wtq If that's the case, you may also be pushing the clutch to its limits |
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09-05-2021, 10:17 AM | #9 | |
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09-05-2021, 12:54 PM | #10 | |
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09-06-2021, 01:17 AM | #11 |
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I don't have the tools (ZF has a monopoly on parts, tools, and manuals), but there really isn't anything else I can think of. It is directly tied to engine rpm and only happens under load (shaft deflection is causing it I think) in any gear. I can't think of anything else it would be besides the shaft gears whining, but that doesn't explain how dirty my almost-brand-new fluid was.
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05-11-2024, 12:55 AM | #12 |
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Can you finish this story for me please?
I have an M5 with a GS6-53BZ transmission making a similar noise and I want to investigate the input shaft bearing. Did you find a way to replace it? Did it work to eliminate the noise? Cost? |
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