Is my clutch going out?

scbim · 08-12-2023, 01:41 AM

107k N54 335i. Over revs when I floor it and lug the engine a bit, pretty much any gear but 1st. Revs increase quickly (inconsistent with power) and dip back down before acceleration resumes at a normal pace. RPMs seem consistent when I don't WOT til' 4k+

***Uploaded clip to Vimeo but can't get it to render in this forum's preview. I'll leave the link below in case it renders for others...

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NikMN · 08-12-2023, 07:42 AM

Slipping clutch will smell like overheated brake pads

Brian86 · 08-12-2023, 11:06 AM

Yup, that's a smoked clutch.

scbim · 08-12-2023, 11:24 PM

I tried slowly letting out the clutch from a stop in 1st and the car pulled forward which made me think it might not be the clutch. The clutch pedal itself also feels fine though I do get intermittent creaking (sounds like its coming from the linkage, not the pedal). Not sure what else it could be but I'd like to rule everything out before committing to such an expensive repair.

NikMN · 08-13-2023, 02:06 AM

Clutch kit and new flywheel. Replacing while you at it parts is not a bad idea

scbim · 08-16-2023, 10:50 PM

Quote:

Originally Posted by NikMN

Clutch kit and new flywheel. Replacing while you at it parts is not a bad idea

I'll definitely replace most of the shifter linkeage while I'm down there. What's your logic for recomending the flywheel replacement?

NikMN · 08-17-2023, 05:23 AM

Went through all of this year ago. Not every of shop can resurface dual mass flywheel. Check with your indi first.

scbim · 08-24-2023, 08:02 PM

Quote:

Originally Posted by NikMN

Went through all of this year ago. Not every of shop can resurface dual mass flywheel. Check with your indi first.

Good idea, I was gonna go ahead and just replace it but could likely save a ton of cash if I can get it resurfaced.

My mechanic buddy drove the car the other day and said it's hotspot on the flywheel that's causing the slip (because the surfaces re-mate on their own instead of continuing to slip which would indicate a burned clutch).

scbim · 09-13-2023, 04:36 AM

Learned it's pretty difficult to resurface a dual mass fly wheel. Apparently they're riveted together so it takes a very special shop to tackle it. Shame, those things 'aint cheap.

CLEAN13BOOSTED · 10-08-2023, 07:20 PM

Quick tip, most OEM clutch's should engage/release mid pedal travel with a little bit (inch) of free-play in the pedal at the top (disengaged). If they're tight, engage right off the floor or at the top of pedal travel (no free-play) it's getting time to replace.

08-12-2023, 01:41 AM	#1
scbim cap 15 Rep 55 Posts Drives: 2007 BMW 335i Join Date: Jul 2022 Location: Santa Cruz iTrader: (0)	Is my clutch going out? 107k N54 335i. Over revs when I floor it and lug the engine a bit, pretty much any gear but 1st. Revs increase quickly (inconsistent with power) and dip back down before acceleration resumes at a normal pace. RPMs seem consistent when I don't WOT til' 4k+ **Uploaded clip to Vimeo but can't get it to render in this forum's preview. I'll leave the link below in case it renders for others... " width="800" height="450" frameborder="0"> Last edited by scbim; 08-13-2023 at 02:32 AM..*
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08-12-2023, 07:42 AM	#2
NikMN Private First Class 189 Rep 174 Posts Drives: BMW F10 n63tu Join Date: Oct 2022 Location: Minnesota iTrader: (0)	Slipping clutch will smell like overheated brake pads Last edited by NikMN; 08-12-2023 at 08:25 AM..
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08-12-2023, 11:06 AM	#3
Brian86 Captain 638 Rep 766 Posts Drives: e36 M3, e91 325xi, N50 Xterra Join Date: Dec 2020 Location: Pittsburgh iTrader: (0)	Yup, that's a smoked clutch. __________________ Sometimes a bolt is just a bolt.
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08-12-2023, 11:24 PM	#4
scbim cap 15 Rep 55 Posts Drives: 2007 BMW 335i Join Date: Jul 2022 Location: Santa Cruz iTrader: (0)	I tried slowly letting out the clutch from a stop in 1st and the car pulled forward which made me think it might not be the clutch. The clutch pedal itself also feels fine though I do get intermittent creaking (sounds like its coming from the linkage, not the pedal). Not sure what else it could be but I'd like to rule everything out before committing to such an expensive repair.
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08-13-2023, 02:06 AM	#5
NikMN Private First Class 189 Rep 174 Posts Drives: BMW F10 n63tu Join Date: Oct 2022 Location: Minnesota iTrader: (0)	Clutch kit and new flywheel. Replacing while you at it parts is not a bad idea Last edited by NikMN; 08-13-2023 at 02:21 AM..
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08-17-2023, 05:23 AM	#7
NikMN Private First Class 189 Rep 174 Posts Drives: BMW F10 n63tu Join Date: Oct 2022 Location: Minnesota iTrader: (0)	Went through all of this year ago. Not every of shop can resurface dual mass flywheel. Check with your indi first. Last edited by NikMN; 08-17-2023 at 04:14 PM..
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09-13-2023, 04:36 AM	#9
scbim cap 15 Rep 55 Posts Drives: 2007 BMW 335i Join Date: Jul 2022 Location: Santa Cruz iTrader: (0)	Learned it's pretty difficult to resurface a dual mass fly wheel. Apparently they're riveted together so it takes a very special shop to tackle it. Shame, those things 'aint cheap.
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10-08-2023, 07:20 PM	#10
CLEAN13BOOSTED Private First Class 74 Rep 104 Posts Drives: 2013 BMW E93 3351 Join Date: Oct 2023 Location: FLORIDA iTrader: (0)	Quick tip, most OEM clutch's should engage/release mid pedal travel with a little bit (inch) of free-play in the pedal at the top (disengaged). If they're tight, engage right off the floor or at the top of pedal travel (no free-play) it's getting time to replace.
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