Gear rattle in neutral

JoeFromPA · 12-11-2014, 07:39 PM

Hi all,

6mt here. I've noticed at various times at a stop, in neutral, clutch pedal out I'm getting a rotating, rattling sound from the trans area. Goes away immediately upon clutch pedal in.

Only happens occasionally. 99% certain this is simply gear rollover noise.

Just wanted to share this as I'm sure it'll pop up elsewhere at some point. Some vehicles due to gear design/flywheel design and even trans fluid properties will produce this noise. I haven't experienced it before like this, but wanted to share that I was getting it infrequently but on numerous occasions now.

My guess is it's exacerbated by the cold weather.

AMPowerJ · 12-11-2014, 08:25 PM

Lightweight flywheel chatter ...

A good article on this from my E36 M3 days ....

http://www.uucmotorwerks.com/flywheel/gear_rattle.htm

RingMeister01 · 12-12-2014, 08:29 AM

Yup flywheel rattle. Sounds great doesn't it? Not kidding.

JoeFromPA · 12-12-2014, 11:17 AM

Huh, sounds different to me than what I've heard before as a lightweight flywheel noise. Also, it's not consistent so this flywheel must be right on the edge of damping vs. lightweight design.

When I hear it, it has sounded different each time. Sometimes it's literally sounded like a vacuum line. Sometimes the consistent rotating rattle (which I associate with flywheel noise). Sometimes a light whine like a TOB whine.

However, it's very consistent that it's at idle and goes away as soon as the clutch pedal is pushed in - so it's def rollover noise

12-11-2014, 07:39 PM	#1
JoeFromPA Colonel 1796 Rep 2,997 Posts Drives: '15 AW M3 6MT Stripper Join Date: Aug 2013 Location: SE PA iTrader: (0)	Gear rattle in neutral - sometimes Hi all, 6mt here. I've noticed at various times at a stop, in neutral, clutch pedal out I'm getting a rotating, rattling sound from the trans area. Goes away immediately upon clutch pedal in. Only happens occasionally. 99% certain this is simply gear rollover noise. Just wanted to share this as I'm sure it'll pop up elsewhere at some point. Some vehicles due to gear design/flywheel design and even trans fluid properties will produce this noise. I haven't experienced it before like this, but wanted to share that I was getting it infrequently but on numerous occasions now. My guess is it's exacerbated by the cold weather. __________________ AW/Carbonstructure 6MT 2015 M3 picked up 8/22/2014. Stripper except for adaptive suspension. Weighed at 3,450 pounds with 1/4 fuel. 70,000 miles as of February 2020.
	Appreciate 0 Tweet Quote

12-11-2014, 08:25 PM	#2
AMPowerJ One mod leads to another ... 416 Rep 2,900 Posts Drives: 2014 F10 M5 Join Date: Apr 2008 Location: Blythewood, SC iTrader: (10)	Lightweight flywheel chatter ... A good article on this from my E36 M3 days .... http://www.uucmotorwerks.com/flywheel/gear_rattle.htm __________________ Current: 2014 F10 M5 Previous: 2015 F80 M3, 2013 E92 M3, 2013 F10 M5, 2009 E90 M3, 1998 E36 M3
	Appreciate 1 Quote

12-12-2014, 08:29 AM	#3
RingMeister01 Croatian 884 Rep 3,613 Posts Drives: PORSCHE Join Date: Dec 2012 Location: NYC iTrader: (0) Garage List '18 Panamera Turbo [0.00] '17 991.2 Carrera G ... [0.00]	Yup flywheel rattle. Sounds great doesn't it? Not kidding. __________________ NARDO GREY '18 PANAMERA TURBO Ducati V4 S Corse (track only) Husqvarna FS450 (track only) Looking for an SUV
	Appreciate 0 Quote

12-12-2014, 11:17 AM	#4
JoeFromPA Colonel 1796 Rep 2,997 Posts Drives: '15 AW M3 6MT Stripper Join Date: Aug 2013 Location: SE PA iTrader: (0)	Huh, sounds different to me than what I've heard before as a lightweight flywheel noise. Also, it's not consistent so this flywheel must be right on the edge of damping vs. lightweight design. When I hear it, it has sounded different each time. Sometimes it's literally sounded like a vacuum line. Sometimes the consistent rotating rattle (which I associate with flywheel noise). Sometimes a light whine like a TOB whine. However, it's very consistent that it's at idle and goes away as soon as the clutch pedal is pushed in - so it's def rollover noise
	Appreciate 0 Quote