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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Oct-28-2018, 09:21:55 PM   #11
L0ADED
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Default Re: Engine noise - need experienced opinions

It sounds similar to the clutch release bearing if it were a manual and one depressed the clutch to make the sound go away. Otherwise, possibly the alternator bearing.
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Old Sun, Oct-28-2018, 10:03:54 PM   #12
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Default Re: Engine noise - need experienced opinions

I am with Gizmo. It sounds like the air cond compressor clutch kicking on and off.
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Old Sun, Oct-28-2018, 11:57:32 PM   #13
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Default Re: Engine noise - need experienced opinions

Thanks for all the comments. ///M3 MD, thanks, haven't had the pan off so haven't looked at bearings during my ownership and no lights. Thanks for the other comments as well. Had both belts off and it sounded the same. Have to experiment more with revving but believe it's still there. I haven't listened to the gearbox - need to get it on the lift and see if I can pick something up with a stethoscope. It does sound like a rub/grind. Anyone ever have a timing chain guide go at the bottom make this sort of sound? Odd that it periodically stops too.

Thanks for all the suggestions / thoughts. Keep 'em coming.
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Old Mon, Oct-29-2018, 12:05:06 AM   #14
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Default Re: Engine noise - need experienced opinions

You don't need stethoscope per se. A long screwdriver with hard handle put up to your ear works in a pinch.




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Old Fri, Jan-24-2020, 01:32:57 AM   #15
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Default Re: Engine noise - need experienced opinions

Wanted to share the final resolution on this one. Turns out it was the throwout bearing. Have no idea what caused it to go, but it went. Back together (along with a new clutch and flywheel) and all is well.
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Old Fri, Jan-24-2020, 01:33:55 AM   #16
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Default Re: Engine noise - need experienced opinions

Wow, just realized how long ago I originally posted this - better late than never.
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Old Fri, Jan-24-2020, 02:12:26 AM   #17
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Default Re: Engine noise - need experienced opinions

Quote:
Originally Posted by ebg338 View Post
Wanted to share the final resolution on this one. Turns out it was the throwout bearing. Have no idea what caused it to go, but it went. Back together (along with a new clutch and flywheel) and all is well.
I don't remember, but what pressed the TOB to constantly riding on the PP? A spring in the clutch fork or a spring pulled the pedal down?
On the bad bearing, did pressing down on pedal cause more noise or less, and how did you pin point to the TOB?
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Old Fri, Jan-24-2020, 02:25:57 AM   #18
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Default Re: Engine noise - need experienced opinions

It's an smg so couldn't push the clutch in. The sound started intermittent - at idle the sound would be there, then be gone for a few seconds, then come back. Over time it became more continuous. Shop that fixed it for me didn't indicate they knew what the cause of the bearing failure was - nothing obvious. Car has a little over 100k on it. Over the 50k miles I've owned it it was never tracked or abused, mainly highway miles. Odd that it failed.
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Old Fri, Jan-24-2020, 02:29:38 AM   #19
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Default Re: Engine noise - need experienced opinions

Pinpointed that it was the throwout bearing by pulling the trans.

Initially I thought the sound may have been coming from the bottom of the engine. Car was due for rod bearings so took it to the shop to have that done and figure out what was causing the grinding. Engine was all good so once they completed the rod bearings they focused on the trans.
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Old Fri, Jan-24-2020, 02:30:11 AM   #20
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Default Re: Engine noise - need experienced opinions

And bingo - bad throwout bearing.
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Discussing Engine noise - need experienced opinions in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)