Variable Belt Squeak (videos attached)

dsource · 03-28-2020, 03:39 PM

- History: Bought car back in Dec 19' crashed from copart. rebuilt the front end and did all maintenance to the n54, car is now FBO running hybrid twins. OFHG replaced no leaks as well. I dropped the sub frame and know for fact i tightened the bolts to the block holding the power steering pump (known to come loose) I replaced all pulleys, belt, and tensioner through FCP. I can get everything exchanged on warranty, but i've put less than 10k on the car since the rebuild.

Precursor

not the turbos rattling and no it's not the injectors)

The squeak originated in the last two months, it is variable by engine rpm, tested by having the clutch pressed in and varying rpm. Using a long screwdriver i held it close to the pullys and listened to determine if a pully had gone bad. All pulleys just hummed, the tensioner would click and visually can see it moving everso slightly. Videos are attached hopefully someone has had the same issue. Just don't want to suck in a belt. The videos filmed were done right after an oil change, started to squeak after 5 min the noise went away?

https://photos.app.goo.gl/DN5zghkBnbN8mU2e9

qnzfinest3593 · 03-29-2020, 08:17 PM

My car makes the same noise. 2013 335is. On a cold start it chirps and slight rpms increases the noise. Once car warms up it goes away. Ive had pulleys, tensioner, belt replaced and it got a bit quieter but still there. Drives me crazy.

WatchWolf34 · 03-29-2020, 11:00 PM

Did you do the alternator pulley when you replaced the rest of them?

clegg · 04-01-2020, 10:25 AM

The sources of squeak may come from the ac compressor, alternator or the belt itself. Maybe try a different mfg belt.

dsource · 04-08-2020, 12:27 PM

Ordered, a new alternator pully. I have a spare compressor if it has to come down to that.

WatchWolf34 · 04-09-2020, 11:51 PM

Let us know how it turns out! Do you have this tool?

https://www.fcpeuro.com/products/alt...4aAhsCEALw_wcB

dsource · 04-10-2020, 05:37 PM

No, i saw the 12 point, thought nothing of it, until i saw the larger inner spline. Looks like i've got to order that as well. I picked up this billet pully for the PS, just in case it is somehow worn or bent and it's $40 on ebay, while ecs tuning wanting to charge $33 for shipping...

Link: https://www.ebay.com/itm/113983945470

03-28-2020, 03:39 PM	#1
dsource Private 47 Rep 56 Posts Drives: e92 335xi + miata + tdi Join Date: Aug 2018 Location: Milwaukee, WI iTrader: (0)	Variable Belt Squeak (videos attached) - History: Bought car back in Dec 19' crashed from copart. rebuilt the front end and did all maintenance to the n54, car is now FBO running hybrid twins. OFHG replaced no leaks as well. I dropped the sub frame and know for fact i tightened the bolts to the block holding the power steering pump (known to come loose) I replaced all pulleys, belt, and tensioner through FCP. I can get everything exchanged on warranty, but i've put less than 10k on the car since the rebuild. Precursornot the turbos rattling and no it's not the injectors) The squeak originated in the last two months, it is variable by engine rpm, tested by having the clutch pressed in and varying rpm. Using a long screwdriver i held it close to the pullys and listened to determine if a pully had gone bad. All pulleys just hummed, the tensioner would click and visually can see it moving everso slightly. Videos are attached hopefully someone has had the same issue. Just don't want to suck in a belt. The videos filmed were done right after an oil change, started to squeak after 5 min the noise went away? https://photos.app.goo.gl/DN5zghkBnbN8mU2e9
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03-29-2020, 08:17 PM	#2
qnzfinest3593 New Member 0 Rep 9 Posts Drives: BMW 2013 335is Join Date: Mar 2020 Location: Long Island, NY iTrader: (0)	My car makes the same noise. 2013 335is. On a cold start it chirps and slight rpms increases the noise. Once car warms up it goes away. Ive had pulleys, tensioner, belt replaced and it got a bit quieter but still there. Drives me crazy.
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03-29-2020, 11:00 PM	#3
WatchWolf34 Because Racecar 126 Rep 266 Posts Drives: 2009 E90 335i 6MT Join Date: Sep 2016 Location: Minnesota iTrader: (1)	Did you do the alternator pulley when you replaced the rest of them? __________________
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04-01-2020, 10:25 AM	#4
clegg First Lieutenant 87 Rep 301 Posts Drives: 335i E92, 435i F32,X5 F15 Join Date: Apr 2019 Location: O'Fallon, MO iTrader: (0)	The sources of squeak may come from the ac compressor, alternator or the belt itself. Maybe try a different mfg belt.
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04-08-2020, 12:27 PM	#5
dsource Private 47 Rep 56 Posts Drives: e92 335xi + miata + tdi Join Date: Aug 2018 Location: Milwaukee, WI iTrader: (0)	Ordered, a new alternator pully. I have a spare compressor if it has to come down to that.
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04-09-2020, 11:51 PM	#6
WatchWolf34 Because Racecar 126 Rep 266 Posts Drives: 2009 E90 335i 6MT Join Date: Sep 2016 Location: Minnesota iTrader: (1)	Let us know how it turns out! Do you have this tool? https://www.fcpeuro.com/products/alt...4aAhsCEALw_wcB __________________
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04-10-2020, 05:37 PM	#7
dsource Private 47 Rep 56 Posts Drives: e92 335xi + miata + tdi Join Date: Aug 2018 Location: Milwaukee, WI iTrader: (0)	No, i saw the 12 point, thought nothing of it, until i saw the larger inner spline. Looks like i've got to order that as well. I picked up this billet pully for the PS, just in case it is somehow worn or bent and it's $40 on ebay, while ecs tuning wanting to charge $33 for shipping... Link: https://www.ebay.com/itm/113983945470 Last edited by dsource; 04-11-2020 at 10:52 AM..
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