Drive Belt tensioner pulley bouncing

kokiignatov · 10-09-2023, 02:57 AM

Hi guys ,

The car is 535 xd . I replced the drive belt together with the tensioner after the old one got torn but noticed the tensioner pulley bouncing too much ONLY when A/C is running . What could be the reason ? Here is a general pic of the pulleys

ChiltiCoatl89 · 10-09-2023, 03:53 AM

Everything is snug and torqued to specification?

kokiignatov · 10-09-2023, 04:18 AM

In fact no . There are two bolts for the tensioner but didn use the the torque wrench. Anyway they are pretty tight .

ChiltiCoatl89 · 10-09-2023, 04:46 AM

Care to send a video?

kokiignatov · 10-09-2023, 04:51 AM

I made a video . Not sure i can upload it in the thread.

ChiltiCoatl89 · 10-09-2023, 05:09 AM

Be sure to read the terms carefully, and we do have a photo/video media thread.

kokiignatov · 10-09-2023, 10:30 AM

I uploaded on youtube and paste it here . Is that ok ?

https://youtube.com/shorts/pJvmOpgCW...2--mQxBV-Talkv

NikMN · 10-10-2023, 04:39 PM

New belt can cause tensioned to bounce in the beginning because they are stored/shipped folded. I would check each pulley to make sure it spins true. Ether take the belt off or check with engine running (keep hands and objects away) it will smooth out if everything was installed correctly

10-09-2023, 02:57 AM	#1
kokiignatov New Member 2 Rep 10 Posts Drives: F11 535 xd , E28 520i Join Date: Dec 2020 Location: Bulgaria iTrader: (0)	Drive Belt tensioner pulley bouncing Hi guys , The car is 535 xd . I replced the drive belt together with the tensioner after the old one got torn but noticed the tensioner pulley bouncing too much ONLY when A/C is running . What could be the reason ? Here is a general pic of the pulleys Attached Images
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10-09-2023, 03:53 AM	#2
ChiltiCoatl89 Lieutenant 1769 Rep 435 Posts Drives: 2016 F10 BMW 535i M Sport Join Date: Jun 2023 Location: Nevada iTrader: (0) Garage List 2016 BMW 535i M Sport [8.34]	Everything is snug and torqued to specification?
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10-09-2023, 04:18 AM	#3
kokiignatov New Member 2 Rep 10 Posts Drives: F11 535 xd , E28 520i Join Date: Dec 2020 Location: Bulgaria iTrader: (0)	In fact no . There are two bolts for the tensioner but didn use the the torque wrench. Anyway they are pretty tight .
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10-09-2023, 04:46 AM	#4
ChiltiCoatl89 Lieutenant 1769 Rep 435 Posts Drives: 2016 F10 BMW 535i M Sport Join Date: Jun 2023 Location: Nevada iTrader: (0) Garage List 2016 BMW 535i M Sport [8.34]	Care to send a video?
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10-09-2023, 04:51 AM	#5
kokiignatov New Member 2 Rep 10 Posts Drives: F11 535 xd , E28 520i Join Date: Dec 2020 Location: Bulgaria iTrader: (0)	I made a video . Not sure i can upload it in the thread.
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10-09-2023, 05:09 AM	#6
ChiltiCoatl89 Lieutenant 1769 Rep 435 Posts Drives: 2016 F10 BMW 535i M Sport Join Date: Jun 2023 Location: Nevada iTrader: (0) Garage List 2016 BMW 535i M Sport [8.34]	Be sure to read the terms carefully, and we do have a photo/video media thread.
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10-09-2023, 10:30 AM	#7
kokiignatov New Member 2 Rep 10 Posts Drives: F11 535 xd , E28 520i Join Date: Dec 2020 Location: Bulgaria iTrader: (0)	I uploaded on youtube and paste it here . Is that ok ? https://youtube.com/shorts/pJvmOpgCW...2--mQxBV-Talkv
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10-10-2023, 04:39 PM	#8
NikMN Private First Class 189 Rep 174 Posts Drives: BMW F10 n63tu Join Date: Oct 2022 Location: Minnesota iTrader: (0)	New belt can cause tensioned to bounce in the beginning because they are stored/shipped folded. I would check each pulley to make sure it spins true. Ether take the belt off or check with engine running (keep hands and objects away) it will smooth out if everything was installed correctly
	Appreciate 0 Quote