Time for new belt tensionner?

nassbmw · 08-03-2022, 08:13 PM

Hi,

Just looking for some advices regarding the serpentine/accessory belt.

I know it is a common topic on this forum but it seems like no one truly knows what "play" should be considered normal.

Here is a video I took from mine:
This is at operating temp. TURN DOWN THE VOLUME IF YOU DON'T WANNA BECOME DEAF LOL.
https://www.dropbox.com/s/xh3owtb0l9...4713F.MP4?dl=0

I saw this video on an old post and was shocked how steady the belt is.

What do you all think?

Oh and btw my car has 90 000km (50 000 miles) - 2016.

Hoa · 08-03-2022, 11:15 PM

It shouldn't move like that. Check the crank pulley to see if it is spinning normally. A failing one can vibrate and cause the tensioner to move like that. Crank pulley is below the tensioner.

nassbmw · 08-09-2022, 12:40 AM

Hoa thanks for the feedback,

Here is a video of the crankshaft pulley. https://www.dropbox.com/s/3j8gwvm1mw..._2356.MOV?dl=0

Seems normal to me.

What do you think?

tmarshall57 · 08-09-2022, 04:34 AM

Looks normal to me. On each of my BMWs i have however changed the belt, tensioner and idler pulleys once the car has reached 100,000 miles. On my e90 the pulleys were shot, on my E87 (replaced in June) the pulleys and belt were fine but the crankshaft pulley (which I hadn't thought of replacing) was falling apart, on my F10 (replaced last month) the belt and pulleys were fine.

Hoa · 08-09-2022, 03:45 PM

It's hard to say but I think it's ok. Try the tensioner first and see. Always do the belt, tensioner and idler pulleys together so you don't have to take everything apart every time you have to do something else. Save you a lot of time.

kikang86 · 08-11-2022, 10:39 AM

The belt is still in good condition. I recommend checking the belt for cracks.

08-03-2022, 08:13 PM	#1
nassbmw New Member 1 Rep 9 Posts Drives: bmw 535xi mpck 2016 Join Date: Jul 2022 Location: mtl iTrader: (0)	Time for new belt tensionner? Hi, Just looking for some advices regarding the serpentine/accessory belt. I know it is a common topic on this forum but it seems like no one truly knows what "play" should be considered normal. Here is a video I took from mine: This is at operating temp. TURN DOWN THE VOLUME IF YOU DON'T WANNA BECOME DEAF LOL. https://www.dropbox.com/s/xh3owtb0l9...4713F.MP4?dl=0 I saw this video on an old post and was shocked how steady the belt is. What do you all think? Oh and btw my car has 90 000km (50 000 miles) - 2016.
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08-03-2022, 11:15 PM	#2
Hoa Major 513 Rep 1,356 Posts Drives: BMW Join Date: May 2010 Location: GA iTrader: (9)	It shouldn't move like that. Check the crank pulley to see if it is spinning normally. A failing one can vibrate and cause the tensioner to move like that. Crank pulley is below the tensioner.
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08-09-2022, 12:40 AM	#3
nassbmw New Member 1 Rep 9 Posts Drives: bmw 535xi mpck 2016 Join Date: Jul 2022 Location: mtl iTrader: (0)	Hoa thanks for the feedback, Here is a video of the crankshaft pulley. https://www.dropbox.com/s/3j8gwvm1mw..._2356.MOV?dl=0 Seems normal to me. What do you think?
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08-09-2022, 04:34 AM	#4
tmarshall57 Captain 56 Rep 623 Posts Drives: F10 530d M Sport, E87 118d M Join Date: Apr 2008 Location: Bury, Lancs, UK iTrader: (0) Garage List 2009 BMW E87 118d M ... [0.00] 2012 BMW F10 530D M ... [0.00] 1997 K1100RS Specia ... [0.00]	Looks normal to me. On each of my BMWs i have however changed the belt, tensioner and idler pulleys once the car has reached 100,000 miles. On my e90 the pulleys were shot, on my E87 (replaced in June) the pulleys and belt were fine but the crankshaft pulley (which I hadn't thought of replacing) was falling apart, on my F10 (replaced last month) the belt and pulleys were fine. __________________ F10 530d M Sport, September 2012 Individual Amazonite Silver, Oyster Dakota Leather, Auto, Nav Pro, Bluetooth + USB Devices, Expanded BMW Online, Comfort Seats, Sunroof, Sun Protection Glass Individual Satin Walnut Honey Brown Trim Interior Inside/Outside Mirror with folding and autodip, M Rear Spoiler
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08-09-2022, 03:45 PM	#5
Hoa Major 513 Rep 1,356 Posts Drives: BMW Join Date: May 2010 Location: GA iTrader: (9)	It's hard to say but I think it's ok. Try the tensioner first and see. Always do the belt, tensioner and idler pulleys together so you don't have to take everything apart every time you have to do something else. Save you a lot of time.
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08-11-2022, 10:39 AM	#6
kikang86 Registered 2 Rep 4 Posts Drives: BMW F10 Join Date: Aug 2022 Location: Korea iTrader: (0)	The belt is still in good condition. I recommend checking the belt for cracks.
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