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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > serpentine belt re-fitting issue.



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      12-30-2019, 03:37 AM   #1
nomiS330d
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serpentine belt re-fitting issue.

About 6 months ago a squeak from the aux belt started so i replaced the belt as it was cracked and looked old. The squeak went away. I had a real issue with the tensioner though. Everytime i tried backing it off by using a ratchet on the mounting bolt it kept coming undone just before i could get the belt on. I tightened it up to what i thought was FT before trying again but it kept letting go. Eventually after about 30 mins of anguish and much swearing i managed to succeed.
The bloody squeak is back but louder this time so i'm wondering if i've got a bearing issue. To investigate i'm going to take the belt off and run the bearings to see if any are noisy or have end float. Was i doing something wrong re. the tensioner? If not has anybody else had this issue and found a way round it? Thanks.
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      12-31-2019, 04:04 AM   #2
matt_s
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I had similar returning squeak on my e90 330d... the new belt wasnít up to it.
https://www.e90post.com/forums/showthread.php?t=1650484

Are you struggling to keep the tensioner back or push it back? If youíre struggling to keep it back, is there a place to put a retaining pin (drill bit?) push back, pin, fit belt, take up tension, remove pin.

M
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      12-31-2019, 11:18 AM   #3
nomiS330d
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I realised yesterday there is a torx hole under the pulley, t60 I think it is thatís for holding the tensioner back while slipping the belt off and on. Last time I was trying to do it using the bolt that holds the actual pulley to the tensioner dur brain me!
Anyway, I ran all the pulleys and they all seem ok so I put the belt back on. The squeak is still there.
I have read dayco belts are prone to this, the last belt was dayco as is this one thatís been on about a year. Iím going to order a continental one which apparently stay quiet. Worth a go for £20 anyway.
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      01-01-2020, 09:23 AM   #4
matt_s
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Continental fixed it for me, glad you realised where the torx hole was :-)
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      01-18-2020, 06:14 AM   #5
Jimc89
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My 07 325d has just turned 100000 miles i have owned the car for 8 years now and still have no real reason to change it,

anyway i have been doing some maintenance and next on my to do list is belts and pulleys i have priced up OEM but before i pull th trigger just wondering what you guys recommend

cheers
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      01-18-2020, 12:53 PM   #6
Tambohamilton
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Decent brand tensioner, and continental belt as mentioned here. The tensioners are simple parts, and generally don't give any hassle so long as the bearing is decent. I generally go for tensioners from bearing manufacturers.
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