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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Serpentine belt / pulley squeak when accelerating



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      05-01-2022, 07:36 PM   #1
N54tobes
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So half of the inside (closer to the motor) serpentine belt got ate up when I took it off and inspected pulleys the power steering one was missing half of the backside as well and changed it to a aluminum pulley got a new belt (also installed dp while I waited for parts) first day I put it on the ground it sounds fine for a while and then I started hearing a squeak whenever I accelerated even in neutral I took the belt off cleaned the groves of the pulleys and air pressured all around pulleys got a new tensioner and cleaned alternator (which is where sound is mostly coming from) and still nothing i tried turning the car on without serpentine belt on and it didn't make the noise really could use the help I hate when my car makes noise
Also from the beginning if I sprayed the inside of the tensioner pulley with wd40 the noise would go away

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      05-01-2022, 08:30 PM   #2
C4maro
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If you spray wd on the tensioner pulley and the noise goes away, doesn't that show where the problem is?
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      05-01-2022, 08:32 PM   #3
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Quote:
Originally Posted by C4maro View Post
If you spray wd on the tensioner pulley and the noise goes away, doesn't that show where the problem is?
But it's a brand new serpentine belt so I don't think it's that and where I was spraying (the tensioner pulley) is new as well
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      05-02-2022, 08:54 AM   #4
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What brand belt did you use? There’s some manufacturers that are too long and they squeak. Specifically a belt that advanced auto Has.
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      05-02-2022, 08:56 AM   #5
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Originally Posted by trb1 View Post
What brand belt did you use? There’s some manufacturers that are too long and they squeak. Specifically a belt that advanced auto Has.
I changed the belt to a continental and it seemed to go away but rn on my way to work I started hearing it again when pushing on the car more
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      05-02-2022, 10:21 AM   #6
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Belts can be inconsistent in length but 90% of time it's another aspect of the install causing the squeak. I'd double check the tensioner pulley because most likely that's the issue.
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      05-02-2022, 11:12 AM   #7
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Quote:
Originally Posted by Jaronbwall View Post
Belts can be inconsistent in length but 90% of time it's another aspect of the install causing the squeak. I'd double check the tensioner pulley because most likely that's the issue.
The noise went away right as I was down the street from my work place again so if it continues when I leave today I'll take a look at the tensioner pulley maybe I just installed wrong or something
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      05-02-2022, 08:50 PM   #8
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Well it wasnt making the noise after work so after I got home decided it needed a well deserved shower and…. The serpentine belt is now wrapped around my alternator



PAIN
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