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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 > N54 belt question



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      10-16-2016, 08:33 PM   #1
domain007
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N54 belt question

Hey, so i just got my belt, idlers, tensioner and alternator pulley replaced and now my belt seems to walk 1/4 of an inch closer to and away from the engine. is that normal? i was told by my mechanic that this is normal but i have my doubts.
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      10-17-2016, 08:42 AM   #2
FCobra94
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pics?
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      10-17-2016, 08:44 AM   #3
E90ALLMANUAL
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It should be in the middle of the pulley.
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      10-17-2016, 09:01 AM   #4
Wolf 335
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original parts?
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      10-17-2016, 10:25 AM   #5
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Sounds like the belt may be misaligned on one of the pulleys.
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      10-18-2016, 02:30 AM   #6
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One of the part numbers online for the alternator pulley is incorrect. It has the wrong number of ridges.
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      10-19-2016, 07:56 PM   #7
domain007
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how many ridges is the alt pulley supposed to have? and ill upload a vid tomorrow as soon as i get some daylight.

Parts are not OEM they are aftermarket. I cheaped out on the belt, maybe it is a crap belt?
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      10-20-2016, 02:12 AM   #8
limitdown
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The correct one has 7 grooves. An incorrect one will rip your belt under big load. Ask me how I know....
This might or might not be the cause of your issues though.
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      10-25-2016, 08:14 PM   #9
domain007
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Update:
So turns out it was a crappy belt causing the walking. I put on an oem belt and it seemed to have fixed that issue. All my parts are correct as well thanks for the help, here's a virtual beer 🍺!
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      10-26-2016, 06:23 AM   #10
muncie21
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Quote:
Originally Posted by domain007 View Post
Update:
So turns out it was a crappy belt causing the walking. I put on an oem belt and it seemed to have fixed that issue. All my parts are correct as well thanks for the help, here's a virtual beer 🍺!
Can you post up the crappy and good belt manf and/or part numbers? If nothing else, just the good one
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      10-26-2016, 11:41 AM   #11
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OEM errday !
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