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DIY-Replacing N52 tensioner, idler pulley and serpentine belt
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10-07-2012, 05:43 PM | #45 | |
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10-20-2012, 09:53 AM | #46 |
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cheap place i ordered online
i bought both the tensioner and idler pulley including shipping for only $93 after shopping online for a bit. www.oembimmerparts.com
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11-25-2012, 12:32 AM | #47 | |
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I'm gonna be replacing my belt sometime this week. Any pointers/tips for a 1st timer?
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01-18-2013, 11:57 AM | #49 |
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Just did it!
Thank you for your DIY. It took me only 20 minutes to replace the tensioner, the idler pulley and the serpentine belt. I took a 16 inches ratchet with a T60 to unload the tensioner in front of the car and it wasn't hard at all with that. I know, I'm very strong for my 160lbs... The idler pulley have a 16mm bolt and the tensioner's bolt took me a E14 torx box.
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01-26-2013, 11:18 PM | #50 | |
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02-28-2013, 11:58 AM | #51 |
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Straight from TIS, those numbers mean a specific section of the Torque Specification Document.
This is ONLY for N52 engine, the 335i N54/N55 might be different. Torque to 18 ft pounds for the tensioner, THEN torque it 90 degrees ignoring the torque. This is known as Torque to Yield or Torque to Angle, and I believe streches the bolt and allows for more consistency then if they just gave you a flat torque number. No where in TIS did I find the specs for the idler pulley, but the idler pulley on the alernator is 40nm or about 30ft lbs so I'm going with that. |
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04-09-2013, 08:52 PM | #52 |
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So I replaced the idler pulley, tensioner, and belt about a year ago (03/11/12) using this DIY as the belt was riding about a 1/4 inch off of the tensioner. After replacing everything I checked the belt a few times a week for the first month to ensure that everything was still seated properly and looked good. Fast forward to tonight and while looking under the hood to see if I could figure out where a squeaking was coming from, I noticed that the belt had once again begun to ride off the tensioner about a 1/4 inch.
Has anyone else seen this happen again after changing out the idler pulley, tensioner, and belt? It's a relatively simple job if I have to do it again, but I'm a little aggravated that this would happen again in such a short period of time and especially considering I have to buy all of the parts again!
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04-21-2013, 09:02 PM | #53 |
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all parts are available from autohausaz for $112
so whats everyone's mileage when they change the belt and pulleys???
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04-22-2013, 11:29 PM | #54 |
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I replaced my idler pulley, tensioner, and belt on my 07 at 64,227 miles.
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05-25-2013, 10:50 AM | #55 |
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2006 330i Sedan (07/2005)
106,xxx Miles -- no record of them being changed before.... I am gathering pricing info now to do this, thanks for the Autohausaz tip! |
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06-14-2013, 01:24 AM | #56 | |
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I have found the following on TIS and on the Bentley Repair Manual (sorry for the crappy iphone pics). It looks like the idler pulley on the alternator has to be installed with 80Nm or 59 ft-lbs. |
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06-14-2013, 10:43 AM | #57 |
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Oh, then i'll need to retorque mine
Makes sense cuz that bolt is pretty big
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06-18-2013, 08:27 AM | #58 |
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Hi all, I recently developed a whistling or howling notice at certain speeds, at first thought I was thinking the rear differential , then maybe a bearing , it is hard to determine where the sound is coming from, but now I think it's from the engine. As I started the car first thing this moring I was hearing the sound slightly, like metal on metal ( bad bearings ) sonds, but when driving it gets louder based on engine speed, could I be looking at same issue, I know I can test by removing the belt but wondering if you experienced the sound while driving as well.
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06-19-2013, 07:40 AM | #60 | |
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06-19-2013, 07:45 AM | #61 |
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Do these parts have to be OEM ?
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06-21-2013, 05:19 PM | #62 |
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I was planning on just replacing the belt because it started squealing this morning and when I checked it after work the belt was a 3/4" off the tensioning pulley at an angle, worn on the side it was rubbing. I took the belt off just now and think at least the tensioning pulley spins freely and barely makes that grainy sound. I saw videos saying that means the bearings are bad. Im still inclined to keep the pulley because it is spinning well, after all, and my relative very versed in this sort of repair, though not on BMWs, said not to replace stand alone pulleys (those not powering anything) if they spin well. He recommended only replacing them if they are becoming seized or cause extra friction to the belt, etc. Do you have any thoughts on this? Im going to just put the new belt on and wait for a solid reply/something to break. Thanks.
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06-22-2013, 08:48 AM | #63 | |
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06-22-2013, 03:45 PM | #64 | |
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06-22-2013, 04:34 PM | #65 | |
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06-22-2013, 10:18 PM | #66 | |
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