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11-23-2019, 08:50 AM | #1 |
tonkpils
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Belt Tensioner Torque Specs
Hi guys,
I searched and couldn't find any info, but can anyone tell me what the torque specs are for the belt tensioners? Specifically bolts 1 and 2 in the pic. Thanks!
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06-18-2020, 10:51 AM | #4 |
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I noticed bolt 2 in your picture came completely loose when i changed my belt last week. It made the whole assembly moving, however when re-tightening to proper torque, I can't move my tensionner anymore pushing with a ratchet on bolt 3. Is that normal ?
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09-11-2020, 11:59 PM | #5 |
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Just to avoid the over-torquing of tensioner bolts 1 and 2 and possibly damaging the block, they are silver zinc (ZNS) M8 8.8, not M10. The torque spec for M8 8.8 ZNS is 19NM per TIS:
[edit] I was installing this tensioner today and noticed that bolt #1 was M8 10.9, not 8.8. Bolt #2 is M8 8.8. I used the 8.8 spec for for both (19Nm) https://www.newtis.info/tisv2/a/en/e...ations/5gDQK89 The bolt for the power steering & A/C deflection pulley is an M10 and requires special torque as specified in TIS: https://www.newtis.info/tisv2/a/en/e...lement/5yhnA2X Last edited by frankc; 09-27-2020 at 05:02 PM.. |
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09-17-2020, 10:31 AM | #7 |
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09-17-2020, 02:40 PM | #8 | |
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Part number is: INA 532 0342 10 Its about 10 euros for one and you'll need two of them. Comes with a new dust cover and the bolt/washer. |
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09-23-2020, 02:18 PM | #10 | |
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Additionally, it appears the factory used red Loctite on the threads as well, at least that's what appeared to be on my bolt once I got it removed. Had to use a wrench all the way out.
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Chris, 2008 E92 Last edited by Davisca455; 09-23-2020 at 04:02 PM.. |
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09-23-2020, 06:30 PM | #11 |
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Thanks for the research but it seems as though...that 40Nm (I just guessed), might be too tight. I am getting a HORRIBLE vibration from the engine which I can feel through the entire car at idle and also when you rev the engine up. Perhaps it might be less?
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09-23-2020, 07:57 PM | #12 | |
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And the inner race of the bearing looks to be a pretty substantial hardened steel single piece unit? I hope that isn't so much torque that it could cause the pulley to start seizing its bearing. |
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09-24-2020, 12:20 AM | #13 | |
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09-24-2020, 12:42 AM | #14 |
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Actually looking at NEWtis Torque chart. Its an M10 bolt 10.9 silver coated which it says 56 Nm...so perhaps i'll need to tighten it more.
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09-24-2020, 01:08 AM | #15 | ||
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Chris, 2008 E92 |
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09-24-2020, 01:28 AM | #16 |
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10-29-2020, 06:16 AM | #17 |
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I had this bolt break on my tensioner, do you know if the thread is 10-32, 10-24 or 10x1.5?
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2013 Fire Orange II E92 M3 ZCP
Bimmerworld (Quad) Resonated X-Pipe, AFe Stage 2 CF Intake, Carbon Project CF Plenum, Epic Motorsports Race Tune, Rogue Engineering Power Pulleys, Continental Extreme Contact Sport |
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10-29-2020, 10:08 AM | #18 | |
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I do have my hands and eyes on coarse thread M10s on a near daily basis and it did look like a coarse thread bolt to me, which is what I would expect for threading into aluminum. I do know that the threads on the long bolt used for the fixed idler is M10x1.5 (because I replaced it with a stud), and that one screws into aluminum as well. Plus, I doubt the BMW engineers would use different M10 thread pitch fasteners into aluminum. The bolt head has a unique shape though, so let us know where you source a new one.
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10-29-2020, 10:35 AM | #19 | ||
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2013 Fire Orange II E92 M3 ZCP
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10-29-2020, 04:49 PM | #20 |
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@MikeYQM
I bought this 70mm OD pulley from FCP https://www.fcpeuro.com/products/bmw...li-11281440237 and the pulley itself was correct. It came with a bolt, but the bolt takes a Torx head, which might not be ideal for getting a wrench onto it when servicing the belt? Junkyard might be the way to go for the bolt? Side note: My A/C & PS pulley was slightly smaller (65mm OD) than the Alternator/Water Pump pulley (70mm OD). The 70mm OD did work for both locations though. I did finally find the proper part number for the smaller pulley, but it doesn't come with a bolt. https://www.fcpeuro.com/products/clo...or-95510211921 Dust Cap: https://www.fcpeuro.com/products/bmw...ap-11287535867
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02-28-2023, 05:52 PM | #22 | |||
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Drives: '11 BMW M3
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Bolt 1: M8 10.9 - 42Nm Bolt 2: M8 8.8 - 19Nm Just wanting to confirm in case anything has changed or different info has become available in the past few years as google seems to give me the torque values below: M8 10.9 - 34 Nm M8 8.8 - 24 Nm Quote:
And this thread is giving me a value of 40Nm
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New: '11.5 e90 M3 | DCT | Space Gray/Novillo | ZCV | ZCW | ZP2 | ESS 625 | BPM | M Performance | iPE | BC Racing | BPM | iND | LUX | Volk | Coby | Recaro
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