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      11-23-2019, 08:50 AM   #1
Mike6699
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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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      11-23-2019, 11:04 AM   #2
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Iím pretty sure those are 13mm M10 bolts which are torqued to 42 Nm.
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      11-23-2019, 02:17 PM   #3
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Quote:
Originally Posted by Pig Farmer View Post
Iím pretty sure those are 13mm M10 bolts which are torqued to 42 Nm.
Thank you!
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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, 08:27 AM   #6
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Does anyone know the torque value of #3? Just wanting to replace the pulley itself and not the entire assembly.
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      09-17-2020, 10:31 AM   #7
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Quote:
Originally Posted by LKN624 View Post
Does anyone know the torque value of #3? Just wanting to replace the pulley itself and not the entire assembly.
Did you find a source for just the pulley? I didn't think it was available separately (from BMW) per the parts diagram.
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      09-17-2020, 02:40 PM   #8
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Quote:
Originally Posted by frankc View Post
Did you find a source for just the pulley? I didn't think it was available separately (from BMW) per the parts diagram.
Yes I did actually. Its made by INA which is the original supplier of the BMW branded one.

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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      09-21-2020, 12:15 AM   #9
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Bump anyone know? Thanks!
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      09-23-2020, 02:18 PM   #10
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Quote:
Originally Posted by LKN624 View Post
Does anyone know the torque value of #3? Just wanting to replace the pulley itself and not the entire assembly.
The bolt has a 10mm thread, so 42Nm (31ft lbs) seems like the way to go.
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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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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Quote:
Originally Posted by Davisca455 View Post
The bolt has a 10mm thread, so 42Nm (31ft lbs) seems like the way to go.
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.
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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Quote:
Originally Posted by LKN624 View Post
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?
The only thing touching the inner race of the bearing is the machined shoulder of the aluminum arm and the head of the bolt.
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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Quote:
Originally Posted by Davisca455 View Post
The only thing touching the inner race of the bearing is the machined shoulder of the aluminum arm and the head of the bolt.
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.
Yeah for sure...is there a certain direction the pulley should be facing? Or is it the same on both sides?
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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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Quote:
Originally Posted by LKN624 View Post
Quote:
Originally Posted by Davisca455 View Post
The only thing touching the inner race of the bearing is the machined shoulder of the aluminum arm and the head of the bolt.
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.
Yeah for sure...is there a certain direction the pulley should be facing? Or is it the same on both sides?
My original pulley is symmetrical.
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      09-24-2020, 01:28 AM   #16
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Quote:
Originally Posted by Davisca455 View Post
My original pulley is symmetrical.
Yeah that is what I thought...I might throw the old pulleys back and see if my new ones are defective.
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