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      12-28-2013, 10:10 AM   #1
8k3
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Exclamation Torque spec for ARP rod bolts?

BMW spec (per ALLDATA) says to tighten to 2nm then 6nm, then to 130deg, loosen and repeat (2,6,130deg) 3 times
The sheet given by VAC says 45ft/lbs

Which is correct? Or rather what is the correct torque spec and procedure?

Thanks

Last edited by 8k3; 12-28-2013 at 10:19 AM.
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      12-28-2013, 10:26 AM   #2
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Quote:
Originally Posted by 8k3 View Post
BMW spec (per ALLDATA) says to tighten to 2nm then 6nm, then to 130deg, loosen and repeat (2,6,130deg) 3 times
The sheet given by VAC says 45ft/lbs

Which is correct? Or rather what is the correct torque spec and procedure?

Thanks
Both are correct. The different rod bolts have different torque specs. BMW rod bolts use torque angle (2nm + 130 degrees). ARP rod bolts use 45 ft/lbs.

Edit: Carrillo M9-CARR rod bolts use 50 ft/lbs.

Last edited by regular guy; 12-28-2013 at 10:42 AM.
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      12-28-2013, 04:33 PM   #3
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Quote:
Originally Posted by regular guy
Quote:
Originally Posted by 8k3 View Post
BMW spec (per ALLDATA) says to tighten to 2nm then 6nm, then to 130deg, loosen and repeat (2,6,130deg) 3 times
The sheet given by VAC says 45ft/lbs

Which is correct? Or rather what is the correct torque spec and procedure?

Thanks
Both are correct. The different rod bolts have different torque specs. BMW rod bolts use torque angle (2nm + 130 degrees). ARP rod bolts use 45 ft/lbs.

Edit: Carrillo M9-CARR rod bolts use 50 ft/lbs.
good to know!
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      12-28-2013, 05:43 PM   #4
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Here's the official BMW TIS procedure for rod bolt tightening. I'll be needing this for the Cleaerance wiki thread in the next day or two...so I looked it up.

Replace screws Screws washed and oiled
1. Jointing torque6 Nm
2. Setting torque20 Nm
3. Angle of rotation130-Degrees
Important 4. Release connecting rod bolts.
5. Jointing torque6 Nm
6. Setting torque20 Nm
7. Angle of rotation130-Degrees
Important 8. Release connecting rod bolts.
9. Jointing torque6 Nm
10. Setting torque20 Nm
11. Angle of rotation130-Degrees
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      12-28-2013, 06:02 PM   #5
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      12-28-2013, 06:40 PM   #6
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Weird. So BMW specifies that you have to tighten the same bolt 3 times in a row and loosen it in between each time?
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      12-29-2013, 04:21 PM   #7
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Quote:
Originally Posted by speedaddictM3 View Post
Weird. So BMW specifies that you have to tighten the same bolt 3 times in a row and loosen it in between each time?
Tightening three times is only necessary when the bolt is new. There is no benefit to doing it three times on a used bolt.
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      12-29-2013, 05:56 PM   #8
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Quote:
Originally Posted by ibmike
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