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Old 07-24-2014, 07:15 PM   #1
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Default Control Arm & Axle Torque

Does anyone have the torque spec for the axle bolt and the upper control arms?
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Old 07-24-2014, 07:22 PM   #2
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The axle bolt is a one time use stretch bolt with a specific installation procedure. See the Bently or Elsa manual.

Last edited by Mister Bally; 07-24-2014 at 07:24 PM.
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Old 07-24-2014, 09:34 PM   #3
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Control arm: 50 Nm + 90 turn

Drive axle: 200 Nm + 180 turn
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Old 07-25-2014, 10:58 AM   #4
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Default You have the right technical answers already. But, be prepared...

1. On control arms, lots of posts now w/ issues with that bolt. Read if you aren't familiar w/ it.

2. Mishar states the correct torque and process. But in the real world, that is probably 500 foot pounds or so at final torque with the 180 degree turn. As in, you either need a torque multiplier tool or a five foot or more lever arm. Probably the highest torque item on modern Audi's. Also be prepared for a good chance you will snap some part of a socket drive (breaker bar joint, extension, etc.) if you use half inch drive tools, and that you may not be able to break it even with a decent sized impact gun.
Current #1: '06 D3 A8L W12 brilliant black w/ amaretto; 4 seat setup, CPO; modestly lowered, H&R 20mm rear and 12mm front DRs with 275/35 on OEM polished + forged 20's; S8 sway bars (see: rear bar and gen'l D3 bar info and front bar); tweaked 385mm front factory brake mod and matching rear brake mod; matching C6 A6 back headrests (better rear view: headrest tweak); owner installed AMI retrofit with part number details here. [If you want pics in foregoing links, ask AW where they went...used all to work] Upper control arm reference (+ more info in replies) here. Lower cost D3 OES sway bar links here.
Current #2: 2013 Q5 2.0T hybrid; Scuba blue w/ chestnut sport interior; Euro delivery 7/2013 (pictured at Ingolstadt); RS5 front brakes
Prior (each modded): 2000 C5 A6 4.2 & '96 C4 A6 2.8Q, both still w/ family; '85 C3 5000S 5 sp FWD; '73 C1 100LS

helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

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Old 07-25-2014, 11:28 AM   #5
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A8 is a heavy car but 200 Nm (148 foot pounds) + 180 is definitely heavy truck domain. Tools including. You will probably need engine running in order to achieve enough braking power. Wheel shouldn't be under load with that bolt loose. It would damage the bearing.
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Old 07-25-2014, 11:28 AM
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