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Should I replace these? is this a bad sign of corrosion or just normal? 

 

20151114_213012_zpseg9rijzt.jpg

 

 

The wheel bolts are extended bolts made by DesignTek as I have wheel spacers on. This is the technical data on the wheel bolts - 

 

 

DesignTek wheel bolts are produced from SCM440 grade alloy steel which has good resistance to a wide variety of corrosive media including nitric acid and some organic acids. It attains its maximum corrosion resistance when in the highly polished or buffed condition. In general its resistance to pitting and crevice corrosion resistance is close to that of grade 304. Stress corrosion cracking resistance of Grade 440 is very high. Each wheel bolt is chrome-plated and salt spray tested 240 hours.

 

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I would just clean them up and apply anti-seize paste as Porsche recommends.

 

Thanks Loren, would any type of copper grease do? 

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I use Permatex Anti-Seize Lubricant which is a blend of aluminum, copper and graphite lubricants.

A thin coating will affect torque settings slightly - but that is better (IMHO) than corroded and rusted on wheel lugs.

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A thin coating will affect torque settings slightly.

 

Does that mean I should tighten more or less? 

 

If Porsche recommend anti seize & haven't changed the torque specs then I asusme 96 ft/lbs is still ok? 

Edited by no1joey

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To continue, have I read correctly that the torque should be 113 ft-lbs?

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To continue, have I read correctly that the torque should be 113 ft-lbs?

 

For which vehicle (always helps to include this)?

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For all 997 as of MY 2005 tightening torque is 96 ftlb or 130 Nm

Always apply a thin coat of Optimoly TA (aluminium paste) on the thread of the wheel bolts, on the shank and between the bolt head bearing surface and spherical cap ring (under the head)

Do NOT grease the spherical cap bearing surface facing the wheel.

As per instrucyion manual - Never use an impact bolter.

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Just as a matter of interest, the wheel bolt torque setting was changed for MY2012, and can also be applied retroactively.  The 997 manual now says:

 

Always observe the specified tightening torque. The tightening torque for securing wheels is contained in the document 4001TW.  4001TW Tightening torques for front axle

 

Screw in wheel bolts by hand and then tighten evenly. Start at the top when tightening.

  • Silver wheel bolts (up to model year 2011) = 130 Nm (96 ftlb.). 160 Nm (118 ftlb.) also permitted retroactively.
  • Silver wheel bolts as of model year 2012 = 160 Nm (118 ftlb.).
  • Black wheel bolts = 160 Nm (118 ftlb.)
Edited by Richard Hamilton
  • Upvote 1

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