Focus Fanatics - View Single Post - 2012 Titanium Front Strut Low Speed Noise (Clunk/Rattle)
View Single Post
Old 11-03-2012, 09:33 AM   #1482
Focus Addict
Zillon's Avatar
Join Date: Jan 2005
Fan#: 17393
Location: Philthadelphia, PA
What I Drive: '13 GTI

Posts: 1,387
FF Reputation: 27 Zillon Great Standing Member
Buy-Sell-Trade Rating: (3)
No, the OEM bolts are 10.9 bolts.

What seems to be the case, is that the torque spec on the strut mount hardware is hyper-critical. A M8x1.25 grade 10.9 bolt has a torque rating of only 22-27 ft-lbs. That is why these are one-time use fasteners - they are designed to be torqued once and only once to 25 ft-lbs. If they are over-torqued, they stretch, which might induce clunking.

If anything, Ford should have gone with a bigger bolt. A M10 grade 10.9 bolt has a much higher torque rating at 45-53 ft-lbs.

Alas, I have no scientific proof just yet. I'll know more later today.
Joined the dark side.
Zillon is offline  
    Reply With Quote