2012 Titanium Front Strut Low Speed Noise (Clunk/Rattle) - Page 149 - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus Third Generation > MK3 TSB, Recall & Problems Archive

MK3 TSB, Recall & Problems Archive The place to chat about TSB and Known Issues for the 2012 Focus.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 11-03-2012, 09:24 AM   #1481
TiStick
Boob Whisperer
 
TiStick's Avatar
 
Join Date: Mar 2012
Fan#: 96514
Location: Los Banos, CA
What I Drive: LesVagon

Posts: 6,092
FF Reputation: 16 TiStick Great Standing Member
Buy-Sell-Trade Rating: (5)
Good work Zillon!!
__________________
Sonic's Mk3 Crew #11
Hatch Nation#163
Quote:
Originally Posted by suss6052 View Post
Watch out for the D
TiStick is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 11-03-2012, 09:33 AM   #1482
Zillon
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
Old 11-03-2012, 10:10 AM   #1483
jrn146
Focus Enthusiast
 
Join Date: Sep 2003
Fan#: 275
Location: PA, United States
What I Drive: 2012 Candy Red SE 5 door 5 speed

Posts: 233
FF Reputation: 1 jrn146 Good Standing Member
Buy-Sell-Trade Rating: (0)
Zillon, thanks for all you're doing. I was about to re-torque mine this morning and figured I should check for new developments. Good thing I did. I'm willing to try a fix since it doesn't seem like Ford is doing anything about this. If it's a case of bad/wrong bolts or torque specs then it seems like they aren't looking to hard for a solution or they would have found this by now.

By the way, mine isn't listed as having the handling package.
jrn146 is offline  
    Reply With Quote
Old 11-03-2012, 10:27 AM   #1484
Shade-010
Sonic Crew # 010
 
Shade-010's Avatar
 
Join Date: Jul 2011
Fan#: 87369
Location: Noblesville, IN
What I Drive: 2012 Ford Focus SE Sport - 5 Speed

Posts: 9,743
FF Reputation: 10 Shade-010 Great Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by Zillon View Post
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.
cool beans, man let us know , I don't know why thye would go with such a small bolt for a critical area
__________________
2012 Ford Focus SE Sport-5 speed-203A package
Basline 1 -155.48hp 145.80 tq 93 oct. Lunchbox delete & K-N Drop in filter.
Dyno 2 -161.86 hp 151.6 tq - 93 oct. RDC 2.5" Catback & K-N Drop in filter.
http://www.rebeldevil.com
Shade-010 is online now  
    Reply With Quote
Old 11-03-2012, 11:15 AM   #1485
hand-filer
Focus Enthusiast
 
hand-filer's Avatar
 
Join Date: Oct 2011
Fan#: 90895
Location: Wpg, Canada
What I Drive: One less Ford

Posts: 343
FF Reputation: 1 hand-filer Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by stang74shelby View Post
So what your saying is Ford is puttin Sub-Par Bolt in our cars and giving us these issues... I HOPE YOU ARE LISTENING FORD.... we need to get them to upgrade all of our cars to the Grade 10.9 ASAP.
Why are you saying Ford is using sub par bolts? When you exceed the factory torque specs. you are playing with fire, plain and simple.
Nothing wrong with backyard engineering as long as you follow some simple rules.
In the end if there is a fix for this problem it will be something entirely unrelated to the strut mounting bolts.
FYI the Mustang struts are held in place with 8mm studs and nuts, are torqued to 25 foot pounds and do not have issues.
__________________
2012 Mustang Brembo GT - Kona Blue
2013 Acura RDX - Alabaster Silver
hand-filer is offline  
    Reply With Quote
Old 11-03-2012, 11:58 AM   #1486
Shade-010
Sonic Crew # 010
 
Shade-010's Avatar
 
Join Date: Jul 2011
Fan#: 87369
Location: Noblesville, IN
What I Drive: 2012 Ford Focus SE Sport - 5 Speed

Posts: 9,743
FF Reputation: 10 Shade-010 Great Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by hand-filer View Post
Why are you saying Ford is using sub par bolts? When you exceed the factory torque specs. you are playing with fire, plain and simple.
Nothing wrong with backyard engineering as long as you follow some simple rules.
In the end if there is a fix for this problem it will be something entirely unrelated to the strut mounting bolts.
FYI the Mustang struts are held in place with 8mm studs and nuts, are torqued to 25 foot pounds and do not have issues.
not subpar in that sense, but in the sense that if we should use stronger bolts and torqued to a better value for the design. I have seen larger vehicles with smaller bolts and smaller ones with larger, it depends on the strain/torsion in location we are talking about. also are the upper strut (bearing) mounts hard rubber or plastic... or are they Metal on the Mustang?
__________________
2012 Ford Focus SE Sport-5 speed-203A package
Basline 1 -155.48hp 145.80 tq 93 oct. Lunchbox delete & K-N Drop in filter.
Dyno 2 -161.86 hp 151.6 tq - 93 oct. RDC 2.5" Catback & K-N Drop in filter.
http://www.rebeldevil.com
Shade-010 is online now  
    Reply With Quote
Old 11-03-2012, 12:00 PM   #1487
dyn085
That Guy
 
dyn085's Avatar
 
Join Date: Apr 2012
Fan#: 98047
Location: Fayetteville, NC
What I Drive: 2014 FiST/FoST

Posts: 12,025
FF Reputation: 47 dyn085 Great Standing Member
Buy-Sell-Trade Rating: (5)
Quote:
Originally Posted by hand-filer View Post
Why are you saying Ford is using sub par bolts? When you exceed the factory torque specs. you are playing with fire, plain and simple.
Nothing wrong with backyard engineering as long as you follow some simple rules.
In the end if there is a fix for this problem it will be something entirely unrelated to the strut mounting bolts.
FYI the Mustang struts are held in place with 8mm studs and nuts, are torqued to 25 foot pounds and do not have issues.
I think that what should be taken out of Mikes statement is the frustration that he, I, and many others are feeling with this situation. My car has had the clunk from day one, to some degree or another, and now has over 10k miles. It's difficult for people like myself to try and maintain a positive attitude when Ford only appears to be gathering data while frustrated owners throw everything at the car in an attempt to locate the issue and find a fix.

That being said, I wouldn't discount the strut mounting bolts or any other part of the front suspension. Something in there is wrong, whether it be wrong parts, incorrect torques, misalignment...we don't really know for sure. What I do know is that Zack is one of the only people investing his time and money into trying to come up with a solution, and he's doing it in a manner that is honest and up-front. Granted, whatever works for his car may not work for all, but it will work for some and hopefully resolve some of our members' anger and frustration.

Then, just like the '13 model offerings, Ford will take our free labor and testing and incorporate it (hopefully) into a fix.
__________________

FocusFest 2013: Best of Show
Gateway FFW: Show Class Outstanding
September '13 ROTM
2014 FiST-
dyn085 is online now  
    Reply With Quote
Old 11-03-2012, 01:19 PM   #1488
Zillon
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)
Well, I had originally intended to go with grade 10.9 M8x1.25x30 flange bolts, but Lowes' website lies. Instead, I picked up grade 12.9 hex cap head bolts, which have a max torque rating of 33 ft-lbs; this is more in line with my plans, and they should resist shearing better than the OEM bolts.

Additionally I'll be cutting the heads of the OEM bolts off to salvage the spacers, and drilling them out 1mm to fit over the 8mm bolt threads.

I'll keep you guys updated.
__________________
Joined the dark side.
Zillon is offline  
    Reply With Quote
Old 11-04-2012, 04:59 PM   #1489
PratoN
Focus Fanatic
 
PratoN's Avatar
 
Join Date: Jul 2011
Fan#: 88058
Location: Milwaukee, WI
What I Drive: 2012 Kona Blue Ti Hatchback, DCT

Posts: 3,753
FF Reputation: 10 PratoN Great Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by Zillon View Post
Well, I had originally intended to go with grade 10.9 M8x1.25x30 flange bolts, but Lowes' website lies. Instead, I picked up grade 12.9 hex cap head bolts, which have a max torque rating of 33 ft-lbs; this is more in line with my plans, and they should resist shearing better than the OEM bolts.

Additionally I'll be cutting the heads of the OEM bolts off to salvage the spacers, and drilling them out 1mm to fit over the 8mm bolt threads.

I'll keep you guys updated.
Thanks for being awesome! I'm just happy you found the 12.9 grade bolts. I guess I'll hold off on buying any mounts to play around with.
__________________
2012 FF Ti HB Kona Blue, Built 5/24/2011, 401A + Ti Handling Package, Parking Technology Package, Winter Package, Moonroof, and MFT w/NAV at v3.6 91k miles and counting...
PratoN is online now  
    Reply With Quote
Old 11-04-2012, 05:40 PM   #1490
Zillon
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)
Well, preliminary verdict is that this works, and it's safe.

I cut the heads off of the factory bolts to salvage the spacers and drill them out to fit the 12.9 grade bolts.

I ended up using a 5/16" carbide bit, with a second person dripping cutting oil around the bit, to drill them out. The spacers are hardened, so beware. They will take some work to ream out to the right size.



That's the final setup. I torqued them to 35 ft-lbs, and used a bit of anti-seize between the spacer and the bolt, to inhibit corrosion. I did not use anti-seize on the threads.

The only issue I seem to have is a little bit of groaning from the left front, but I think it's because I need to re-align the struts in the towers, which I'll do at work tomorrow.
__________________
Joined the dark side.
Zillon is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 11:36 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.