2012 Titanium Front Strut Low Speed Noise (Clunk/Rattle) - Page 143 - Focus Fanatics
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Old 10-31-2012, 07:56 AM   #1421
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Quote:
Originally Posted by Dann0 View Post
Hi I have recently bought a used 2011 Mk3 Focus (1.6 125 zetec).

I have noticed that when riding over speed bumps/ramps (i always take them pretty slow :)) that there is a kind of crunch/scraping noise but i cannot identify what it may be. Although it does seem to be comming from the front of the car.

The car is in good condition and has done just over 4000 miles (bought used from Ford Dealership).

I have had a look under the car and cannot see what would be causing it, there is a cover underneath the engine bay but this does not seem to be loose as far as i can tell.

In all other respects the car drives and handles fine, the tyres are at the correct pressure also. My concern is there may be some sort of underlying issue with the suspension.

Has anyone else experienced this? If so did you manage to track down the casue?

Thanks for taking the time to read through...
There is a 100+ page post about potential issues with the suspension clunking/ rattling over low speed bumps. It appears that for some replacing the strut, the bearing and the spring on that side has fixed the issue, however for others it may reappear on the other side, or may return on the same side indicating a possible issue with the strut tower itself assuming it is in the suspension at all and not a rattling coolant bottle mounted on the right front strut tower.
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Old 10-31-2012, 08:12 AM   #1422
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Originally Posted by TboneZX3 View Post
UPDATE:

After a few cold morning drives (below 35F), I can say that I have no strut noise. YMMV--mine had just started making some noise so my mount and bolts might be in better shape than those who have a more dramatic noise for a longer period of time.

Thankfully, I also got rid of my door rattles over the weekend so, except for a heat shield rattle that I will soon fix, my car is nearly quiet again.
Good to hear.

So that's 3 people now (myself, dyn085, and TboneZX3) who have had their clunk either minimized or eliminated from bumping the torque spec on the bolts.

Ford, are you listening?
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Old 10-31-2012, 10:15 AM   #1423
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Originally Posted by hand-filer View Post
Yes I am aware of the factory specification, but at what torque load does the stud begin to stretch? We don't know what the tensile strength of this material is. That is my concern.
It's more than likely a class 10.9 material which has a maximum torque value of around 27 ft-lbs.
Not trying to be a smart ass; just don't want to see anyone get into a situation.
Just to give you an update, the bolts do, in fact, have 10.9 stamped into the heads.
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Old 10-31-2012, 10:24 AM   #1424
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Originally Posted by Zillon View Post
Just to give you an update, the bolts do, in fact, have 10.9 stamped into the heads.
Do you know the size/thread of the bolt? (even the size socket used on the bolt) I want to check the maximum torque these bolts should be seeing as well as see if they're available in a grade 12.9.

Though, I also technically need to know the length of thread engagement and the properties of the material that it's being screwed into (the strut mount bolts screw into a nut, right? or into something else?)

Double-edit: Are these bolts built into the mount? As in you can't change them?
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Old 10-31-2012, 10:44 AM   #1425
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Originally Posted by PratoN View Post

Double-edit: Are these bolts built into the mount? As in you can't change them?
That's what I was going to ask also. If we can replace them, then we should replace them with 12.9s (33 ft lbs torque rating), as that would be much safer than having the 10.9s under 35 ft lbs, and maybe even install some cone springs to help offset changes due to temperature fluctuations.
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Old 10-31-2012, 10:45 AM   #1426
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Quote:
Originally Posted by Zillon View Post
Good to hear.

So that's 3 people now (myself, dyn085, and TboneZX3) who have had their clunk either minimized or eliminated from bumping the torque spec on the bolts.

Ford, are you listening?
Yep, I'm listening. I want to start collecting VINs of folks who experienced success with this fix. Please send me a PM with your VIN, when you performed the fix, and whether the clunk is minimized or eliminated.

Once I have a nice sample size collected, I'm sending this data straight to our engineers.

Thanks everyone!
Crystal
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Old 10-31-2012, 10:47 AM   #1427
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Originally Posted by FordCustomerService View Post
Yep, I'm listening. I want to start collecting VINs of folks who experienced success with this fix. Please send me a PM with your VIN, when you performed the fix, and whether the clunk is minimized or eliminated.

Once I have a nice sample size collected, I'm sending this data straight to our engineers.

Thanks everyone!
Crystal
Why not send each one you get instead of waiting? so we can get them testing it ASAP. So we can FINALLY get something FIXED
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Old 10-31-2012, 10:51 AM   #1428
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PM sent, Crystal. Thanks.
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Old 10-31-2012, 10:53 AM   #1429
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It looks like they're removable. I think part number 3C448 is a bolt/washer combo, no?


ebay (Note: might not be the exact part...?):
http://www.ebay.com/itm/FORD-OEM-MOU...&forceRpt=true
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Old 10-31-2012, 11:01 AM   #1430
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Quote:
Originally Posted by PratoN View Post
It looks like they're removable. I think part number 3C448 is a bolt/washer combo, no?


ebay:
http://www.ebay.com/itm/FORD-OEM-MOU...&forceRpt=true
Yup.... CV6Z-3C448-A

Chris posted a helpful link to a PDF with all of the parts listed:

http://www.fordracingparts.com/downl...htM-FR3-FS.pdf


Edit: Dumb question... When the strut is mounted into the strut tower, isn't it a metal-on-metal connection? If so, then there is nothing there to compress. At 25 ft lbs, it should be compressed as far as it can go right? Not doubting that this fix works, just curious about the mechanics behind it.
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