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-   -   Bang/Knock/Clunk sound when releasing clutch (http://www.focusfanatics.com/forum/showthread.php?t=298331)

flaurencelle 09-24-2012 09:56 AM

Bang/Knock/Clunk sound when releasing clutch
 
Hello All!

I've been experiencing a very annoying sound recently. Everytime I let the clutch go i hear this BANG or KNOCK or whatever in the cabin and I can feel it at the pedal area.

Apparently the Dogbone was changed before I bought the car, but I'm not sure it's good. It moves quite a lot but it might be normal. This "knock" could be something else..I really don't know!

Here is a link of the video I've taken... Any Idea if this is normal mount behavior? Or anybody has a clue what the "knock" could be caused by?

http://youtu.be/UCuAhmzfhQ0

Thank you very much!

nascaracing17 09-24-2012 10:08 AM

mine is making the same niose.. its only if i pop the clutch ittl bang. im going to replace the dogbone bushings and i also found that my fswerks strut bar was hitting my stock air filter box when the engine rocked that much. and that was 90% of the noise. all i did was stuff a rag inbetween the strutbar and airbox and BAM. noise 90% gone lol give it a shot

BigRed03 09-24-2012 10:26 AM

the stock dog bone allows for quite a bit of movement. check your pass side mount. there may be a cap to pop off covering what i like to refer to the indicator. Once the cap is off, youll see rubber in the middle. Inside the mount there is hydraulic fluid. Should this mount fail, the rubber will concave IN; it should be convex OUT (indicating full of fluid). OE replacements (recommended from Steve, not the autoparts store options) or poly aftermarkets will run $180+ if you want it to last more than 2 months.

Plus, that dog bone is easy to take out and can be fixed with poly inserts for $25 plus some time.

flaurencelle 09-24-2012 11:15 AM

Ya, I did replace both upper engine mounts from Steve @ Tousley, made a difference for bad vibrations, more specifically, the passenger side one. The driver one, rarely goes bad...

I also checked if something else was knocking around by removing the engine mount bolt and rocking the engine forward and back by hand and the engine rocks free..nothing in the way..!

Also, I've tried putting a jack under the tranny while the torque mount was unbolted and the "Bang" is gone...I just hear it through the jack! So very likely the mount is shot...

I don't know if I should buy another rubber one or go with the Poly one..

I don't like vibrations too much, I had poly upper mounts and my teeth were falling..!

Anyone else has a clue?

Thanks a lot!

Jonny pep 11-13-2012 07:55 PM

My car does the a light clunk when up shifting only. Mounts seem ok besides the pass mount. It's not leaking but has a slight crack around the bottom. I swapped it with a vf mount and still does the clunk. Any advise?

StephenElsbree1986 11-13-2012 10:22 PM

This is the clutch fork no? We have these, its wearing the hydrolics are making the fork release to quickly causing it to drop.... Is this not the case?

iminhell 11-13-2012 10:52 PM

Quote:

Originally Posted by Jonny pep (Post 4454427)
My car does the a light clunk when up shifting only. Mounts seem ok besides the pass mount. It's not leaking but has a slight crack around the bottom. I swapped it with a vf mount and still does the clunk. Any advise?


First, try adjusting the shift cables. There is a thread in the "How-To" section about the procedure.

Jonny pep 11-14-2012 07:57 AM

Shift cables are adjusted. Still a slight knock when letting off the clutch after shifting. If I stay in gear and bounce my foot off the clutch pedal or down shift... It doesn't do it.

iminhell 11-14-2012 09:40 AM

So the noise is only there while upshifting, 2 -> 3, 3 -> 4, etc?

I'm not sure, mostly because I can't recall what gear is on what shaft, but,
The SVT trans is a twin layshaft design. I'm wondering if the bearings on just 1 shaft are worn. That's about the only thing I can come up with. Not something I'd want to fix being you can find used trans's rather easily.

StephenElsbree1986 11-14-2012 09:59 AM

Sorry we don't have Clutch forks we have "shifting forks" anyways watched the video, isn't that just the mounts.....


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