LOUD CLUNK noise from rear when pulling off, any ideas?

Gibbo

Gibbo

Gibbo

OcUK Staff
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Hi there


After yesterdays track day it seems something in the rear has come lose or even worse the differential is upset.

Here is a video (happens at 17s):



Only happens when pulling off and only sometimes, the noise of the clunk is always different volume, sometimes quiet, sometimes loud, of course letting the clutch out faster tends to make it louder.

However it does not feel like driveline thud/bang if makes sense, it actually feels more like something right in the back of the car at the rear, but diagnosing a noise is hard.

Any ideas?

Gonna drive home gently and get the rear in the air and double check everything.
 
Diagro said:
Take it back and have them rwpair it. Hopefully you haven't told them.it's been on track?
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Track use is fine, does not void warranty especially as it was a Ford paid for track event as well. ;)

Car drove home fine, hit pot holes, bumps, brakes hard no bangs or clunks. However do an aggressive downshift and rev match get it slight clunk/thud, but have to pull of quite harsh to make it do it.

Yes these cars do have some driveline thud standard is common on them and mine did this from new as they all do it but hardly noticeable. This is very noticeable but only when pulling off, but before track day no such clunk when pulling off, so something must be lose is my thought.

Wheel spinning under power, sideways, chuck car around no noise, just pulling off.

So as it drives essentially fine will just take it garage tomorrow and check all is tight and if nothing shows up then yeah Ford can fix it.
 
Will said:
Subframe lose is my guess, like Clarkey says, my old Civic Type R (FN2) did similar, it was a common problem for those on the front, the bolts would need tightening, it manifested itself in exactly the same way, a single mechanical 'clink' sound when getting on the throttle.

Have you actually done anything to the rear subframe at all, locking collars or replacement bushes/inserts or anything? My thinking is something is now loose there if its been tinkered with, the higher loadings on track can make things move if they're not perfectly tightened.
Click to expand...

Yes all subframe bolts were removed to do CB005 over a month ago, so you and Clarkey could be right, gonna go through everything I've undone tomorrow and then re-torque with blue loctite.

I am thinking lose subframe bolt or lose differential bolt (bolts that secure rear diff into subframe.
 
Clarkey said:
I guess Ford are likely to wash their hands of it considering the problem is almost definitely caused by the modification work done to it.
Click to expand...

Not only that but they aint gonna have much more of a clue, easier to just tighten everything down myself and if it still does it and I am confident its the differential itself well then they can fix it.

But I am feeling it is as suggested a lose bolt allowing either subframe or differential movement.
 
Bone9 said:
I'd check the driveshaft nut/bolt that holds it in the hub. Focus st's are known to click like that and ford glue the shaft in place to stop the noise. Replace the nut or bolt and torque up to see if that cures it.
Click to expand...

Yep Fuzz suggested I check this, when I take it mates garage tomorrow we can check all these suggestions and if we find the issue will share what fixed it. :)
 
Freefaller said:
The 350Z suffers from this, prop shafts - sounds as though it could be the same, especially if you've been tinkering :p
Click to expand...

The Mustang as standard has driveline noise and thuds, just part of the design.

This is something other than the norm gonna check:
- Subframe bolts (Feeling this is main culprit)
- Caliper bolts
- Hub bolts
- Differential bolts
- Rear ARB
- Rear pads


In normal driving it hardly ever does it, on the rare occaison it might do it when on power over some rough bumpy roads, just a solid clunk which is making me feel subframe bolt or when pulling off sometimes or easy it moving forward and backward and letting clutch out quick.

So I feel its a bolt lose or not torqued properly as whatever it is does not seem to be getting loser if makes sense. Main thing is car drives fine so its not resulted in having to park it can still use it daily but taking it garage today. :)
 
Hi there


Took it to local Jaguar specialist, went forward, backward, CLUNK! They were like we know that sound, its your hub bolt (big one in centre 32mm socket) and the splines moving. Common problem on the XF supposedly which had a recall issued for it.

Anyway they whipped rear wheels of and check to see if hub bolt was lose, it was not but it did tighten a further 5-6 degrees on each side.

Clunk now seems to be gone. :)


They said if it comes back what Jaguar did was to glue the shafts using loctite into the hubs to stop the random clunking, about 1hr work per side but they said Ford would sort it under warranty, so if comes back just take to Ford.

Glad was an easy fix, drive home was incredible fun, race mode engaged. :D
 
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