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Clonking on full lock

1.6K views 17 replies 10 participants last post by  LFrosty  
#1 ·
I'm in the process of ironing out all of the little issues on my 180, and one which is particularly perplexing is a slight clonking noise. The conditions are as follows:

* Happens on both right and left turns.
* Requires at least 3/4 of a turn of lock.
* Only at very slow speeds. Most noticeable pulling away. T junctions etc.
* The faster I pull away (loading up the outside wheel), the more evident it is. No noise at all with a slow pull away.
* Sounds like it's coming from the inner end of the driveshafts.
* Sound is proportional to the speed (I think).

I changed an outer CV joint last night to see if it improved, as sounds can often travel. It has not improved it.

My best guess is the inner CV joints, but I can't find them for sale anywhere. I'd like to test one of those and see if that's to blame. Does anyone know if they are available anywhere?

Any other ideas? Do the diffs in these cars ever fail? The car is driving great - it's only under specific conditions that I notice the noise.
 
#2 ·
if you suspect either inner c.v's,try un-clipping both sides,and re-greasing them both.they wear less than the outers as they move 'up and down' as opposed to what the outers have to do.its worth doing to see if it cures it,you can do it in-situ.
 
#4 ·
Given that the noise is steering-dependant, I doubt it's an inner CV joint (unless the boot is damaged).

As Popeye said, the other outer CV joint must be favourite, and as you have surmised yourself, the differential is a possibility.

You may be able to test the differential by jacking one wheel up, but if you try it, leave minimal ground clearance and put the handbrake on real tight - a faulty diff could cause the other wheel to pull you off the jack. HOWEVER, this would be a no-load test, so to be sure, you'd also need to apply the brakes (and do the other side afterwards).
NOTE : I'm not recommending this procedure, merely pointing out the possibility.
 
#5 ·
If you have to buy any mechanicals, try RockAuto, they are only just getting going in the UK, but their prices for the shaft with inner and outer CV's was the same as what we paid just for outer CV's (mk2 Golf) the othe week from Eurocarparts (Trade Price!)
 
#7 ·
The inner CV joint rubbers are in good condition so I don't think any muck has ever got in, but I'll try re-packing them and see if that helps things at all.

Would the passenger side outer CV joint make noise on left hand turns as well as right if it was faulty do you think? I'm trying to decide if it's worth replacing that one too.
 
#8 ·
Symptoms seem to be exactly the same as mine, only mine only really does it in reverse at 3/4 lock, mine sounds like its drivers side but having a couple of people have a listen at a past South meet it is indeed a knackered passenger side outer joint.
 
#10 ·
After a bit of poking around last night, I think I have found the issue. Here is a video of the passenger side driveshaft. It's the output flange of the diff that I'm moving, and it seems to have a bit of lateral play.

The rotational play I think is normal, but it's the in and out play which I think is causing the noise. Does this look normal?

http://www.youtube.com/watch?v=8CP5M5AMSRM
 
#17 ·
There are other options too.

When I changed the ABS rings, I left the brake calipers on, I loosened the hub nuts with a 32mm socket directly on the breaker bar while the wheel was still on the ground, and I didn't use a ball joint splitter of any description.

http://forums.mg-rover.org/showthread.php?t=432315 (no photos).

That's not to say that my methods are right and others are wrong, just that there's often more than one way to do something.
 
#18 ·
Just to update this thread, I can confirm that both CV joints were noisy. I changed one and still had noise. I found the other ABS ring was cracked, so changed that side too, and the noise just went away.

It's a pretty easy job to do if you are a basic DIY mechanic. The hardest part is breaking the driveshaft nuts loose as you'll need a very powerful impact wrench. I used a 240v mains operated one (450nm of torque). That, some heat, and some penetrating oil and they were off.

I split the lower and upper shock absorber ball joints to make it easier. The Haynes manual has a good guide for the whole process.