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[p j morgan]

have you looked at your half shaft or back wheel bearings ?the grinding sounds like half shafts.have a look and see if you can slide your half shaft from side to side ? hope this helps

[Tonka.]

Posted earlier about an odd noise from the rear. From my initial post I led people on OOF to point towards a wheel bearing fault. It seems this is not the case............

Just to recap, the rumbling grating only appears when turning left at slow speeds with the engine under load (i.e. not coasting).
During high speed left hand cornering and in a straight line the noise is not present.
It can make the noise when sat stationary in 'D' and I blip the throttle.
It also seems to come more from the centre/rear of the car. Sound does travel I know.

I have had the wheels laser aligned and balanced to put them out of the equation.

I am having trouble remembering when I first heard this noise but, to list what I have done may help.

I have replaced the rear springs which of course involved dropping the rear diff etc
I have replaced the gearbox which involved removing the cat sections
The gearbox has fresh Dex III in and the diff has fresh EP 90 in it.

I am quite confident though that it was fine before I changed the box and the springs. But it may have been there before and i just didn't notice.

I have now had it though three garages including Vx   and they all give me different opinions leaving me rather confused  

If any one has come across this before could you point me in the right direction.  

Thanks in advance guys and gals  

Check your Engine and Gearbox mounts for condition and security.
I had the same problem on my old Merc 190 and found that one of
mounting bolts had worked loose. This allowed the engine and
drivetrain to wind-up and twist out of line in reaction to the torque
delivered by the engine and grind and vibrate against the chassis.
On mine it happened when taking right hand bends under load
and rattled when blipping the throttle violently when stationary.

I alos had the same thing on a Singer Vogue (that takes me back
a bit) when one engine mount disbonded and caused light tramping
on the rear axle.

Just a few thoughts as you seem to have already checked the obvious

Good idea. As I have had the gearbox out and dropped the diff you may have something.

I tightened the bolts etc to the specified torque value. I will remove them, reloctite them then retorque them. With an extra little grunt after the click  

[Tonka.]

have you looked at your half shaft or back wheel bearings ?the grinding sounds like half shafts.have a look and see if you can slide your half shaft from side to side ? hope this helps

Wheel bearings have no play and run freely. It is not a constant rumble

The half shafts do move in and out of the hub and the diff. They surely need this play to alow the suspension to move  :-/

[p j morgan]

sounds like that is your problem you have to push them in with a lot of force you should hear a click and then try moving it from side to side you should have a bit of play  

[iainb]

Do you tow a caravan or has it in the past ?

[Tonka.]

Do you tow a caravan or has it in the past ?

The car came without a towbar and no sign of one being fitted. I fitted a towbar with the intention of pulling our five berth. I picked the van up to bring it home for the summer and that is when I noticed the noise.

The car has towed for ten miles. That is it !!!  

[Tonka.]

sounds like that is your problem you have to push them in with a lot of force you should hear a click and then try moving it from side to side you should have a bit of play  

Okay, I'm listening    

It doesn't take a lot of effort to move them in and out. How much play should I have ?

[p j morgan]

do you no if its a heavy grinding noise like metal to metal

[iainb]

I personaly check the exhaust and make sure its not bumping when turning a corner and whilst under the car I would check the drive shaft for lateral movement (thats orbiting) as it maybe a joint is gone dry.
Its not impossible that changing the diff oil high lighted the issue.

[Tonka.]

do you no if its a heavy grinding noise like metal to metal

Got me there, but yes, I think it is but more of a rumbling  

[Tonka.]

I personaly check the exhaust and make sure its not bumping when turning a corner and whilst under the car I would check the drive shaft for lateral movement (thats orbiting) as it maybe a joint is gone dry.
Its not impossible that changing the diff oil high lighted the issue.

I have wedged the exhaust with rubber and it has had no effect  

I don't know how to check the drive shafts or orbiting but as I have said they do have sideways movement. :-/

The noise was there before I changed the diff oil  

[p j morgan]

i was wondering could it be your cv joint on the prop? but the it would be there all the time you did say that you could get the noise in drive whilst you was still which led me to the cv jouint?

[Tonka.]

i was wondering could it be your cv joint on the prop? but the it would be there all the time you did say that you could get the noise in drive whilst you was still which led me to the cv jouint?

Yes thats right. Sat in traffic in drive, a blip of the throttle produces the sound and the car travels around one meter  

[iainb]

The joint in the prop shaft and drive shaft should be the same and suspect that one or both drive shaft joint could need some attention.
It may be cheaper to change the drive shaft than to repair it as there are some car breakers who are members of this site.

A decent mechanic should be able to diagnose this problem ........

[p j morgan]

i can not seem to put my finger on it if mark dtm was online he would tell you straight away .have a look at your cv joint towing the caravan might have caused it to  start to  :ysplit .sorry i could not be of any more help .