2002 Freelander knocking when turning

Hi,
Its my first post and would appreciate some advice.
My TD4 is making a clanking sound from the back of the car when turning on full lock, only when going forward, turning in the driveway & car parks, reversing is okay, it does not feel tight as mentioned on other posts. It has just had a new diff fitted, driving otherwise is quiet and smooth.
Do I need a new VCU or is this problem related with the IRD? The VCU is original and mileage is 80k.

:welcome:

Check for movement in the rear diff centre mount as below. You don't need to take the prop off to do it. Also wobble the prop's and vcu just incase anything is loose. Is the eggsource knocking against anything?

[ame="http://www.youtube.com/watch?v=IoHMz2ItMLE"]Land Rover Freelander 1 2001 v6 Centre Diff Mount Fail - YouTube[/ame]

Whilest you are under there, check that there is no movenment in the VCU bearings. The steel bearings tend to come away from the rubber vibration damper that surrounds them.

Hi, thanks for info, the VCU support bearings were recently renewed in July, I have been underneath for a look, I can move the diff a small amount due to give in the support bushes, how much is it supposed to move?
I have owned this car since new and it is well maintained.

You'll probably be able to move the diff about 1cm with new mounts fitted. 2cm at most. You'll need to take some of it's weight to do that.

Are you sure the clunk is from the rear? The noise can sound as if it's from a different place when your inside and driving. My anti roll bar chose to start knocking on the suspensiopn struts recently. Side ways movement caused this. Thought of this when reading about it happening when turning. Have a look at yours.

Might be worth having a look at the front righthand mount of the rear subframe, the captivated nut can break away and cause a clunking sound.
John

Why was the Diff changed ? Premature failure of the Diff can be caused by a tight VCU (internal fluid becomes thick and prevents the VCU slipping resulting in constant 4 wheel drive) Also seems strange that the VCU centre bearings have been changed without changing the VCU as 70,000 miles is the advised (by the reconditioners) lifespan even though some fail before this and others last longer.

Would be a good time to do the one wheel up test as below in me video to test your vcu.

Hi,
Thanks for the information, the one wheel up test on the VCU proved that it was okay. It turned out to be the rear section of the propshaft which has now been replaced.

Glad you got it fixed, what was wrong with the rear prop ? only thing I can think of is the UJ's and these should have been checked when the diff was replaced.

It has to be one the universal joints, when compared to another shaft though you cannot tell that one is faulty!