Knocking from rear diff on tight turns?

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sailorden

New Member
Posts
29
Hi

I have slight knocking (from rear diff area) on really really tight slow turns.

1. I have changed all three diff mounts

2. I have 'tippex' tested the VCU

3. I have 'torque' tested the VCU

4. Fitted new Brake shoes, discs, pads, cylinders. pipes and hoses.

5. Fitted alloys and brand new tyres

The only thing things that I can see are :

1. VCU bearings are not 100% rigid in the support bracket (should they be?)

2. Slight leak from Diff oil filler plug (or prop shaft oil seal) - Still trying to work out which (or maybe its just residue after I refilled the diff oil).


The local garage cant figure it out and neither can I.

Any ideas guys & girls?

Thanks in advance

Den
 
By the way I also repaired the drivers side rear sub frame mount (Welded in new plate) as recommended. It solved the creaking chassis problem!!

Thanks for the advise

Den
 
if you jack up rear axle ,do the wheels counter rotate when you spin one of them, is there a brake holding on, ie handbrake cable seized.
 
Hi

When I jack up the back and rotate one wheel the other whell goes the other way.

Both Wheels rotate freely when the hand brake is off.

So that looks ok,

What about the VCU bearing housing should there be any play in that?

Thanks
Den
 
hi

I had the same problem as this i was just about to replace the diff when the rear silencer box went and took priority just as well as when i replaced the rearsilencer the knock on turning disappeared worth a good look as i had shook and pushed the rear silencer and could not get it make any sound and had discounted that being the problem months before
there should not be excessive play on vcu bearings

Good luck

Gordon
 
Hi

I took of the old Exhaust and then drove it without one up the road and the noise was still there.

I have now replaced the exhaust with a brand new one and replaced all the mounts. For a moment I thought that it may be hitting the sub frame, but it looks ok.

The rear VCU bearing looks like it has movement as I can 'waggle' the rear pop shaft side to side a bit so thats the next item for attention.

At this rate I will have rebuilt the whole jeep thing shortly!

If anyone has any ideas I would be gratefuly

Thanks
Den
 
Hi

I took off the prop shaft and VCU unit. And guess what the Freelander runs like a dream.

It just shows you the tippex test, the bar turning wheel test Hah!

Now the question is - 4 wheel or 2 wheel that is the question!

Thoughts please!

Thanks Den
 
Hi

Split the prop shafts from the VCU unit (now that's a tough job) but thanks to the forum.

http://www.landyzone.co.uk/lz/f9/vcu-prop-removed-bearing-swap-help-am-stuck-99483.html

Gave it some serious grief with a lump hammer and cold chisel!

Checked both bearings, one was ok, but the other was sticking at one point when you turn it, maybe it was just sticking enough to give the rear diff some pain.

Anyway i will replace the bearings and then put the whole thing back together and then lay on the drive and stick it back on.

If it still has the noise then I will remove it and stuff it I will keep it as 2 whell drive and get a blanking plate for the IRD.

All in a days work for a Junior Landyzone member!
 
Hi

I went mad an bought a recon VCU unit and bearings, stuck it back together and then drove it.

Still the noise on tight turns, and it feels like it will do real damage if I leave it on.

I took it off and it drives like a dream.

So if it isnt the vcu, the bearings, the brakes then what is the problem.

This is driving me insane!

Thanks for your feedback.
 
obviously there is trouble in the diff itself, if you jack one side of the car, (both front and rear wheels off the ground) and run the car thro the gears does the noise show itself?
 
Sounds to me like you have a problem with the diff, its possible it has been wound up at some point and done damage LR recommend tight turns are not done on a regular basis as it forces the wheel speeds and ratio;s to function at different speeds.
I say, run it as a 2WD until you can strip the diff
 
Just as a final try. I replaced the bearings with a higher quality branded bearing, and guess what it drives fine with no issues!

One off the bearings that I took off had a 'flat' spot and with a 'new' recon VCU unit it all works well.

A happy ending to the saga,

Thanks for all the help from this forum!
 
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