and what exactly did that achieve?
and what exactly did that achieve?
jamesmartin
Well-Known Member
an unexchangeable unit
Hippo
Lord Hippo
Can you try the one wheel up test as shown in me video below and let us know the result? Thanks.
jamesmartin
Well-Known Member
vcu has had it if wheel wouldnt turn stiffly but turn
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SO U THINK ITS REALLY HAD IT?? when i did one wheel test i could move wheel a few cm, then nothing, i dodnt want to try and force it round as i was lead to believe that it should move round albeit slowly without a lot of force, that is right yeah?
jamesmartin
Well-Known Member
no viscous couplings are stiff the faster more power you use to turn them the stiffer they get ,if it wont turn its siezedSO U THINK ITS REALLY HAD IT?? when i did one wheel test i could move wheel a few cm, then nothing, i dodnt want to try and force it round as i was lead to believe that it should move round albeit slowly without a lot of force, that is right yeah?
Hippo
Lord Hippo
It does sound like the vcu is past it's best. To be sure you could try the test on a rear wheel, with the hand brake off. If your concered your hand brake may still be applied, lift both rear wheels and turn 1. It will turn the other easily. Don't lift both during the vcu test.
Also can you time the test you perform and give us the time, weight and distance of weight to pivot point?
Also can you time the test you perform and give us the time, weight and distance of weight to pivot point?
woteffa happened to this thread being for results, so we could colate some meaningful figures?
Kizzeh
Well-Known Member
I could be wrong but i should think its because you lifted your front off the ground. This is the side of the gearbox and if you applied too much pressure all you would do is rock the car off the jack. Try the rear.
Only just read the thead. will try the test tomorrow if i remember
Kizzeh
Well-Known Member
I could be wrong but i should think its because you lifted your front off the ground. This is the side of the gearbox and if you applied too much pressure all you would do is rock the car off the jack. Try the rear.
Only just read the thead. will try the test tomorrow if i remember
andyfreelandy
Well-Known Member
I've just sold my V6 and bought a TD4 2002. The TD4 is in great condition but grinds on tight lock so have read all of teh thread with interest. What I can't find are the results !!!
In an effort to support this forum I have carried out the rear wheel in the air torque test on the V6 (which was seemingly fine) and the TD4 which is grinding when on tight lock and is off for a new VCU on Wednesday at Bell Engineering.
In order to try to get some 'measurement' of the force required to turn the wheel I used a torque wrench on the centre nut and adjusted it until I could 'just' turn the wheel with a steady force and without the torque wrench 'clicking'. I observed around 60 lb ft for the V6 and around 80 lb ft for the TD4. Will let you know what the replacement unit registers. I know that this is not an exact science, but an 'on car' measurement is long overdue!!! For the record the V6 has done 70k and the Td4 80k. Cheers and any more figures welcomed.
In an effort to support this forum I have carried out the rear wheel in the air torque test on the V6 (which was seemingly fine) and the TD4 which is grinding when on tight lock and is off for a new VCU on Wednesday at Bell Engineering.
In order to try to get some 'measurement' of the force required to turn the wheel I used a torque wrench on the centre nut and adjusted it until I could 'just' turn the wheel with a steady force and without the torque wrench 'clicking'. I observed around 60 lb ft for the V6 and around 80 lb ft for the TD4. Will let you know what the replacement unit registers. I know that this is not an exact science, but an 'on car' measurement is long overdue!!! For the record the V6 has done 70k and the Td4 80k. Cheers and any more figures welcomed.
Hippo
Lord Hippo
Your results won't give an easy true comparison. You need a special 2x bar type torque wrench to do the test with a torque wrench. You need to do the "one wheel up test" as below, which uses gravity as a datum:
http://www.landyzone.co.uk/lz/1628997-post6.html
Reason why http://www.landyzone.co.uk/lz/1470266-post35.html
Video below in me signature.
andyfreelandy
Well-Known Member
O.K - got the recon unit fitted and noise on full lock disappeared (although a front diff mount to replace as noted as faulty).
Done the torque wrench test on this one this morning. It registers 35 lb ft.
Now - I acknowledge all the comments about this not being accurate etc, but what we need is a 'go-nogo' test that can be done with the VCU fitted to the car with tools that most people will have.
My experience has shown that if you use a standard torque wrench applied to the centre nut on a rear wheel in the air and;
1) set wrench to around 30 lb ft.
2) apply just enough force to get wheel to move slowly and adjust torque wrench (upwards) just enough to prevent the torque setting click occuring then take the reading when the wheel turns smoothly.
Ignoring the fact that the V6 has different axle ratios (it is an order of magnitude difference so I personally think we can ignore these). A reading of 30 - 60 lb ft shows a 'fair' VCU and a reading over 60 shows a VCU that may require and warrant the effort of a professional check.
This simple, measured test may save us all a load of expense with secondary damage.
What say others???
Cheers, Andrew
Done the torque wrench test on this one this morning. It registers 35 lb ft.
Now - I acknowledge all the comments about this not being accurate etc, but what we need is a 'go-nogo' test that can be done with the VCU fitted to the car with tools that most people will have.
My experience has shown that if you use a standard torque wrench applied to the centre nut on a rear wheel in the air and;
1) set wrench to around 30 lb ft.
2) apply just enough force to get wheel to move slowly and adjust torque wrench (upwards) just enough to prevent the torque setting click occuring then take the reading when the wheel turns smoothly.
Ignoring the fact that the V6 has different axle ratios (it is an order of magnitude difference so I personally think we can ignore these). A reading of 30 - 60 lb ft shows a 'fair' VCU and a reading over 60 shows a VCU that may require and warrant the effort of a professional check.
This simple, measured test may save us all a load of expense with secondary damage.
What say others???
Cheers, Andrew
jamesmartin
Well-Known Member
nearer the mark and done regulary shows any stiifening and gives time to arrange replacement ,
sounds a good simple system, but the usual method involves a known length pole, a known weight and a known angle of displacement (normally 2 Oclock-5Oclock) and the time taken is measured. using a torque wrench has been thought of before, but I think it was discounted. I would like to see Bells comments on this.....
results are here
results are here
andyfreelandy
Well-Known Member
Thanks for link to results.
Not sure what the 'Force' column is, but interestingly a new one at 5Kgm is around 36lbft and a 77k miles one at 9.6Kgm is around 70lbft - this ties in with my results precisely. maybe it is the same test recorded for completeness?
Andrew
Not sure what the 'Force' column is, but interestingly a new one at 5Kgm is around 36lbft and a 77k miles one at 9.6Kgm is around 70lbft - this ties in with my results precisely. maybe it is the same test recorded for completeness?
Andrew
