yu would expect the UJ's to generate heat, as they are continuously working.
yu would expect the UJ's to generate heat, as they are continuously working.
Nodge68
Well-Known Member
The whole shaft is hot not just the joint! It can only be warmed heat from the engine or from the exhaust?
If you can, can you do a test after a nice 15-20 mile+ journey while it is warmed up fully? Ta!!
Ok will do.. next time I get back from a journey and the wife isn't around (to moan about my misuse of time) then I will do so
Hippo
Lord Hippo
It's possible some of the high results we're seeing are down to tight rear diffs. could also be rear brakes catching. Any suspect vcu's with high times for the one wheel up test should be removed and bench tested as follows. Bench testing tests just the vcu on it's own without any possible transmission tightness interfering with the results.
With the props still attached to the vcu, clamp 1 side of the vcu stationary (I put a long screw driver through the uj on one side of the vcu and held the screw driver stationary with a work mate) and put a 2nd long screw driver through the other uj on the other side of the vcu. Put a weight on the end of the 2nd long screw driver and time it to see how long it takes to turn 45 degrees to the horizontal.
Using a weight of 5.2kg and length 34cm = 17Nm = 67 seconds
Using a weight of 10.2kg and length 38cm = 38Nm = 23 seconds
As the Nm force is lower (due to a shorter distance between the weight hanging oft the screw driver, to pivot point) the times will be higher, when compared to the one wheel up test.
With the props still attached to the vcu, clamp 1 side of the vcu stationary (I put a long screw driver through the uj on one side of the vcu and held the screw driver stationary with a work mate) and put a 2nd long screw driver through the other uj on the other side of the vcu. Put a weight on the end of the 2nd long screw driver and time it to see how long it takes to turn 45 degrees to the horizontal.
Using a weight of 5.2kg and length 34cm = 17Nm = 67 seconds
Using a weight of 10.2kg and length 38cm = 38Nm = 23 seconds
As the Nm force is lower (due to a shorter distance between the weight hanging oft the screw driver, to pivot point) the times will be higher, when compared to the one wheel up test.
Hippo
Lord Hippo
Not everyone has a 32mm socket to perform the one wheel up test using the 32mm nut in the centre of the wheel. This I can appreciate. However, some have tried to use the normal wheel nuts (5 of them) used to hold the wheel on. Please don't do this as you risk snapping the nut off it's stud. This has happened to a forum member recently so I'm putting this here as a warning to all.
The longer the bar and the greater the weight, the more torque (stress) you put on the nut. The centre 32mm nut can take it as it's fekin tight and strong. The normal wheel nuts (5 of them) can't. The typical weights and bars we're using aren't too bad, as they're putting a similar amount of pressure on the nut that you would do to tighten it yourself. Yes it can probably take a lot more torque but there's no point in risking this or trying to find a weak point. Safety takes preference.
I would prefer peeps didn't use the wheel nut (5 of them) for the one wheel up test. Using longer bars or higher weights increases the chances of the wheel nut snapping off.
The longer the bar and the greater the weight, the more torque (stress) you put on the nut. The centre 32mm nut can take it as it's fekin tight and strong. The normal wheel nuts (5 of them) can't. The typical weights and bars we're using aren't too bad, as they're putting a similar amount of pressure on the nut that you would do to tighten it yourself. Yes it can probably take a lot more torque but there's no point in risking this or trying to find a weak point. Safety takes preference.
I would prefer peeps didn't use the wheel nut (5 of them) for the one wheel up test. Using longer bars or higher weights increases the chances of the wheel nut snapping off.
The cost of a 32mm socket is a small cost compared to the prospective risk & cost of not checking the VCU.
As in all things on this forum. It is at your risk.
As in all things on this forum. It is at your risk.
Hippo
Lord Hippo
Well said.
htr
Well-Known Member
1998 FL1 1.8 petrol 184000km [ 114000mls] - 1.2m bar VCU 'cold' no run done.
1st weight 3.2kg = virtually no movement from 45º, veerry slow to move at all.
2nd weight 4.2kg = slow movement - 10.54mins to horizontal from 45º
3rd weight 5.2 kg = a bit faster = 9.44 mins to horizontal from 45º
I know my VCU is shot as there is a lot of wind up in reverse and forwards on lock.
1st weight 3.2kg = virtually no movement from 45º, veerry slow to move at all.
2nd weight 4.2kg = slow movement - 10.54mins to horizontal from 45º
3rd weight 5.2 kg = a bit faster = 9.44 mins to horizontal from 45º
I know my VCU is shot as there is a lot of wind up in reverse and forwards on lock.
busa1300
Member
FL TD4 2002 70k miles
Reading all the posts has made me concerned. Rear right wheel jacked up, I can just about turn the wheel using hands on outer diameter of tyre. I marked two white marks on front and rear prop where they could be seen prior to the gurning!! After the "red sock" tucked back in my rear end, viewing the two marks they have split alignment. My main concern is having only had the thing 5 months it won't roll down a medium grade incline (in neutral) unless steering is straight ahead , if you apply steering turn whilst she's rolling it comes to a stop with a brake type rubbing sound from the VCU. Anyone else tried this?? Is this the norm?
Cheers
Reading all the posts has made me concerned. Rear right wheel jacked up, I can just about turn the wheel using hands on outer diameter of tyre. I marked two white marks on front and rear prop where they could be seen prior to the gurning!! After the "red sock" tucked back in my rear end, viewing the two marks they have split alignment. My main concern is having only had the thing 5 months it won't roll down a medium grade incline (in neutral) unless steering is straight ahead , if you apply steering turn whilst she's rolling it comes to a stop with a brake type rubbing sound from the VCU. Anyone else tried this?? Is this the norm?
Cheers
Last edited:
jumble_jobs
Member
Freelander 2006 Td4 93,500 miles
VCU Test
Ambient Temperature 15 degrees C
Car had been stationary for >48 hours
Length of pole 1.2m
Weight = 5 kilos
The following timings are for a traverse from 45 degrees to 0 degrees from the horizontal
Lap 8 000:00:00:59:055
Lap 7 000:00:00:46:774
Lap 6 000:00:00:49:604
Lap 5 000:00:00:55:655
Lap 4 000:00:00:35:816
Lap 3 000:00:01:03:174
Lap 2 000:00:00:49:667
Lap 1 000:00:00:43:500
Average: 000:00:00:50:406
Lap three is ignored as the socket nearly came off and lap 4 is also ignored as it seems too short (in fact ignoring both makes little difference anyway) so :
1 59.06
2 46.77
3 49.60
4 55.64
5 49.67
6 43.50
Total 304.24
Average 50.71
So for a 1.2 m pole and a 5kg weight at 15 degrees C time taken is roughly 51 seconds.
Looking at "Hippo's" graph gives 35.5 seconds however the ambient temp was 23 degrees C.
So I guess this isn't too bad a result just not sure how much difference the temp makes? any comments from those with more experience? I already have a new GKN VCU (from island 4x4) so I will be replacing it anyway but thought I the results may be useful plus I wanted to know if I needed to take the prop off before I could get around to actually changing the VCU.
Many thanks to all those (Specially Hippo and MHM) who have posted on this site and given their time and experience so lurkers like me can take a shorter route.
VCU Test
Ambient Temperature 15 degrees C
Car had been stationary for >48 hours
Length of pole 1.2m
Weight = 5 kilos
The following timings are for a traverse from 45 degrees to 0 degrees from the horizontal
Lap 8 000:00:00:59:055
Lap 7 000:00:00:46:774
Lap 6 000:00:00:49:604
Lap 5 000:00:00:55:655
Lap 4 000:00:00:35:816
Lap 3 000:00:01:03:174
Lap 2 000:00:00:49:667
Lap 1 000:00:00:43:500
Average: 000:00:00:50:406
Lap three is ignored as the socket nearly came off and lap 4 is also ignored as it seems too short (in fact ignoring both makes little difference anyway) so :
1 59.06
2 46.77
3 49.60
4 55.64
5 49.67
6 43.50
Total 304.24
Average 50.71
So for a 1.2 m pole and a 5kg weight at 15 degrees C time taken is roughly 51 seconds.
Looking at "Hippo's" graph gives 35.5 seconds however the ambient temp was 23 degrees C.
So I guess this isn't too bad a result just not sure how much difference the temp makes? any comments from those with more experience? I already have a new GKN VCU (from island 4x4) so I will be replacing it anyway but thought I the results may be useful plus I wanted to know if I needed to take the prop off before I could get around to actually changing the VCU.
Many thanks to all those (Specially Hippo and MHM) who have posted on this site and given their time and experience so lurkers like me can take a shorter route.
Good response. Personally, I would think almost a minute is too slow. Be interesting to see what the new one gives.
Do the test properly. What have you got to loose?
Bojer
Member
Compared with my "old" 120k Freelander which took about 35 secs my "new" 55 reg 80k Freelander took 2 minutes 20 sec with 5kg at 1.1m ( mop handle on T bar!) , booger !
As usual still drives ok , does tickover full lock turns forwards an backwards .
So started looking around for VCUs and maybe an IRD locally and now seem to have bought another whole Freelander..........
As usual still drives ok , does tickover full lock turns forwards an backwards .
So started looking around for VCUs and maybe an IRD locally and now seem to have bought another whole Freelander..........
