If that's the case then the props are turning at approx 40 revs per second at 60mph.I read it as the VCU slip ratio at 60 mph is 1 revolution per second? eg the plates in the VCU slip past each other at 1 rev/second?
Not the prop speed?
Sorry to hear it's still not resolved. Did you get measurements from the rear brake balance from the mot tester? I have to admit I didn't think yer vcu had problems when we tested it. Results should be similar to the link below. If higher then factors like rear brakes catching can cause times to increase. My guess is the vibration when slowing down from 50mph, which seems to happen around 20mph, is a vibration from the back, but only under hard braking. That's making me think the brakes are fighting at the back. Most peeps don't realise the vcu has 2 jobs. It's a balance between activating to provide more than normal drive connection through the props, which it doest when wheels spin or stop turning, or under heavy braking when the front tyres squash more so their radius (axle to ground distance) reduces and therefore the differing speeds of the props changes from normal. This has an effect on the vcu. Without having a LR test rig to capture it... the front prop speed would increase if the front wheel radius reduces and the rear wheel radius didn't. A new fred starting from the beginning of yer problems and what's been done so far my help trigger a response from someone who's had similar before.Here we go I will throw a spanner in the works, as I was not sure if my vibration was caused by the VCU not being very good, as told when I had the VCU bearings fitted.
I was getting very bad vibration before having the bearings fitted this then went to moderate vibrations, I then changed all break discs and pads added new break cables, I have let these bed in for a few weeks and I am still getting very slight vibration on braking ? so my next step of thought was to change the VCU front propshaft and rear propshaft.
I purchased GKN VCU front and rear shafts fitted them yesterday using the same mounts that was fitted by Bell Engineering as I was assured they are of good quality so did not purchase any new ones, will all the above fitted I can honestly say there is no difference in the drive of the FL 1 reversing or forward circle turning and I am still getting the slight vibration braking from 50mph to 0mph therefore it could not have been the VCU or shafts.
Very costly solution only to find the result is the same the only solace I can take from this is that I am a person that after I purchase a car I like to bring it up more or less new standards so the above would have been changes through age anyways.
I have yet to start my thread on what I have changed on this FL 1 since it was purchased in October last year but as I am an enthusiast it doe's not dishearten me, I am always in the frame of mind if you buy a second hand car you need to remind your self what ever you paid for it add another £1000 minimum to rectify any faults and from there constant preventive maintenance.
Now if I do a one wheel up test remembering that I have all brand new front & rear shafts new VCU bearing along with the new VCU and they are quality parts GKN what time am I looking to fin from the test, can anyone person on here state this cheers Arctic2
If that's the case then the props are turning at approx 40 revs per second at 60mph.
So he would be saying the vcu slips 1 full rotation for every 40 turns of the props at that speed.
That would make the % difference between the 2 props 2.5% instead of 0.8% or 0.2%.
That's assuming perfectly matched tyres and driving in a straight line.
2.5% is quite high though. I think it was more of a guess. We'd have more problems than we have if the % increased. I have tried turning a vcu as fast as I can. You certainly need to secure the other end.Now that sounds more plausable
You try turning a VCU 1 revolution in 1 second you would break something :rolly:
2.5% is quite high though. I think it was more of a guess. We'd have more problems than we have if the % increased. I have tried turning a vcu as fast as I can. You certainly need to secure the other end.
If you run 4x4 with all wheels in the air the vcu will activate to turn the rear wheels all the time. Reconners buy vcu's. Some sell them one ebay.Is this on or off the car ? can the car be lifted off four wheel gear engaged and then watch the VCU and shafts turning, if so as anybody tried this ? the VCU I took of was also a GKN and I really doubt there is anything wrong with it, are they of any value second hand ?
If you run 4x4 with all wheels in the air the vcu will activate to turn the rear wheels all the time. Reconners buy vcu's. Some sell them one ebay.
Some pic's at the bottom of this fred:Thanks for that another quick question for those reading this are the small discs on the VCU in the photo the right way round ? or should they be the other way please cheers Arctic2
Some pic's at the bottom of this fred:
http://www.landyzone.co.uk/lz/f69/freelander-1-vcu-bearing-replacement-how-guide-156068.html
Some don't bother with them but they do help protect the bearings from some splash.
It's best to fit them the way I (we do) so the muck spins out away from the bearing. Most would leave them as they are now they're on. Bearings tend to fail because they're cheap, but I get the feeling not all will have gone to the efforts you have to put them on squarely, which I believe will give them a longer operational life time.Great so they are only used as splash guards and it doe's not matter which way round they are, well I hope not as I fitted them the way they came off when they were fitted at Bell Engineering, but yours seem to be fitted the other way round ? video of the VCU being spun round I doubt anything can be assessed by this but it seemed to run smooth ?
https://www.youtube.com/watch?v=hZAUFP8zX6E
Rest assured the VCU's on Gaylanders and P38's do seize.Hi all , been reading these threads with interest but the great has certainly worn-off - in fact I wish I never started.
Please forgive me if I've miss-read or there is an explanation somewhere but this test, surely with out diff-lockers on all your doing is prove that windup won't happen on your transmission system?
Silicone viscous fluid - From what I've read there is no evidence that this fluid will solidify. The only way i can find on the net of the Degradation of a silicone fluid is that I can find is due to oxidation (there are some oil company that are doing some research!!!)
So my understand is thus (from the guys on this site and interweb) the VCU is primarily there to protect the rear drive system from the brute force of power from the IRD (and maybe allow for slippage for motorway driving due to being in permanent 4x4??)
Therefore rather than focusing on VCU as the culprit, surely is it not a bearing issue?
Does anyone have a video of a seized or non-seized VCU?
Again please excuse any ignorance and this is not an intention stepping on anyone toes.
Note: The lengths people have gone to find out what's happening here is worth handshake, so thanks guys
What has that got to do with a Gaylander?This is how they do-it on a VW with T3 syncro - sorry it only in German....
https://www.youtube.com/watch?v=slujJmXoSAo
Please forgive me if I've miss-read or there is an explanation somewhere but this test, surely with out diff-lockers on all your doing is prove that windup won't happen on your transmission system?
Silicone viscous fluid - From what I've read there is no evidence that this fluid will solidify. All I can find on the net about the degradation of a silicone fluid is that it will only happen with oxidation, which is unlikely in the sealed unit!
So my understand is thus (from the guys on this site and interweb) the VCU is primarily there to protect the rear drive system from the brute force of power from the IRD (and maybe allow for slippage for motorway driving due to being in permanent 4x4??) so if the silicone and the plate within the VCU are to not fault is the culprit the bearing?
Can anyone please prove a VCU seizure, and/or Does anyone have a video of a seized or non-seized (slack) VCU?
Again please excuse any ignorance and this is not an intention stepping on anyone toes.
Note: The lengths people have gone to find out what's happening here is worth handshake, so thanks guys