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  #1  
Old 11th-December-2012, 21:09
Crowbaglandyowner's Avatar
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Default Vcu testing

So I've looked at the vcu testing threads and I'm trying to tie down which is the best to apply? I've just done a few miles in the hippo on relative straightness, pulled over and physically felt the vcu and it was cold! From what I can make out this is a good thing. Is it? Is it a worth while test? Came back the same way 'off road' (mild easy crispy green lanes) and the same result! cold.

Another one to 'look' for so I've read, is to check the tyres for wear on every second tread, is this true/useful?

I've tried manually turning the props and it rotates slightly (maybe 2-3mm), is this normal?

All the tyres are the same make and size.

The rear viscous support bearing was replaced in September this year?

I can hear I little wine whilst driving (all gears and neutral) which I think is tyre noise as it gets more high pitched when on freshly laid road surface.

Freelander td4 05 plate 71000k.

All this in mind, do I have anything to worry about? Or do I get digging deep in the bottomless pit that is the pocket?

Cheers,

P.s I'm fairly inexperienced at all this so bare with me

Mike.
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  #2  
Old 11th-December-2012, 21:11
Crowbaglandyowner's Avatar
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Default Re: Vcu testing

Quote:
Originally Posted by Crowbaglandyowner View Post
So I've looked at the vcu testing threads and I'm trying to tie down which is the best to apply? I've just done a few miles in the hippo on relative straightness, pulled over and physically felt the vcu and it was cold! From what I can make out this is a good thing. Is it? Is it a worth while test? Came back the same way 'off road' (mild easy crispy green lanes) and the same result! cold.

Another one to 'look' for so I've read, is to check the tyres for wear on every second tread, is this true/useful?

I've tried manually turning the props and it rotates slightly (maybe 2-3mm), is this normal?

All the tyres are the same make and size.

The rear viscous support bearing was replaced in September this year?

I can hear I little wine whilst driving (all gears and neutral) which I think is tyre noise as it gets more high pitched when on freshly laid road surface.

Freelander td4 05 plate 71000k.

All this in mind, do I have anything to worry about? Or do I get digging deep in the bottomless pit that is the pocket?

Cheers,

P.s I'm fairly inexperienced at all this so bare with me

Mike.
Ignore the ? On the viscous support bearing bit?
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  #3  
Old 11th-December-2012, 21:11
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Default Re: Vcu testing

its allways a good idea to check with 1 rear wheel up regulary you will get a feel for when it eventually stiffens
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  #4  
Old 11th-December-2012, 21:13
Crowbaglandyowner's Avatar
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Default Re: Vcu testing

Quote:
Originally Posted by jamesmartin View Post
its allways a good idea to check with 1 rear wheel up regulary you will get a feel for when it eventually stiffens
Cheers pal, wasn't sure about that one as I heard mixed reviews.
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  #5  
Old 11th-December-2012, 21:13
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Default Re: Vcu testing

Quote:
Originally Posted by Crowbaglandyowner View Post
So I've looked at the vcu testing threads and I'm trying to tie down which is the best to apply? I've just done a few miles in the hippo on relative straightness, pulled over and physically felt the vcu and it was cold! From what I can make out this is a good thing. Is it? NO! Is it a worth while test? YES Came back the same way 'off road' (mild easy crispy green lanes) and the same result! cold.

Another one to 'look' for so I've read, is to check the tyres for wear on every second tread, is this true/useful? IT HELPS

I've tried manually turning the props and it rotates slightly (maybe 2-3mm), is this normal? IMPOSSIBLE TO SAY

All the tyres are the same make and size. NEW ON BACK?

The rear viscous support bearing was replaced in September this year?

I can hear I little wine whilst driving (all gears and neutral) which I think is tyre noise as it gets more high pitched when on freshly laid road surface.

Freelander td4 05 plate 71000k.

All this in mind, do I have anything to worry about? ALWAYS Or do I get digging deep in the bottomless pit that is the pocket?

Cheers,

P.s I'm fairly inexperienced at all this so bare with me

Mike.

Do the test!
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  #6  
Old 11th-December-2012, 21:17
Crowbaglandyowner's Avatar
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Default Re: Vcu testing

Quote:
Originally Posted by The Mad Hat Man View Post
Do the test!
Why isn'tit being cold a good thing?

Tyres look fairly new all round.

Do the test? The rear wheel one ?
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  #7  
Old 11th-December-2012, 22:12
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Default Re: Vcu testing

Quote:
Originally Posted by Crowbaglandyowner View Post
Why isn'tit being cold a good thing? BECAUSE IT WORKS BY GETTING HOT!

Tyres look fairly new all round. THATS NOT WHAT I ASKED.

Do the test? The rear wheel one ? YES
Always fit new tyres on the back.
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  #8  
Old 11th-December-2012, 23:03
Crowbaglandyowner's Avatar
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Default Re: Vcu testing

Quote:
Originally Posted by The Mad Hat Man View Post
Always fit new tyres on the back.
I was under the impression it only mainly got hot when under load? I.e loss of traction for example? Causing the fluid to go gel like and stiffen up transfering the drive to the rear wheels. Driving normally (even though in 4wd) predominately use 2wd right?

Forgive my ignorance, as I said, not very experienced
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  #9  
Old 11th-December-2012, 23:26
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Default Re: Vcu testing

It appears that it gets warm in normal use.

Cold could mean it is seized.
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  #10  
Old 12th-December-2012, 00:53
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Default Re: Vcu testing

Cold could mean it's open circuit too, like one of them useless vcu's which don't allow drive to the rear wheels.

Temp is a good general test as it gives an idea if the vcu is being over worked. More work means higher temp, until it reaches a certain temp when it's considered "seized". It's not actually seized in a bad way. It's just locked up as it's been pushed to activate due to differing prop shaft speeds (front to rear) or a spinning wheel like oft road. Locking up is a good thing, but not whilst driving on a tarmac road as this will potentially put more stress into the transmission.

I've never come across results for a cold vcu after a drive. If we keep testing then we’ll find out if cold vcu's do exist and they're not a problem. Try the One Wheel Up Test to confirm if your vcu is permanently seized or open circuit. Also tell us what speed you were driving at and the distance prior to the Turnip Test (measuring temp of vcu).

EDIT: Having said that mine felt cold at 8 degrees this morning but the air temp was -3 degrees. Usual short distance so it's not a concern for mine.

Last edited by Hippo; 12th-December-2012 at 23:56.
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