Another transfer box query

RobCavendish · Feb 28, 2011

Does anyone know whether a RRC viscous coupling is likely to be damaged by an MOT rolling road brake test, if a two wheel road is used, as this is all that most garages have? My MOT is due shortly and I really don't want the brake test to damage my new viscous coupling. On a similar vein, is it important to keep the diameter of all tyres similar in order to keep the VC happy?
Thanks again for your interest, I hope that all these transfer box questions are not too boring, I'll move on to something else soon

juiceyv8 · Feb 28, 2011

Yes tyres must be within 2mm of each other to prevent wind up.

Volvo v70R has viscous.(and has this problem 1200quid job)

same as Xc90 volvo.

I wouldnt take a chance on the rollers myself.

vougese39 · Feb 28, 2011

As far as I am aware the range rover is not that critical on Tyres yes you can use a 2 wheel rolling road as long as it is a very new double clutch rollers but not many have them unless it is a very new test station

Cavey_P38 · Feb 28, 2011

i have only been to the tessting station once with our range rover, they did a manual brake test with a device they put in the footwell and drove the car up the road>

Believe that is fairly normal for a car with permanaent 4 wheel drive

Our local testing station is fairly switched on as we are a rural area and he runs a 4 x 4 himself

Andy_J · Feb 28, 2011

I have always been told, that you can't test a permanant 4x4 on a set of 2 rollers, they either need 4 rollers or use the footwell device.

Was also told that you cat put a car with an LSD ona 2 roller system

jamesmartin · Feb 28, 2011

i would want all four wheels turning even if vc is protected theres still diff thats not going to like sudden spinning

seanmull · Feb 28, 2011

when i took my p38 dse for test (ireland) they didnt put it on the rolling road thats a while back but im being tested tomorrow so will post tomorrow evening/night

sassanach · Feb 28, 2011

a modern rolling road will have a "4 wheel drive" mode,basically one wheel rotates in the opposite direction to the other on the same axle.

seanmull · Mar 1, 2011

went for test today and no rolling road used

RobCavendish · Mar 1, 2011

Thanks everyone for your thoughts on this issue, I'll be asking my local MOT station to carry out a road test rather than risk the rollers!
The idea of contra rotating wheels sounds like a good one though, I've not heard of that idea before.

kernowdragon · Mar 1, 2011

RobCavendish said:
Thanks everyone for your thoughts on this issue, I'll be asking my local MOT station to carry out a road test rather than risk the rollers!

A good tester should know better anyway!

Another transfer box query

RobCavendish

New Member

juiceyv8

New Member

vougese39

Well-Known Member

Cavey_P38

Well-Known Member

Andy_J

Active Member

jamesmartin

Well-Known Member

seanmull

Active Member

sassanach

Well-Known Member

seanmull

Active Member

RobCavendish

New Member

kernowdragon

Well-Known Member

Similar threads