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Old 06-14-2005, 00:35   #1 (permalink)
Dunga
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Can MOT testing damage transfer Box?

Just fitted new brake shoes to my 1985, 110, it went for retest at MOT
station and they failed again on the handbrake, now the transfer box oil
seal is knackered and brake shoes are contaminated with oil from transfer
box.

My question is, what sort of damage could the MOT station do by applying the
handbrake while on the rolling road?


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Old 06-14-2005, 00:35   #2 (permalink)
Wolverine
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Re: Can MOT testing damage transfer Box?

Looking at my fuse box cover... it reads...
"A single axle roller rig may be used for speeds up to 5km/h. The centre
differential lock must be disengaged. For roller tests over 5km/h, either
all four wheels must be rotated at the same speed or if only a single axle
roller rig is available, the centre differential must be locked and the
propeller shaft to the stationary axle must be removed."
Was it a 4x4 specialist garage?
Hope this helps.

Wolverine
Big Red 110CSW

"Dunga" <test@test.com> wrote in message
news:42a95f89$0$1735$ed2e19e4@ptn-nntp-reader04.plus.net...
> Just fitted new brake shoes to my 1985, 110, it went for retest at MOT
> station and they failed again on the handbrake, now the transfer box oil
> seal is knackered and brake shoes are contaminated with oil from transfer
> box.
>
> My question is, what sort of damage could the MOT station do by applying
> the handbrake while on the rolling road?
>



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Old 06-14-2005, 00:35   #3 (permalink)
Jeff
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Re: Can MOT testing damage transfer Box?

> "A single axle roller rig may be used for speeds up to 5km/h. The centre
> differential lock must be disengaged. For roller tests over 5km/h, either
> all four wheels must be rotated at the same speed or if only a single axle
> roller rig is available, the centre differential must be locked and the
> propeller shaft to the stationary axle must be removed."
> Was it a 4x4 specialist garage?
> Hope this helps.
>


There are similar warnings about suspended towing;

I wonder if someone could explain the damage mechanism? As I see it a
single roller, or suspended tow is not a lot different to the situation
where one pair of wheels on the same axle are spinning in mud and the others
are stationary. (without the centre diff locked). Surely this is not going
to damage things?

Regards
Jeff


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Old 06-14-2005, 00:35   #4 (permalink)
Fred Labrosse
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Re: Can MOT testing damage transfer Box?

On Fri, 10 Jun 2005 12:39:00 +0100
"Jeff" <jeff@local.host> wrote:

> > "A single axle roller rig may be used for speeds up to 5km/h. The
> > centre differential lock must be disengaged. For roller tests over
> > 5km/h, either all four wheels must be rotated at the same speed or
> > if only a single axle roller rig is available, the centre
> > differential must be locked and the propeller shaft to the
> > stationary axle must be removed." Was it a 4x4 specialist garage?
> > Hope this helps.
> >

>
> There are similar warnings about suspended towing;
>
> I wonder if someone could explain the damage mechanism? As I see it
> a single roller, or suspended tow is not a lot different to the
> situation where one pair of wheels on the same axle are spinning in
> mud and the others are stationary. (without the centre diff locked).
> Surely this is not going to damage things?
>


However, the initial question was about applying the handbrake while on
the roller. A very good question indeed when one reads the driver
manual of def's specifying that one should not apply the handbrake
before the car is stationary.

Fred
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Old 06-14-2005, 00:35   #5 (permalink)
Austin Shackles
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Re: Can MOT testing damage transfer Box?

On or around Fri, 10 Jun 2005 12:39:00 +0100, "Jeff" <jeff@local.host>
enlightened us thusly:

>> "A single axle roller rig may be used for speeds up to 5km/h. The centre
>> differential lock must be disengaged. For roller tests over 5km/h, either
>> all four wheels must be rotated at the same speed or if only a single axle
>> roller rig is available, the centre differential must be locked and the
>> propeller shaft to the stationary axle must be removed."
>> Was it a 4x4 specialist garage?
>> Hope this helps.
>>

>
>There are similar warnings about suspended towing;
>
>I wonder if someone could explain the damage mechanism? As I see it a
>single roller, or suspended tow is not a lot different to the situation
>where one pair of wheels on the same axle are spinning in mud and the others
>are stationary. (without the centre diff locked). Surely this is not going
>to damage things?


depends. You don't spin the wheels at e.g. 40 mph for extended periods. In
other words, the speed difference across the diff is not very large and is
only maintained for a short period.


--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
Beyond the horizon of the place we lived when we were young / In a world
of magnets and miracles / Our thoughts strayed constantly and without
boundary / The ringing of the Division bell had begun. Pink Floyd (1994)
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Old 06-14-2005, 00:35   #6 (permalink)
Wolverine
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Re: Can MOT testing damage transfer Box?

God! I forgot about that one. Did it by accident once whilst pulling into
the drive. The steering wheel still has the impression of my teeth in it!!
:)
Wolverine
Big Red 110CSW

"Fred Labrosse" <ffl@aber.ac.uk> wrote in message
news:20050610134058.78b121dd@localhost...
> On Fri, 10 Jun 2005 12:39:00 +0100
> "Jeff" <jeff@local.host> wrote:
>
>> > "A single axle roller rig may be used for speeds up to 5km/h. The
>> > centre differential lock must be disengaged. For roller tests over
>> > 5km/h, either all four wheels must be rotated at the same speed or
>> > if only a single axle roller rig is available, the centre
>> > differential must be locked and the propeller shaft to the
>> > stationary axle must be removed." Was it a 4x4 specialist garage?
>> > Hope this helps.
>> >

>>
>> There are similar warnings about suspended towing;
>>
>> I wonder if someone could explain the damage mechanism? As I see it
>> a single roller, or suspended tow is not a lot different to the
>> situation where one pair of wheels on the same axle are spinning in
>> mud and the others are stationary. (without the centre diff locked).
>> Surely this is not going to damage things?
>>

>
> However, the initial question was about applying the handbrake while on
> the roller. A very good question indeed when one reads the driver
> manual of def's specifying that one should not apply the handbrake
> before the car is stationary.
>
> Fred



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Old 06-14-2005, 00:35   #7 (permalink)
beamendsltd
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Posts: n/a
Re: Can MOT testing damage transfer Box?

In message <42a95f89$0$1735$ed2e19e4@ptn-nntp-reader04.plus.net>
"Dunga" <test@test.com> wrote:

> Just fitted new brake shoes to my 1985, 110, it went for retest at MOT
> station and they failed again on the handbrake, now the transfer box oil
> seal is knackered and brake shoes are contaminated with oil from transfer
> box.
>
> My question is, what sort of damage could the MOT station do by applying the
> handbrake while on the rolling road?
>
>


I'm absolutely not casting any aspertions on the MOT tester's abilities,
but yanking the handbrake on when on the rolling road (as most do
fro the MOT) can buckle the brake back plate. I'm saying no more....

Richard
--
www.beamends-lrspares.co.uk sales@beamends-lrspares.co.uk
Running a business in a Microsoft free environment - it can be done
Powered by Risc-OS - you won't get a virus from us!!
Helping keep Land Rovers on and off the road to annoy the Lib Dems
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Old 06-14-2005, 00:35   #8 (permalink)
beamendsltd
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Posts: n/a
Re: Can MOT testing damage transfer Box?

In message <d8bu4k$j4r$1@news6.svr.pol.co.uk>
"Jeff" <jeff@local.host> wrote:

> > "A single axle roller rig may be used for speeds up to 5km/h. The centre
> > differential lock must be disengaged. For roller tests over 5km/h, either
> > all four wheels must be rotated at the same speed or if only a single axle
> > roller rig is available, the centre differential must be locked and the
> > propeller shaft to the stationary axle must be removed."
> > Was it a 4x4 specialist garage?
> > Hope this helps.
> >

>
> There are similar warnings about suspended towing;
>
> I wonder if someone could explain the damage mechanism? As I see it a
> single roller, or suspended tow is not a lot different to the situation
> where one pair of wheels on the same axle are spinning in mud and the others
> are stationary. (without the centre diff locked). Surely this is not going
> to damage things?
>
> Regards
> Jeff
>
>


Someone who knows how diffs *really* work once expplained to me why
the two wheels driving the diff is not the same the diff driving the
two wheels. But it was a while ago, when our 7.5 tonner needed a tow
after it broke down and the recovery block took the rear prop off,
which was apparently the correct thing to do.

Richard
--
www.beamends-lrspares.co.uk sales@beamends-lrspares.co.uk
Running a business in a Microsoft free environment - it can be done
Powered by Risc-OS - you won't get a virus from us!!
Helping keep Land Rovers on and off the road to annoy the Lib Dems
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Old 06-14-2005, 00:35   #9 (permalink)
Dunga
Guest
 
Posts: n/a
Re: Can MOT testing damage transfer Box?

"beamendsltd" <beamendsltd@btconnect.com> wrote in message
news:23d1d8784d%beamendsltd@btconnect.com...
> In message <42a95f89$0$1735$ed2e19e4@ptn-nntp-reader04.plus.net>
> "Dunga" <test@test.com> wrote:
>
>> Just fitted new brake shoes to my 1985, 110, it went for retest at MOT
>> station and they failed again on the handbrake, now the transfer box oil
>> seal is knackered and brake shoes are contaminated with oil from transfer
>> box.
>>
>> My question is, what sort of damage could the MOT station do by applying
>> the
>> handbrake while on the rolling road?
>>
>>

>
> I'm absolutely not casting any aspertions on the MOT tester's abilities,
> but yanking the handbrake on when on the rolling road (as most do
> fro the MOT) can buckle the brake back plate. I'm saying no more....
>
> Richard
> --
> www.beamends-lrspares.co.uk sales@beamends-lrspares.co.uk
> Running a business in a Microsoft free environment - it can be done
> Powered by Risc-OS - you won't get a virus from us!!
> Helping keep Land Rovers on and off the road to annoy the Lib Dems


Richard

Is this likely to cause the problems that I have 'transfer box oil seal
failure and therefore oil contaminated brake shoes"?

Regards


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Old 06-14-2005, 00:35   #10 (permalink)
Marc Draper
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Posts: n/a
Re: Can MOT testing damage transfer Box?

In message <42a95f89$0$1735$ed2e19e4@ptn-nntp-reader04.plus.net>, Dunga
<test@test.com> writes
>Just fitted new brake shoes to my 1985, 110, it went for retest at MOT
>station and they failed again on the handbrake, now the transfer box oil
>seal is knackered and brake shoes are contaminated with oil from transfer
>box.
>
>My question is, what sort of damage could the MOT station do by applying the
>handbrake while on the rolling road?
>
>



It is the wrong procedure to test a Landrover handbrake on a rolling
road. Due to possible damage to brake backplate and prop UJs.

The act of having two wheels on the brake testrer. spinning with the
others are stationary will do NO damage at all to the transfer box.

If you were underpower on a Dyno then a two wheel rolling road would
damage the diff in the transfer box.

When under load on a two wheel rolling road the diff is having to pass
all the power via the planet gears. These have no real bearings so to
speak and soon die.

This is why if you get stuck and sit spinning your wheels you will
knacker your axle diffs over time.

--
Marc Draper
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