Tracking

J

John Woodison

Guest

• Sep 21, 2006

• #1

The handbbok for my Disco gives a toe-out tolerance measurement from 1.2 to
2.44mm.
I am quite happy working in degrees and minutes, but have no idea where I
should be
taking the above measurement from.
Could some kind person explain it to me, or direct me to a web page that
does.

Thanks,
John

 

J

JD

Guest

• Sep 21, 2006

• #2

John Woodison wrote:

> The handbbok for my Disco gives a toe-out tolerance measurement from 1.2
> to 2.44mm.
> I am quite happy working in degrees and minutes, but have no idea where I
> should be
> taking the above measurement from.
> Could some kind person explain it to me, or direct me to a web page that
> does.
>
> Thanks,
> John

Measurement is the difference between the track measured at the front and
back of the front wheel on the tyre tread. The easiest way to do it is to
jack up the front, spin each wheel holding a fine piece of chalk against
the tread to give a line to measure from, then measure at the front and
back of the wheels (preferably after putting weight back on the wheels) -
easier if you make up a rod or pole with two point sticking out from it,
one adjustable.
JD

 

J

John Woodison

Guest

• Sep 21, 2006

• #3

Thank you.



"JD" <[email protected]> wrote in message
news:[email protected]...
> John Woodison wrote:
>
>> The handbbok for my Disco gives a toe-out tolerance measurement from 1.2
>> to 2.44mm.
>> I am quite happy working in degrees and minutes, but have no idea where I
>> should be
>> taking the above measurement from.
>> Could some kind person explain it to me, or direct me to a web page that
>> does.
>>
>> Thanks,
>> John
>
> Measurement is the difference between the track measured at the front and
> back of the front wheel on the tyre tread. The easiest way to do it is to
> jack up the front, spin each wheel holding a fine piece of chalk against
> the tread to give a line to measure from, then measure at the front and
> back of the wheels (preferably after putting weight back on the wheels) -
> easier if you make up a rod or pole with two point sticking out from it,
> one adjustable.
> JD

 

D

Dougal

Guest

• Sep 21, 2006

• #4

JD wrote:
> John Woodison wrote:
>
>
>>The handbbok for my Disco gives a toe-out tolerance measurement from 1.2
>>to 2.44mm.
>>I am quite happy working in degrees and minutes, but have no idea where I
>>should be
>>taking the above measurement from.
>>Could some kind person explain it to me, or direct me to a web page that
>>does.
>>
>>Thanks,
>> John
>
>
> Measurement is the difference between the track measured at the front and
> back of the front wheel on the tyre tread. The easiest way to do it is to
> jack up the front, spin each wheel holding a fine piece of chalk against
> the tread to give a line to measure from, then measure at the front and
> back of the wheels (preferably after putting weight back on the wheels) -
> easier if you make up a rod or pole with two point sticking out from it,
> one adjustable.
> JD

What you are trying to measure is illustrated here:
http://www.landrover.ee/est/files/manuals/cars/rrc/rrm_steering.pdf
(last page)

I just use the closest points on the insides of the tyres at axle
height to avoid problems with damaged rims.

A simple extending rod is all that is needed (or fixed length and
something to measure short extensions therefrom) - you may need to
have the ends 'bent up' to get round roll bars etc..

Don't get hung up by what you're doing - all that you are measuring is
the difference in the defined length at the back and front of the
wheels. Make your bar to fit to the rear of the wheels, move to the
front and check the gap. The difference (your 1.2 to 2.4 mm) is wide
enough to be gauged visually.

 

A

Austin Shackles

Guest

• Sep 22, 2006

• #5

On or around Fri, 22 Sep 2006 07:32:19 +1000, JD <[email protected]>
enlightened us thusly:

>John Woodison wrote:
>
>> The handbbok for my Disco gives a toe-out tolerance measurement from 1.2
>> to 2.44mm.
>> I am quite happy working in degrees and minutes, but have no idea where I
>> should be
>> taking the above measurement from.
>> Could some kind person explain it to me, or direct me to a web page that
>> does.
>>
>> Thanks,
>> John
>
>Measurement is the difference between the track measured at the front and
>back of the front wheel on the tyre tread. The easiest way to do it is to
>jack up the front, spin each wheel holding a fine piece of chalk against
>the tread to give a line to measure from, then measure at the front and
>back of the wheels (preferably after putting weight back on the wheels) -
>easier if you make up a rod or pole with two point sticking out from it,
>one adjustable.

in practical terms, it's most often measured on the wheel rims. Generally
find parallel works well on LRs, but I don't know if that's still true on
recent ones (disco III etc).

which reminds me, must tweak Edward's tracking a tad - it feels a bit toed
out. that and adjust the brakes.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Where they make a desert they call it peace" Tacitus (c.55 - c.117)
Agricola, 30

 

J

John Woodison

Guest

• Sep 22, 2006

• #6

"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around Fri, 22 Sep 2006 07:32:19 +1000, JD <[email protected]>
> enlightened us thusly:
>
>>John Woodison wrote:
>>
>>> The handbbok for my Disco gives a toe-out tolerance measurement from 1.2
>>> to 2.44mm.
>>> I am quite happy working in degrees and minutes, but have no idea where
>>> I
>>> should be
>>> taking the above measurement from.
>>> Could some kind person explain it to me, or direct me to a web page that
>>> does.
>>>
>>> Thanks,
>>> John
>>
>>Measurement is the difference between the track measured at the front and
>>back of the front wheel on the tyre tread. The easiest way to do it is to
>>jack up the front, spin each wheel holding a fine piece of chalk against
>>the tread to give a line to measure from, then measure at the front and
>>back of the wheels (preferably after putting weight back on the wheels) -
>>easier if you make up a rod or pole with two point sticking out from it,
>>one adjustable.
>
> in practical terms, it's most often measured on the wheel rims. Generally
> find parallel works well on LRs, but I don't know if that's still true on
> recent ones (disco III etc).
>
> which reminds me, must tweak Edward's tracking a tad - it feels a bit toed
> out. that and adjust the brakes.
> --
> Austin Shackles. www.ddol-las.net my opinions are just that
> "Where they make a desert they call it peace" Tacitus (c.55 - c.117)
> Agricola, 30






Thanks to all, have now made a gauge out of wood and a wire coathanger,
just waiting for the rain to stop now.

John

 

T

TonyB

Guest

• Sep 22, 2006

• #7

Which Disco?
My 300 Tdi is supposed to be parallel.
The 200 Tdi was said to be 1-2mm toe out.
TonyB

 

R

Richard Brookman

Guest

• Sep 22, 2006

• #8

Dougal wrote:

|| I just use the closest points on the insides of the tyres at axle
|| height to avoid problems with damaged rims.

Funny that, I always use the insides of the rims (assuming undamaged) to
avoid problems with variations in the tyre wall! In practice, the
difference (radial distance from the hub) is insignificant - what is more
important is to use the same fixed point in all four locations you measure
(left/right, front/rear of wheel).

Don't forget to roll the vehicle forwards a few feet before you measure so
that play in the balljoints etc is taken up, and make sure the wheels are
pointing dead ahead - if they are to left or right, Mr Ackermann will make
sure your measurements are in vain.

--
Rich
==============================

Take out the obvious to email me.