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        General >> Problems >> rear tyre problem 
        
(Message started by: bootiful-scorpios on Sep 11th, 2006, 2:01pm)
Title: rear tyre problem
Post by bootiful-scorpios on Sep 11th, 2006, 2:01pm
noticed that the rear tyres are wearing out on the inside
is this a normal scorp issue?

did have to have 2 new tyres on frount as they had worn out on the inside but they said the tracking was out quite a lot so had that done along with 4 wheel aliment etc at that time the back tyres were still very good and it wernt 2 many weeks ago .
Title: Re: rear tyre problem
Post by Waglet on Sep 11th, 2006, 6:52pm
Imperative to keep the tyre pressures right. I read through the forums a week or so ago and someone recommends 31 rear 28 front. Yours have not been over inflated have they?
Wag
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 11th, 2006, 7:44pm
possible been putting in 31 all round
Title: Re: rear tyre problem
Post by Highlander on Sep 11th, 2006, 8:36pm
Inner bushes on the rear suspension can cause this too

Bush 8 on the diagram

http://www.fordscorpio.co.uk/images/rearsuspension96on.gif
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 11th, 2006, 9:27pm
& also if you carry heavy loads alot, tow alot or if the rear springs have aged & the ride height is too low.
Under inflation will wear both outside, over inflation just the middle.

If both tyres are the same, it points to ride height to low ;)
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 11th, 2006, 9:31pm
thanks highlander. noticed that the black casing around the rear spring (looks like a dounut)has a split in it could that be any thing to do with it?
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 11th, 2006, 9:36pm

on 09/11/06 at 21:27:45, howiedintheplace wrote:
& also if you carry heavy loads alot, tow alot or if the rear springs have aged & the ride height is too low.
Under inflation will wear both outside, over inflation just the middle.

If both tyres are the same, it points to ride height to low ;)


yes both are the same the inside worn! ,springs then .how much are they each or a pair ?  

dont carry heavy loads or do towing
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 11th, 2006, 9:38pm
You mean the spring seat or cushion.

Depends the seat is meant to form a acoustic cushion but also creates about a inch gap between the spring & the body so if that gap is not there your car sits about a inch lower & would wear the innner tread of the tyres.
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 11th, 2006, 9:46pm
it do look a little low ,  if its lower than it should be would it throw out the camber angle of the tyres
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 11th, 2006, 10:05pm
Yeah that's it.

Measure the distance between the top of the arch & the centre of the wheel on flat ground then compare it to others on here.
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 11th, 2006, 10:44pm
ok will do tomorrow and let you know  ;)
Title: Re: rear tyre problem
Post by mr._floppy on Sep 12th, 2006, 10:02am
I  can't see  the  rear  ride  height   ( a  figure    Ford   keep  to  themselves ,  a  indication of its  importance )   being   too low  by an  inch   causing  recognisable   uneven tyre wear.
                             
                      The   trailing arm   system  on  the  rear  doesn't  produce  serious  Negative  camber   when   overloaded   or  when   the  springs  are droopy.  ( Rear spring  replacement  is  a major  job  judging by the  information of this site ).

              Rear  Bearing  or  trailing arm   Bush  wear  is  a possibility
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 12th, 2006, 12:10pm
Ride height is very important for cars fitted with this type of rear suspension.

Thousands of Sierra & granada owners will know only to well.

As the car gets lower the top of the tyre goes in creating the camber problems.

On the rear of my car I have made the rear suspension adjustable for camber, toe, track, ride height & wheelbase ;D



Yes bushes can cause it but if the car looks low it's usally camber.
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 12th, 2006, 4:44pm
got the tape out, and from top of arch to middle of wheel it measured 13 inches what should it be ?
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 12th, 2006, 6:52pm
More than that, some kind soul needs to measure their car to see what a known good one should be.

A Scorpio wheel is about 2 foot across so your saying you only have a inch clearence between the top of the wheel & the arch?
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 12th, 2006, 7:06pm
yes its only a inch clearence.  would any body happen to know what its ment to be?  
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 14th, 2006, 3:55pm
?
Title: Re: rear tyre problem
Post by Tompion on Sep 14th, 2006, 5:36pm
Don't know what it should be, but my 2.3 measures the same as yours, I run the same pressures as you, I'm getting fairly even wear on all tyres (my front tyres were wearing on the sides before upping the pressures).

Dave
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 14th, 2006, 5:50pm
hi dave thanks for reply , did your frount tyres wear on the inside ? like ours did ,
Title: Re: rear tyre problem
Post by Tompion on Sep 14th, 2006, 5:57pm
Hi

The fronts were wearing inside & out ie typical low pressure wear.

Dave
Title: Re: rear tyre problem
Post by TiberiuS on Sep 14th, 2006, 6:51pm
Well, I've got about 14" on my 2.3, no tyre wear/suspension problems. The car sits down low when loaded so I don't think an inch or two would make much difference :). As for tyre pressures, I still use ones written in the manual, 29 front, 26 rear, no problems yet.

Hope this helps, Bruce.
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 14th, 2006, 7:13pm
bruce what size are your tyres and rims ?  225/50/16?
Title: Re: rear tyre problem
Post by TiberiuS on Sep 14th, 2006, 7:21pm
Yup, standard Ultima trim ;)
Title: Re: rear tyre problem
Post by bootiful-scorpios on Sep 14th, 2006, 8:38pm
have any one else had tyres cutting up on the inside at the rear ? need to find cure before b4 buying new tyres .
Title: Re: rear tyre problem
Post by mr._floppy on Sep 15th, 2006, 12:48am
If the rear wheels  have undue  negative camber it will be obvious when looking from the rear of the car.


                        The  wheels will  tilt   in  at  the  top,  when stationary.

  However,   if that proves to  be   OK  then  the   rear   toe-in/out      could   be suspect .
                      Best to get a  full  wheel  alignment/geometry    check.
Title: Re: rear tyre problem
Post by tommy1340millar on Sep 15th, 2006, 10:11am
my 2 rears wore right through on the inside (looked like new on the outer edge)

I tend to run my estate quite laden, but thought I had left all this behind with the lowered sapphire.

looking from the window here, I appear to have about 2" rear arch clearance, very slightly less than appears at the front .

I didn't really want to get into shimming the rears - it took about 3 goes to get the sapph better, and it STILL wears the inside of the rear tyres.

Bottom line for me - it's cheaper to replace rear tyres than pay £285 a pop for self levelling rear shocks, (even though I don't quite understand how they work, I was under the impression that the spring rate/length would set the car height)
Title: Re: rear tyre problem
Post by kev2scorps on Sep 15th, 2006, 10:21am
my 95 2.0L Scorp has a low ride height at the rear also.  Replaced rear springs with spurious ones, as I could not get Ford ones.  Ride height did not change! :-[ Wheel arch is still only 1/2 - 1 " above the tyre! This car runs on 205 60 15 Bridgestones, but does not appear to suffer from uneven wear.  I have considered raising the rear with spring spacers, but have not been able to locate suitable ones so far.
Perhaps the wider tyres, 225 50 16, are more prone to uneven wear if everything is not as it should be with the rear suspension / ride height.
Kev.
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 15th, 2006, 10:28am
O.k this is not really working.

Camber or the road height of the car is dependent on if the car is on flat ground, car has to be at it's correct unladed weight & everything suspension related is STD.

Perhaps you should find a proper garage that can measure rear suspension angles.
Then you will know if it's camber or toe.

If a inner/outer arm bush has gone then it will cause inner tyre wear on that tyre (toe related)

But as you say both rear tyres are wearing it sounds like ride height which affects camber on both wheels.

You say you had it 4 wheel aligned but they don't actually check the backs, they use the rear wheels only to help align the fronts for toe only, so is not probably as good as you think ;)
Title: Re: rear tyre problem
Post by howiedintheplace on Sep 15th, 2006, 10:37am

Also this all depends on how often you have a laden car etc.
If the car is a little low to start with then:

If it's just you most of the time then a low ride height will not really show in tyre wear but if you tow alot, carry heavy loads alot or have a car full of people all the time it will show up in tyre wear.

My Dad use to tow alot with a old Granada estate, it went through new rears in a year.
We rose the rear height by 3 inches & it stopped the wear.


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