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Topic: castors out of specification (Read 331 times) |
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Butterfingers
Full Member
2.3, 16V auto R Reg Ultima
Posts: 202
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castors out of specification
« on: Jul 3rd, 2006, 12:45pm » |
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Had a geometry check carried out by a FMD and it showed the front castors to be slightly off manufacturers specification by 0.6 degrees.
What does this mean and is it something to worry about?
Thanks.
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martin_rowe
Full Member
I love YaBB 1G - SP1!
Posts: 879
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Re: castors out of specification
« Reply #1 on: Jul 3rd, 2006, 1:00pm » |
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About the only thing that can effect the geometry is worn / sagged springs as its all fixed on the scorp, unless thers been an accident. did you ask what would rectify this fault.
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mr._floppy
Junior Member
Posts: 100
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Re: castors out of specification
« Reply #2 on: Jul 3rd, 2006, 1:18pm » |
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I got mine done recently too, the limits for the camber are between 4 deg. 12'
and 5 deg. 40', mine were 3 deg. 30', out , but not by much. the guy says
nowt to worry about as at least both sides are out by an equal amount so
there should be no steering pull, and anyway it's non adjustable unless
you want to re-position and re-weld the engine bay suspension tower
mountings.
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: castors out of specification
« Reply #3 on: Jul 3rd, 2006, 8:34pm » |
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hi there
sounds like the wishbone ball joint is worn. 
seen it before with mine. tried replacing the bushes only, but that's a complete waste of time, imho, as every part has done the same mileage, etc.
others might have a different view, though.
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howiedintheplace
Senior Member
Based near Evesham
Posts: 1194
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Re: castors out of specification
« Reply #4 on: Jul 3rd, 2006, 8:46pm » |
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Castor angle is the angle of the strut relative to the car from front to back.
It's this angle that lets your car steering wheel self centre & affects turn in speed on a corner.
If both these are O.K I would not worry.
Strut top mounting & lower arm will affect it.
But if you mess with these parts it will alter your camber & tracking also.
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Dave
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Butterfingers
Full Member
2.3, 16V auto R Reg Ultima
Posts: 202
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Re: castors out of specification
« Reply #5 on: Jul 3rd, 2006, 9:10pm » |
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Thanks, does this explain why my steering wheel maybe off centre?
Thanks.
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Snoopy
Administrator
Very old.BAD tempered and missing friends.
Posts: 6278
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Re: castors out of specification
« Reply #6 on: Jul 3rd, 2006, 9:44pm » |
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NO not necessarilly.. Having the tracking done can put the steering wheel off centre .. There is a procedure for re-centering it. Steering_wheel
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howiedintheplace
Senior Member
Based near Evesham
Posts: 1194
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Re: castors out of specification
« Reply #7 on: Jul 3rd, 2006, 10:29pm » |
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No the fact your steering is not straight is down to poor tracking adjustment by someone.
What I mean is when you let go of the wheel the car goes straight & will straighten up by itself.
That is what the castor angle does, if no castor angle the car would carry on at what ever position the steering wheel was at.
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Dave
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Snoopy
Administrator
Very old.BAD tempered and missing friends.
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Re: castors out of specification
« Reply #8 on: Jul 4th, 2006, 7:31am » |
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Dave is quite correct in what he states. If you need to understand what castor angle is and what it does it is explained on this page HERE
To demonstrate the effect of castor angle If you put the car in reverse and put full lock on the car will continue to go around in a circle due to the effect of reverse castor the castor angle is MOST pronounced on the forks of bicyles , its the amount the forks lean forward from the vertical.
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