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Author Topic: Castor angle  (Read 2233 times)

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megaomega123

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Castor angle
« on: 17 March 2010, 20:01:39 »
How is the castor angle adjusted on the omega?
Why would the castor be so far out of tolerance on one side?
Is castor easily rectified?
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markfree

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Re: Castor angle
« Reply #1 on: 17 March 2010, 20:12:47 »
Castor is factory set and is not adjustable.
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megaomega123

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Re: Castor angle
« Reply #2 on: 17 March 2010, 20:17:37 »
Quote
Castor is factory set and is not adjustable.
So what are the factory settings? My passenger front looked off the scale but driver side was ok, is this setting correct?
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Entwood

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Re: Castor angle
« Reply #3 on: 17 March 2010, 20:21:03 »
A common reason for castor angles to be wrong is wishbone bush wear.

Have you had your wishbones checked recently ?? If not that's the first thing I'd check.

Also .. if they have been changed recently . and they were torqued up WITHOUT the weight being on the suspension .. that could lead to some odd angles as the whole bush set up will be under severe strain .. :(
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Kevin Wood

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Re: Castor angle
« Reply #4 on: 17 March 2010, 20:22:40 »
ISTR it can be adjusted slightly be repositioning the subframe.

If it's miles out I would suggest something might be bent perhaps?

Kevin
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Old Fella

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Re: Castor angle
« Reply #5 on: 17 March 2010, 20:30:11 »
Surely moving the front sub-frame on its mounting bolts will alter the caster angle, albeit minimally.
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markfree

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Re: Castor angle
« Reply #6 on: 17 March 2010, 20:41:14 »
Quote
Quote
Castor is factory set and is not adjustable.
So what are the factory settings? My passenger front looked off the scale but driver side was ok, is this setting correct?

Caster should be between 4 degrees 40 mins and 6 degrees 40 mins both sides according to the print-out I received when I last had wheel alignment done - Haynes states 5 degrees 40 min with max deviation 1 degree - don't know if these are factory settings - these are for saloon by the way - estate 5 degrees with dev of 1 degree:y
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markfree

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Re: Castor angle
« Reply #7 on: 17 March 2010, 20:52:58 »
Quote
Surely moving the front sub-frame on its mounting bolts will alter the caster angle, albeit minimally.

"Most modern cars only have adjustments for toe. Caster and camber went the way of the dodo thanks to the McPherson strut".
Above is a quote from a reputable web-site; not quite true in respect of miggy as you can adjust camber by moving strut in or out  :y
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megaomega123

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Re: Castor angle
« Reply #8 on: 17 March 2010, 21:38:20 »
Quote
ISTR it can be adjusted slightly be repositioning the subframe.

If it's miles out I would suggest something might be bent perhaps?

Kevin
It had a knock 2 years ago and has never been right since. It has been eating the inside edge of drivers side front tyre. I suspected camber and was right. I had all the alignment done 2 weeks ago and I dont think it has been done well, even though I was present throughout. All they did was heat the TRE's to within an inch of their lives, swear at it and tell me what a sh!t design it was.
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Seth

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Re: Castor angle
« Reply #9 on: 17 March 2010, 21:45:07 »
Quote
Quote
ISTR it can be adjusted slightly be repositioning the subframe.

If it's miles out I would suggest something might be bent perhaps?

Kevin
It had a knock 2 years ago and has never been right since. It has been eating the inside edge of drivers side front tyre. I suspected camber and was right. I had all the alignment done 2 weeks ago and I dont think it has been done well, even though I was present throughout. All they did was heat the TRE's to within an inch of their lives, swear at it and tell me what a sh!t design it was.

The track rod ends have nothing to do with camber or castor-angle settings.
Camber is set by repositioning the Macpherson strut relative to the hub-carrier assembly.
 ;)
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megaomega123

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Re: Castor angle
« Reply #10 on: 17 March 2010, 21:47:17 »
Quote
Quote
Quote
ISTR it can be adjusted slightly be repositioning the subframe.

If it's miles out I would suggest something might be bent perhaps?

Kevin
It had a knock 2 years ago and has never been right since. It has been eating the inside edge of drivers side front tyre. I suspected camber and was right. I had all the alignment done 2 weeks ago and I dont think it has been done well, even though I was present throughout. All they did was heat the TRE's to within an inch of their lives, swear at it and tell me what a sh!t design it was.

The track rod ends have nothing to do with camber or castor-angle settings.
Camber is set by repositioning the Macpherson strut relative to the hub-carrier assembly.
 ;)
I understand that. They did the camber pretty quickly. I was just making the point of how bad they were whilst doing the TRE's :y It still pulls to the left and the steering wheel isn't central
« Last Edit: 17 March 2010, 21:49:14 by phate321 »
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Martin_1962

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Re: Castor angle
« Reply #11 on: 17 March 2010, 22:01:38 »
A long trip but try WIM
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Seth

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Re: Castor angle
« Reply #12 on: 17 March 2010, 22:07:04 »
Quote
A long trip but try WIM
Absolutely  :y :y :y
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megaomega123

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Re: Castor angle
« Reply #13 on: 17 March 2010, 22:10:15 »
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A long trip but try WIM
It is a bit too far at the moment but it was reading their website that made me question the setup that I had done. I will just take it back and get what I paid for for the time being.
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guncharmer

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Re: Castor angle
« Reply #14 on: 17 March 2010, 22:11:43 »
What is it you are looking at that seems off the scale?
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