Thread: Disco 4 pulls to left when not corrected

Maybe a tight wheel bearing or worn suspension bushes. Could also be in the front transfer case. Good luck finding the cause.

Radial pull.
I reckon tyres.

Ron

Originally Posted by RHS58

Radial pull.
I reckon tyres.

Ron

Hadn't even considered radial pull, Thanks for the idea. Would this consistently manifest itself even when the tyres have been rotated?

85k - lower control arm bushes - all aligns fine in ttm but once back to onroad self levelling it's getting a little loose.
Generally wheel alignment settings are designed to drift the car to the passenger side of the road - so if you do decide a nanna nap is in order you are more likely to drive off onto the shoulder than into oncoming traffic.

Originally Posted by jonrichkl

Hadn't even considered radial pull, Thanks for the idea. Would this consistently manifest itself even when the tyres have been rotated?

Had this on the Prado.
3 out of 4 rotations pulled left, 4th perfect.

Do you have a recent wheel alignment data sheet ? The positive castor on the lh side should be about a 1/4 degree higher, to compensate for the camber of the road. The camber on each side should be pretty much the same. If it is different, it is preferable to have the rh side more positive. ( but there should not be a big difference regardless )
The rear toe can also influence the way the vehicle drives. It should be even both sides.
Tyres can be an influencing factor, but this normally something that arises when tyres are changed. ie. If you have recently changed the tyres or rotated them, and the vehicle now pulls one way or the other, ( and it didn't previously & the wheel alignment is technically correct ) try changing them around on the front end. If there is a pull to the left or right, and this reverses when they are swapped, you will have to look at changing the tyres, or putting them on the rear.
In my experience, most 3/4 Disco's ( and Rangies/Evoques ) even when setup with a technically correct alignment, will draw ever so slightly to the left. If your vehicle has always had the issue, despite tyre rotation, different tyres, and multiple wheel alignments, and you are satisfied they have been completing the alignments correctly, I would start looking at other factors.

I am not familiar with the internal workings of the steering rack used on the D3/4,but most power steer racks, have an internal torsion bar, and a power valve. If the torsion bar is bent ( normally takes an impact ) or the power valve is out of calibration, the vehicle steering can react as if dead centre is off centre. However, this is normally evident all the time. If you come to a stop, and let the steering go, and it shifts off centre by itself, I would investigate the rack. Sorry I don't know enough about the D3/4 rack to advise further.

Originally Posted by ADMIRAL

Do you have a recent wheel alignment data sheet ? The positive castor on the lh side should be about a 1/4 degree higher, to compensate for the camber of the road. The camber on each side should be pretty much the same. If it is different, it is preferable to have the rh side more positive. ( but there should not be a big difference regardless )
The rear toe can also influence the way the vehicle drives. It should be even both sides.
Tyres can be an influencing factor, but this normally something that arises when tyres are changed. ie. If you have recently changed the tyres or rotated them, and the vehicle now pulls one way or the other, ( and it didn't previously & the wheel alignment is technically correct ) try changing them around on the front end. If there is a pull to the left or right, and this reverses when they are swapped, you will have to look at changing the tyres, or putting them on the rear.
In my experience, most 3/4 Disco's ( and Rangies/Evoques ) even when setup with a technically correct alignment, will draw ever so slightly to the left. If your vehicle has always had the issue, despite tyre rotation, different tyres, and multiple wheel alignments, and you are satisfied they have been completing the alignments correctly, I would start looking at other factors.

I am not familiar with the internal workings of the steering rack used on the D3/4,but most power steer racks, have an internal torsion bar, and a power valve. If the torsion bar is bent ( normally takes an impact ) or the power valve is out of calibration, the vehicle steering can react as if dead centre is off centre. However, this is normally evident all the time. If you come to a stop, and let the steering go, and it shifts off centre by itself, I would investigate the rack. Sorry I don't know enough about the D3/4 rack to advise further.

You is relying on us grader steerers getting the camber correct on the road
Andrew

Originally Posted by ADMIRAL

In my experience, most 3/4 Disco's ( and Rangies/Evoques ) even when setup with a technically correct alignment, will draw ever so slightly to the left.

Mine does that after the last wheel alignment I had done. There was no problem before that but I had clipped a gutter and split the nearside rear tyre so I thought I had better get an alignment done. It was done at the place the dealer uses after I had a service and when I mentioned it at the next service they suggested that it could require another alignment. It's not severe but I now notice a very slight pull to the left that wasn't there before the alignment. Tyre wear is normal so that's not a problem so I have left it for the moment.

Martin