Steering Alignment

Today saw me fit the steer­ing rack to the mount­ing points on the chassis.    GD sup­plies the rack with split poly­ureth­ane bushes which which just pop straight on and are then bolted down using a couple of pack­ing wash­ers.   The track rod ends are screwed on and inser­ted into the sup­plied steer­ing arms.  Once the rack was fit­ted it needed to be centred.

Cent­ring of the rack is achieved by mark­ing the input shaft and using mask­ing tape mark­ing a datum point on the steer­ing rack.   Count­ing the num­ber of turns from full right lock, mark­ing and then return­ing to full left lock and again mark­ing it.   Finally, turn the rack back to 12 the num­ber of turns between the two marks.

Next was to set the “toe in” by clamp­ing a 1m piece of angle to each disc face and meas­ur­ing both front and rear then sub­tract­ing the rear meas­ure­ment from the front which provides the “toe in/out” cal­cu­la­tion.

The Gard­ner Douglas manu­al recom­mends 0.0mm to 1.5mm “toe in” max­im­um which is achieved by wind­ing the track rods in (or out) until the required meas­ure­ment is obtained.

Hav­ing achieved the the cor­rect “toe in”, it was time to val­id­ate the align­ment of the wheels using the 1m angle clamped to the centreline of the chassis (as marked when set­ting the rear axle).   With the laser level clamped to the disc I marked the red dot on the angle, then repeated it on the oth­er side. I then meas­ured the dis­tance between the two marked points and marked the centre of that on the angle. I then moved the angle so the centrelines on the angle and the chassis cor­res­pon­ded and adjus­ted the track rods until the laser came back to the marks made on the angle. Now we have all wheels point­ing in the right dir­ec­tion.

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