Tuesday, Nov 02, 2021 at 12:58
G'day Glenn.
A 4 wheel alignment is the alignment of 4 wheels, ie, one at each corner not necessarily the same as a normal alignment done on the front two wheels via it's
suspension adjustments.
What vehicle do you have needing 4 wheels aligned?
In what way was the vehicle worse than before/ What does it do which you are concerned about.
If a rear solid axle vehicle then there is nothing to align apart from ensuring rubber bushings are proper and not stuffed.
That leaves the front. and it will have camber and caster adjustments plus toe in/out as specs require.
Not sure how handy you are, but I have a couple of small digital levels which show the angle they are placed at. It is quite easy to check Camber of each wheel face and compare each side reading, usually near vertical but sometimes set by manufacturers slightly negative , ie, inward at top or slightly out at the top.
Finding a machined flat area square to the steering axis of front
suspension allows instant caster reading by placing the small digital gauge on the flat while steering straight ahead.
Toe in/out requires a laser level on face of tyre to point 1m ahead and behind wheel, mark the spots and do other side. Measure the across the front points and rear points at floor to find if it is toe in or out and any relative distance to specs.
A vehicle ALWAYS pulls to the side of LEAST positive caster, ie, the lean back of steering angle, governed by the line through the ball joints. They should be pretty even and within 0.2 of a degree.
Preference slightly less on RHS to fight road camber.
A solid front axle same applies but adjustments are more difficult because of camber and caster are not ok then physical shims or other adjustments are required.
Most mechanics do not understand much about wheel alignment. Often at aligning
places the gorilla doing the alignment isn't even a mechanic.
While physical effort is required it isn't hard to achieve and most times a fancy multi thousand $ machine is not an advantage.
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