OK, will do.
I bought the car with the front driver side tyre bald on the outside only, which was indicating some kind of tracking problem. And also the car had a wheel wobble that was getting worse before I changed the subframe. Oddly the bald tyre and wobble noise came from the driver side whereas the subframe was cracked on the passenger side. The wheel wobble and subframe were playing on my mind as a potential crash problem.
I had to cut one of the outer rod nuts off with an angle grinder because it was so seized and the other side was only marginally easier. The car hasn't been aligned for years if ever. It could be that this was causing the worsening wheel wobble rather than the subframe crack?
I'm going to have a go at aligning it myself and i'll start by reading through your guide, there's no harm in trying and if I can't do it myself it'll be easy for a mobile mechanic or garage now the outer rods have been loosened.
I took pictures of the outer rod nuts so I could see the number of threads at a later time, the left is about 13 threads and the right 15. I guess I'll be using these as an approximate guide but as the alignment was wrong before i started they're not going to be exact.
My question is... how close does the alignment need to be? Can I be 1, 2, or 3 threads off? Roughly when will I notice a wheel wobble?
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If I was doing it I would start by looking at the discoloured part of the threads both sides to work out roughly the original position of the track rod ends, then take the measurements of both sides in case any difference, to use the average length as the starting point.
This way both adjusters will be equal which is an important starting point for setting correctly.
Any further adjustment must be done the same number of turns of adjusters both sides exactly, even a difference of half a turn or less can affect things.
Next I would thoroughly wire brush and clean all the threads, lightly oil so it is possible to run the track rod ends easily along the adjustment area.
Next clean up the locking nuts, so that the mating surfaces where they meet the track rod ends are flat to give a good locking area when tightened, also make sure the spanner will fit easily on the nuts in all positions so remove any burrs from the nuts, again make sure the nuts will run freely on the threaded bar.
Once all that is done I would assemble correctly to the original average starting position equally on both sides and nip up gentle the locking nuts.
Note, there must be a good safe length of thread screwed in, at least roughly 25 mm plus the lock nut afterwards, yours appear to be slightly more which is good.
With car back on the ground all assembled I would drive it, if safe to do so a short run around the block to settle the suspension/steering, it shouldn't pull to one side if everything is correct, if that part is OK, next notice if car feels like it is "hard to keep in a straight line as speed increases" this often indicates "Toe out", whereas if after turning a car the steering wheel appears to quickly "self centre" this can indicate too much "Toe in", although modern power steering sometimes makes these symptoms less obvious.
Either of these if excessive can cause tyre squeal and rapid tyre wear.
All the above is a basic guide starting point, as the only accurate way to set your steering alignment is with the proper garage/tyre depot equipment and an experienced qualified mechanic.
Once all this is done I suggest you then check every nut and bolt you have disturbed in your work to ensure safely secured.
Please note I am highly concerned even offering this simple advice as your and other road users safety is involved, so as soon as the basics have been done I would advise you to get the car booked in for an MOT as a safety measure!