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Front end alignment

Aggiesrok

New Member
I’ve got a 67 coupe, 289, C4, 9 in rear

I’ve replaced upper and lower control arms, shocks, spindles, tie rod ends, eccentric bolts.
But I have a consistent problem with the right front wearing out the tire, left also but not as bad. I buy two new tires and have it aligned and seems like less than 10k miles the tires are toast almost overnight. The alignment shop is an old shop and one of few that does classic cars, they have laser equipment too. It’s a reputable shop, it seems to lose its setting. And he torqued the hell out of it since I’ve pointed out the problem.
The car is a daily but isn’t raced and is typically driven short distances in town. There doesn’t appear to be anything weak or loose. It is manual steering and an original gear box.
What could cause it to just lose alignment?


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Horseplay

I Don't Care. Do you?
How are the tires wearing? Pics would help a lot. Bear in mind, the original alignment could be off leading to the wear so it is not necessarily "losing" alignment. The tire wear on even a really bad alignment doesn't happen overnight.
 

Aggiesrok

New Member
How are the tires wearing? Pics would help a lot. Bear in mind, the original alignment could be off leading to the wear so it is not necessarily "losing" alignment. The tire wear on even a really bad alignment doesn't happen overnight.
It just seems to happen quickly. These pics are from the previous issue. It seems to be camber each time. Currently I think it’s outside wear, I’ll get some current pics later.




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Aggiesrok

New Member
Here are the current pics. Left isn’t too bad but right is starting to wear the outside. Tires don’t have enough miles to be so worn




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Starfury

Well-Known Member
Wow, that's a lot of wear, and is not just from camber. Improper toe is causing that. Basically the tires are riding sideways down the pavement. Because the camber is negative, this wear is focused on the inside of the tire.

First thing I'd look at is your steering. Check everything for play. Any play in the steering is going to allow the toe to change while going down the road.

Then check the suspension to make sure ball joints and control arm bushings aren't sloppy.

Then, and this is the most important part, get a new freaking alignment shop. Any good alignment shop should be able to find the problem in short order. Also, 67s are super simple to align. Unlike 65-66, they don't require shims, so any good shop should be able to do it.
 

Starfury

Well-Known Member
As a follow up, I used to sell tires and do alignments. I'd warranty tires like that if we did the alignment on the car at time of sale, and have words with the alignment tech.
 

Aggiesrok

New Member
Wow, that's a lot of wear, and is not just from camber. Improper toe is causing that. Basically the tires are riding sideways down the pavement. Because the camber is negative, this wear is focused on the inside of the tire.

First thing I'd look at is your steering. Check everything for play. Any play in the steering is going to allow the toe to change while going down the road.

Then check the suspension to make sure ball joints and control arm bushings aren't sloppy.

Then, and this is the most important part, get a new freaking alignment shop. Any good alignment shop should be able to find the problem in short order. Also, 67s are super simple to align. Unlike 65-66, they don't require shims, so any good shop should be able to do it.
Thanks for the input. I feel like it’s either the steering or something structural that isn’t easily seen. The steering is original and probably worn out. I’ve added grease and adjusted the steering box, but has some slop in it.
The upper and lowers have been replaced fairly recently and torqued to spec.


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B67FSTB

The NorCal dude from Belgium
Like Starfury said, play. If upper and lower control arms are replaced and torque to specs, still check for play.
Steering , yes. Look for play in steering linkage expecially the centerlink and idler arm. Look for up and down movement of the centerlink/draglink.
I believe you have to have 1/8 toe in .
A good alignmentshop should see or check out the front suspension and steeringlinkage prior the actual alignment.
So back to the alignmentshop I would say and show him the result.
 

Horseplay

I Don't Care. Do you?
Tad nailed it. That looks like wear from really bad toe. 1/8" is as much as you want. I set mine up at about half that. Could also happen do to slop in the steering set-up which would allow more toe to happen. Camber can eventually lead to uneven wear from side to side of a tire but it takes a long time and would never be that dramatic. I'll post up a pic of my car in a bit but I run A LOT of negative camber and after thousands of miles the tires show no sign of wear like that and I drive it hard into any corner I can! I am also running a very soft compound tire which would wear much faster than a typical street tire.

Bottom line is whoever is doing your alignment is not good at it and/or didn't find what must be very obvious problem(s) with your front end. You need a new guy! Or better yet, do it yourself. You can buy the necessary tool(s) for about $150. Like Tad wrote, alignments on a '67 are pretty easy.
 

scedd

Well-Known Member
And dont forget to use new or evenly worn tyres when you do the alignment. If you set it up on badly worn tyres, you are setting it TO the current wear.
 
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