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post #1 of 21 (permalink) Old 08-23-2019, 12:29 AM Thread Starter
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Alignment questions

I finally got around to start the alignment on my 66 coupe. I bought a Longacre digital gauge. I thought it would be easier than the bubble kind. I have played with it about an hour or two. My problems are driving me nuts. I have a question about how to read positive and negative on the gauge. If you look at the picture, there are 2 arrows, one one each side. Either pointing up or down. How do you tell if it is positive or negative. The gauge only shows the number, no + or -

Another problem I am having is the front bolt will not loosen so I can remove or add shims. I have to raise the car up in the air before I can remove the front set. I am afraid that by raising the tire off the ground changes the way the tire sits each time so I get a different reading every time. Is there a simple trick I am missing?

Thanks for any help.

Homer
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Last edited by homer2; 08-23-2019 at 12:31 AM.
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post #2 of 21 (permalink) Old 08-23-2019, 01:15 AM
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When I did my alignment, I had a hard time getting the space necessary to add/remove shims. The upper control arm bolts were really tight in the hole. I finally got a LONG wrench inside the UCA area between the UCA and the frame rail, and gave it a mighty tug. That did it, and went from there.

Can't help you with the gauge reading as I use a bubble gauge.



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post #3 of 21 (permalink) Old 08-23-2019, 05:53 AM
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Read the instructions, or when in position on wheel, move one end away from wheel and observe whether it increases or decreases.

On one car, the bolt splines were not enough to hold it in place while loosening or tightening the nut. Had to finagle a wrench under the control arm to keep from moving.
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post #4 of 21 (permalink) Old 08-23-2019, 07:46 AM
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With the wheel turned and better access, I just stuck a BMF screwdriver or pry bar to move the control arm out slightly to install shims.

On my bubble gauge if I'm on the left side, I turn the wheel to the left 20°, zero the gauge and turn it 40° or 20° to the right and the caster number will show.

It's pretty easy to tell if you have positive or negative caster just by looking at the wheel when turned. If you're on the left, turn the wheel to the left. For positive, you can see the top of the tire is leaning back. Negative, iti leaning to the front

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post #5 of 21 (permalink) Old 08-23-2019, 07:48 AM
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Looks to me like the arrows are telling you which direction each end of the level is tilted, ie in your picture the left side is down and the right side is up a total of 2.9 degrees.

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post #6 of 21 (permalink) Old 08-23-2019, 08:30 AM
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Yep, the arrows indicate the tilt of the gauge and consequently the tilt of your tire. To keep the tires neutral after raising and lowering, I folded up a couple of heavy trash bags and put under the tires. After lowering, bounce on the front end a few times and your tires should be sitting about where they're going to.
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post #7 of 21 (permalink) Old 08-23-2019, 08:36 AM
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They have their instructions online. Hopefully this'll help:
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post #8 of 21 (permalink) Old 08-23-2019, 09:30 AM
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I don't know about everyone else, but I think they should fire whoever it was that chose those symbols for that display. For me, those arrows do not show the actual direction of tilt but instead the direction you would have to move it in order to achieve "Level". Look at their diagrams, the reference to "Level", and the arrows being displayed.
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post #9 of 21 (permalink) Old 08-23-2019, 09:48 AM
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Bubble caster/camber gauge is much easier to use. Don't need no newfangled digital contraptions.
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post #10 of 21 (permalink) Old 08-23-2019, 10:00 AM
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Are these tools easy to use? How do you get the car to sit at a consistent ride height after adjustments? Is it just just a matter of cycling the suspension over and over and checking the your alignment tool multiple times?
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post #11 of 21 (permalink) Old 08-23-2019, 10:20 AM
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Quote:
Originally Posted by Miguelito2.0 View Post
Are these tools easy to use? How do you get the car to sit at a consistent ride height after adjustments? Is it just just a matter of cycling the suspension over and over and checking the your alignment tool multiple times?
The tools are fairly easy to use, once you know what you are doing.

If you have stock type rubber bushings, never tighten the suspension while the car is on jack stands. set the car down with the weight on the tires, then tighten the bolts. When aligning, after you make an adjustment, roll the car back and forth, this will settle the suspension. You may have to make adjustments several times because the adjustments are all interrelated. You may have to sort of sneak up on the adjustments to avoid over adjusting. It's just trial and error for the most part. Like anything that's an art, the more you do it, the better you become at it.

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post #12 of 21 (permalink) Old 08-23-2019, 11:40 AM
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Quote:
Originally Posted by Rufus68 View Post
I don't know about everyone else, but I think they should fire whoever it was that chose those symbols for that display. For me, those arrows do not show the actual direction of tilt but instead the direction you would have to move it in order to achieve "Level". Look at their diagrams, the reference to "Level", and the arrows being displayed.
Looking at the instructions again, I believe you're right. I think the easiest way is to remember that you want the arrow closest to the wheel pointing up. That will indicate negative camber as well as positive caster when the unit is in caster mode.


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post #13 of 21 (permalink) Old 08-24-2019, 01:20 AM Thread Starter
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I went to that link that was posted and found the instructions. I did not get all 3 pages that are on the site. At least now I have them.
I am still confused by the wording on page 2 and 3. One says this little icon must be on the display screen when normal (or caster) use. Push zero if not on. The next page leaves out the (or caster). So when I measure Camber the icon must be on the screen. But the instructions say move the wheel 15 degrees, level the gauge and then hit zero. The little icon never comes on when measuring caster. But it says it has to be on. After you move the wheel and level the gauge, it says hit zero. Now 0.0 should be flashing. No icon is on. So it says to hit zero to make it come on. When I do that, the reading goes back to what it was before I zeroed it. Should the little icon be on when measuring caster?
Any body have one like this? What do you do when measuring caster?

Thanks for any help.

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post #14 of 21 (permalink) Old 08-24-2019, 06:55 AM
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They do have videos on using the gauge. Hopefully this helps. If the link doesn’t work, try googling.

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post #15 of 21 (permalink) Old 08-24-2019, 09:22 AM
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This might help... but of you've used custom parts....your settings may be different. These are STOCK settings....
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