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  #1  
Old 01-29-2004, 10:00 PM
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How to fix rear alignment

Car is 83SD. Just replaced front end suspension parts, usual suspects such as ball joint, brake support and upper control arm.

Did an alignment (shop with a Hunter machine). The fronts are all aligned to spec. However, the right rear toe is not in spec:
spec range (-0.08* to 0.75*), actual -0.15*

The left rear toe is OK, with reading of 0.14*
The Cross Camber of the rear is also within spec:
spec range (-1.0* to +1.0*), actual 0.8*

What is the usual suspect? Rear subframe mounts? Trailing arm bushings? Car has a slight pull to the right.

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Old 01-30-2004, 12:41 AM
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From the 126 CD

Toe-In

Toe-in results from the interdependent location of the rear axle carrier, semi-trailing arm and the body of the vehicle. The toe-in value depends in certain limits on the vechicle level on the rear axle.

Decisive for evaluation is the total toe-in which results from the values on the left and right hand wheel. If the permissible values (damage following accident) are exceeded, both distortions of the respective semi-trailing arm as well as of the rear axle carrier may be the cause.

Correction

The toe-in can be corrected, if the deviations are minimal, by installing eccentric rubber mounts 123 352 07 65 into the semi-trailing arms.

Possible alteration of toe-in per wheel outside about .10.

Don
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Old 01-30-2004, 01:39 AM
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Thanks for the info.

One dumb question, the right side (in the alignment report) means the right hand side when you sitting in the driver's seat, facing forward?

The negative toe reading (-.15*) means toe-in?

Looks like with .1* eccentric correction, it can be brought back to spec. Is it possible that worn trailing arm bushing can cause toe change? How to check?
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Old 01-30-2004, 07:30 AM
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Shane

Your rear wheel alignment is spot on – don’t touch it!

The actual rear toe-in/out is the resultant of the two readings L and R.

For example: if R = -0.18º and L = -0.25º then total toe = -0.43º
(i.e. out of tolerance).

In your case R = -0.15 and L = + 0.14

Therefore total toe = -0.01º ( i.e. –0.005 per side - almost zero and within spec.)

The rear readings on the print out depend on how accurately the guy has centralized the rear end to the front and mean nothing when taken individually.

Bigred’s quote from the CD confirms this:

Quote:
Decisive for evaluation is the total toe-in which results from the values on the left and right hand wheel.
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Old 01-31-2004, 02:12 AM
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Hi Beagle,

This is interesting. I've checked the tire wear of all four wheels. There is no un-even wear or feathering. I may try swapping tire front to rear. On some roads, I don't feel the pull. Maybe it is induced by the road crown?

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