Honda Accord (1990 - 2002) Includes 1997 - 1999 Acura CL

negative caster?

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Old Mar 10, 2016 | 07:43 PM
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Default negative caster?

I took my car in for an alignment and they told me that I have negative caster. I recently bought the car and replaced the outer tie rods because the boots were torn. After the alignment I took the car in my daily commute, about 60 miles. The car was squirrely on the highway and shook at times (death wobble?).
The steering wheel is really easy to turn, the steering is responsive, just nothing to it. The car just kind of strays away, and you can feel it in the steering wheel but it's controllable, it's gentle not like a jerk. The steering wheel doesn't return to center when turning, you have to steer it back.
When I got home from work that day and it looks like the upper control arms were put on the wrong sides.
My question is, if the control arms are on the wrong sides, would it cause these problems?
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Old Mar 11, 2016 | 03:08 PM
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Default Re: negative caster?

Are the front wheels centered in the fender wells?
Check the radius rod(#8/9) that attaches to the lower control arm and bolts to underneath the radiator. On the engine side check if there area any shims added. If not, what might have happened is there was work done and the front radius rod bushings were installed backwards. There is a large and small bushing. If the longer radius rod bushing(#13) was put on the engine side this would push the radius rods back which would push the lower control arm back and you would have negative caster. For stability you want positive caster. Looking from the side of the car the top of the knuckle would be tilting towards the rear of the car.

If both sides have equal caster then the bushings were probably installed incorrectly. Look for witness marks on the radius rod bolts(#25).
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Old Mar 11, 2016 | 04:26 PM
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Default Re: negative caster?

Originally Posted by MAD_MIKE
Are the front wheels centered in the fender wells?
Check the radius rod(#8/9) that attaches to the lower control arm and bolts to underneath the radiator. On the engine side check if there area any shims added. If not, what might have happened is there was work done and the front radius rod bushings were installed backwards. There is a large and small bushing. If the longer radius rod bushing(#13) was put on the engine side this would push the radius rods back which would push the lower control arm back and you would have negative caster. For stability you want positive caster. Looking from the side of the car the top of the knuckle would be tilting towards the rear of the car.

If both sides have equal caster then the bushings were probably installed incorrectly. Look for witness marks on the radius rod bolts(#25).
Thank you, I didn't even think about the radius rods. One more thing to check. The reason that I was thinking the upper arms are on the wrong side is because they lean to the front of the strut. I used to have an 89 Accord and I remember the upper arms leaning to the back of the strut. I could be wrong too.
The caster is -5 and some change on both sides, it should be between 2 and 4. Are there any other parts I should look at?

Last edited by dh1212; Mar 12, 2016 at 10:14 AM.
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Old Mar 13, 2016 | 01:09 PM
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Default Re: negative caster?

Originally Posted by dh1212
Thank you, I didn't even think about the radius rods. One more thing to check. The reason that I was thinking the upper arms are on the wrong side is because they lean to the front of the strut. I used to have an 89 Accord and I remember the upper arms leaning to the back of the strut. I could be wrong too.
The caster is -5 and some change on both sides, it should be between 2 and 4. Are there any other parts I should look at?
Just so you know, I haven't been able to tell if the radius rod bushings were switched, but they look original from what I can tell. I was correct with the upper control arms however, the steering wheel feels stiff and now it will return on its own. When cornering the car glides through the corner and straightens much much better and more solidly. My new question is should I go get another alignment?
The car drives straight and holds straight now, but I'm wondering how much caster that fixed.
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Old Mar 14, 2016 | 01:17 AM
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Default Re: negative caster?

Part number 15 are alignment shims. These are what adds or removes caster. It might be best to have Honda do an alignment and make sure they fix the caster issue using the shims. I'm sure they know how to do this but most non-Honda shops either don't want to go through the work of removing the radius rod to shim it to fix the caster or they just may not have any shims. It's not easy to remove and install the radius rod so most guys are just lazy.
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