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Old 02-18-2012, 01:49 PM   #1
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Is This a UCA Cam Bolt?

I can't see the back of this without removing a wheel. Is this the factory UCA cam bolt on my 2002 TJ?

Also, there seems to be a tang type indicator on each UCA as seen in this pic - are these intended as gauges for the UCA adjustment? One side is about 1-1/2" in a different position than the other.

Lastly, do I loosen the nut on the inside, then adjust the cam by turning the bolt itself?



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Old 02-18-2012, 02:06 PM   #2
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I don't think so! Thats a stock UCA bolt (no cam). Cam bolts are normally on Lower Control Arms that ride a track on axial bracket with keyed bolt and large washers that are off-centered. It makes it look oval and moves on the channeled brackets which moves your axial angle. Pic shows lower control arm cam bolt and washer. Bolt is flat on one side (keyed).
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Old 02-18-2012, 07:29 PM   #3
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The bolt in the lower CA is the cam bolt and you are correct, just loosen the nut, turn the bolt to the desired caster adjustment and re-tighten nut.
The tang on the upper bolt is simply a bolt with tang to allow tightening (or loosening) without the use of a wrench on the nut. The position on the tang has no bearing on any adjustment.

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Old 02-18-2012, 07:59 PM   #4
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It's called a flag nut.
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Old 02-18-2012, 08:42 PM   #5
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Quote:
Originally Posted by Vinman View Post
The bolt in the lower CA is the cam bolt and you are correct, just loosen the nut, turn the bolt to the desired caster adjustment and re-tighten nut.
The tang on the upper bolt is simply a bolt with tang to allow tightening (or loosening) without the use of a wrench on the nut. The position on the tang has no bearing on any adjustment.

Vince
Thanks.

Front wheels need to be off the floor to adjust the cam bolt?
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Old 02-18-2012, 09:01 PM   #6
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Originally Posted by Boyd Crowder View Post
Thanks.

Front wheels need to be off the floor to adjust the cam bolt?
It would be easier to adjust if the front wheels were in the air but it should be do-able with them on the ground.

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Old 02-18-2012, 09:10 PM   #7
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Cam bolts were only installed by the factory on the front lower control arms and they disappeared sometime around '99. Your '02 doesn't have cam bolts on any of the control arms.
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Old 02-18-2012, 09:36 PM   #8
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Originally Posted by Jerry Bransford View Post
Cam bolts were only installed by the factory on the front lower control arms and they disappeared sometime around '99. Your '02 doesn't have cam bolts on any of the control arms.
Ha ha ha,
I mistakenly looked at the picture in the SECOND post, Jerry's correct, upper's never had the cam bolts and they were only on the earlier TJs.

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Old 02-19-2012, 06:21 AM   #9
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Quote:
Originally Posted by Vinman View Post
The bolt in the lower CA is the cam bolt and you are correct, just loosen the nut, turn the bolt to the desired caster adjustment and re-tighten nut.
The tang on the upper bolt is simply a bolt with tang to allow tightening (or loosening) without the use of a wrench on the nut. The position on the tang has no bearing on any adjustment.

Vince

I want to "Thank You" for letting me know that I was correct for sending CAM bolt pics to the original poster!
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Old 02-19-2012, 08:41 AM   #10
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Ok, it looks like the company who installed my 4" RC lift, removed the cam bolts on the LCAs on the front.

While the LCAs are much easier to get to, I assume I should buy adj UCAs for the front, right?

Btw, trying to adjust the pinion angle on the front diff to eliminate vibration.
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Old 02-19-2012, 10:08 AM   #11
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You never had cam bolts to start with.
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Old 02-19-2012, 10:17 AM   #12
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You never had cam bolts to start with.
That could be the case, but according to my Owners Manual, it does. It has an illustration of the cam bolt along with:

Fig. 2 Cam Adjuster
1 - ADJUSTMENT CAM
2 - AXLE BRACKET
3 - BRACKET REINFORCEMENT
4 - LOWER SUSPENSION ARM
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Old 02-19-2012, 11:20 AM   #13
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Your owners manual mentions suspension pieces?
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Old 02-19-2012, 11:27 AM   #14
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Quote:
Originally Posted by Boyd Crowder View Post
That could be the case, but according to my Owners Manual, it does. It has an illustration of the cam bolt along with:

Fig. 2 Cam Adjuster
1 - ADJUSTMENT CAM
2 - AXLE BRACKET
3 - BRACKET REINFORCEMENT
4 - LOWER SUSPENSION ARM
DevilDogDoc is correct, the OP's '02 never had cam bolts anywhere on any of the control arms. As I said above, there was only a pair of cam bolts on the front-lower control arms for the first couple years of the TJ but they went away sometime around 1999. If your manual talks about them, you must have an older TJ.
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Old 02-19-2012, 11:34 AM   #15
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Your owners manual mentions suspension pieces?
Yep. I bought an '02 TJ owners manual on CD on ebay, but come to think of it it was shipped from the UK so maybe their versions were different. The CD does specifically say it's for 02.

Oh well, now I know.

Given that I have new RC LCAs on my front axle, and need to adjust the pinion angle slightly, would you suggest I get adj UCAs, or adj LCAs, or a cam bolt kit? The angle between front pinion and drive shaft is very close to straight anyway - I'm surprised it vibrates...so I don't need much adjustment.
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Old 02-19-2012, 11:35 AM   #16
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Quote:
Originally Posted by Rubicon06Va View Post
I want to "Thank You" for letting me know that I was correct for sending CAM bolt pics to the original poster!

I'm not sure if you are being sarcastic in your response but I mistakenly thought the pic you posted was the OPs picture and replied accordingly.

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Old 02-19-2012, 11:36 AM   #17
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My '06 has CAM bolts 'cause the PO added them with 4" Skycapper lift. I'm slowly removing the entire lift. Next, front adj lower control arms and will eliminate @ that time.
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Old 02-19-2012, 11:43 AM   #18
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Quote:
Originally Posted by Boyd Crowder View Post
Given that I have new RC LCAs on my front axle, and need to adjust the pinion angle slightly, would you suggest I get adj UCAs, or adj LCAs, or a cam bolt kit? The angle between front pinion and drive shaft is very close to straight anyway - I'm surprised it vibrates...so I don't need much adjustment.
The pinion angle is fairly critical (and more important than the caster angle) so if it's not right, the front driveshaft's u-joints will vibrate. The front axle's fore-aft positioning is fairly critical in that if you adjust the pinion angle with the wrong control arm, upper vs. lower, it can cause the axle to be too close to the steering components.

So to decide which arm to go with, upper or lower, which way does the pinion need to go? Up or down? When under power in 4x4, the front axle's pinion shaft will move downward a tiny bit so if anything, you may want it a degree higher than pointing perfectly straight up the driveshaft.
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Old 02-19-2012, 06:35 PM   #19
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Originally Posted by Jerry Bransford View Post
The pinion angle is fairly critical (and more important than the caster angle) so if it's not right, the front driveshaft's u-joints will vibrate. The front axle's fore-aft positioning is fairly critical in that if you adjust the pinion angle with the wrong control arm, upper vs. lower, it can cause the axle to be too close to the steering components.

So to decide which arm to go with, upper or lower, which way does the pinion need to go? Up or down? When under power in 4x4, the front axle's pinion shaft will move downward a tiny bit so if anything, you may want it a degree higher than pointing perfectly straight up the driveshaft.
Pinion needs to go up. Right now it is 2-3 degrees low.
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Old 02-19-2012, 06:40 PM   #20
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Pinion needs to go up. Right now it is 2-3 degrees low.
In that case, I'd go adjustable lowers and shorten the lower control arms to pull the pinion angle up... which will pull the front axle's diff cover away from the steering system by rotating the axle a tad which moves it aft. Ideally you'd go with both uppers and lowers so as to not shorten the wheelbase any more than absolutely required.

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