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1986 Rear Camber Adjustment Bolt

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Old 04-13-2018, 05:52 PM
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rrt898
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Default 1986 Rear Camber Adjustment Bolt

I have a 1986 coupe. I rebuilt the entire rear with poly bushings. My problem is that the right side camber moved about one degree neg. I had it realigned and the same thing happened after a short drive. I have no idea why it moves. I had everything torqued to specs. Could the camber rod bolts be bad or bent?? I have decided to order a kit for both sides. After that I'm at a loss?? At least I haven't been charged additionally for the alignments but; I'm sure I will eventually.

Any help would be appreciated!!!
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Old 04-13-2018, 06:12 PM
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Kevova
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Is bolt rotating? If not a bushing(s) is deteriorating at a rapid rate
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Old 04-14-2018, 01:40 PM
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Originally Posted by Kevova View Post
Is bolt rotating? If not a bushing(s) is deteriorating at a rapid rate
That's about the only thing I can think of. Unless the bushings aren't thick enough is the only other thought I have.

If you can't get it resolved, about the only other thing I can think of is something like the Banski parts, pretty much impossible to shift as long as the collars are properly tightened up. All adjustments are via the heim joints on the part.
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rrt898 (04-15-2018)
Old 04-14-2018, 06:44 PM
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Default Camber

I ordered two new bolts for each side. I'm going to try again on Wednesday. I will double check the bushings.
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Old 04-14-2018, 07:24 PM
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Joe C
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there should be a set of metal bushings on each side of the camber rod assembly, PN 14060166. is everything correctly configured? just asking. the I.D. of the sleeve within the camber rod is larger than the O.D. of the adjusting bolt. without the 14060166 bushings, the camber rod could have, or would have, some movement regardless of the amount of torque on the adjusting bolt. sounds like the bushings maybe MIA - at least on one side.







these are work in progress pics, but you get the idea. BTW, OE parts are discontinued and residual NOS parts are crazy expensive. IF you need to purchase the bushings, reproductions are available - about $10/pack of 4 (plus S&H) here's corvette central - https://www.corvettecentral.com/c4-8...et-of-4-584103


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Old 04-14-2018, 09:00 PM
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..... Changes in ride height will also affect the camber adjustment ... maybe your car didn't get jostled around enough after the new bushings were installed .....
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Old 04-16-2018, 11:24 PM
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Does anyone know the torque specs on tightening the camber bolts???

Thanks....
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Old 04-17-2018, 02:03 AM
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Originally Posted by hcbph View Post
That's about the only thing I can think of. Unless the bushings aren't thick enough is the only other thought I have.

If you can't get it resolved, about the only other thing I can think of is something like the Banski parts, pretty much impossible to shift as long as the collars are properly tightened up. All adjustments are via the heim joints on the part.


I have the Banski lower spindle arms, quick easy and precise accurate adjustment that doesn't change. I would never go back to the offset camber bolts.
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Old 04-17-2018, 02:41 AM
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Originally Posted by rrt898 View Post
Does anyone know the torque specs on tightening the camber bolts???

Thanks....
I seem to recall, 187 ft.lbs. across the board for all C4's. personally, i'd verify that for 1986 corvette specific.
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Old 05-05-2018, 08:49 PM
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Small Update. I purchased a set of camber bolts. I paid a little more because I wanted the right ones with the alignment markings. The bolts came and I paid no attention that they have a locking washer. When I took mine off, I didn't have a locking washer. I guess a previous owner forgot to put them back or a mechanic. This is the first time I have had the camber bolts adjusted. I know it wasn't me. I don't know why the camber never moved before I installed new bushings. The locking washer is doing its job. The camber is perfect and has not moved at all.

thanks again.
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Old 05-05-2018, 10:50 PM
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..... I have taken a bunch of these apart and have never seen a lock washer on a camber eccentric bolt & nut ... at these torque levels , a lock washer could easily break and fall out leaving the bolt dangerously loose .....
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Old 05-05-2018, 11:37 PM
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The kit came from Zip Corvette. I just searched the web and every kit has the locking washer. I am not saying they are right but; I had no idea it didn't belong. I thought I was done with this.
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Old 05-06-2018, 12:11 AM
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Originally Posted by C409 View Post
..... I have taken a bunch of these apart and have never seen a lock washer on a camber eccentric bolt & nut ... at these torque levels , a lock washer could easily break and fall out leaving the bolt dangerously loose .....


Originally Posted by rrt898 View Post
The kit came from Zip Corvette. I just searched the web and every kit has the locking washer. I am not saying they are right but; I had no idea it didn't belong. I thought I was done with this.
I have referenced the 84-93 Y-body parts and illustrations manual, and there is NO lock washer associated with the cam bolt rod adjustment assembly. if aftermarket kits are supplying a lock washer, they are wrong. now whether the lock washer is OK to use or not, I really can't comment. the only thing I can say for sure is there was no lock washer from the factory, and with the amount of torque applied, any additional locking device, IMO, is overkill.





edit: it seems that a lock washer is called out for use with the 63-82 cam bolt assemblies. not sure why it was eliminated in 84, but i'm guessing using the additional lock washer for the C4 won't impact anything. to use it or not, your call....

Last edited by Joe C; 05-13-2018 at 07:29 AM.
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Old 05-08-2018, 11:23 PM
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The C4 rear camber adjustment is a bit notorious for having the eccentrics move and change alignment. The previous owner of my 96 experienced this when autocrossing on sticky tires. Banski arms were definitely the solution. That said, I can imagine that the urethane bushings make it more likely that the eccentric can move. They don't allow compliance with out-of-axis camber arm movement, yet they have to move out of axis (fore and aft at the upright) because of the arcs the trailing arms cause. You can imagine them "walking" the eccentric bolt in and out, because they don't allow compliance in that plane like the rubber bushings did.
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