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Front and rear lower control arm eccentrics torque value concern!
I'd appreciate learning peoples opinion regarding the GM Service Manual's torque value indicated for the front and rear lower control arm eccentrics which will be applied during a wheel alignment. As you can see on the attached pages the manual shows 111 ft/lbs plus 90 to 105 degrees for both the front and rear. I believe turning the hardened eccentric nut 90 to 105 degrees after it's already torqued to 111 ft/lbs is guaranteed to snap the eccentric. My fear is that I'll snap the eccentric bolts as I apply the 90 degrees of additional rotation beyond the 111 ft/lbs. Thoughts?
With the disclaimer "All fasteners on this list can be reused after removal" the specifications are NOT putting the bolt into the inelastic region.
I would go with what the spec shows.
I agree. There shouldn't be any problem. C7 eccentric torque values are 125 ft lbs.I doubt they are all that much different in size and material than the bolts used on the previous 3 generations.
When performing the alignment I noticed that the eccentric bolts are a 10.9 hardness. At their diameter, their dry torque range is somewhere around 185 ft/lbs. So torquing to 111 ft/lbs plus the 90 degree additional worked just fine.
Front and rear lower control arm eccentrics torque value concern!
