Torques for Upper Control Arm Shaft Bushing Bolts

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Mar 13, 2022 | 01:00 AM

nwav8tor

Thread Starter

Old Fart Pilot

Joined: Apr 2010

Posts: 1,932

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From: Spokane, WA

Torques for Upper Control Arm Shaft Bushing Bolts

The AIM for my '71 isn't clear to me on this.

Page 3-A2 shows that the LOWER Control Arm Shaft end bolts should be torqued to 45-55 LBS-FT with a note to tighten with suspension compressed to height at which geometry is set.

However there is no such data for the UPPER Control Arm shaft end bolts. Am I correct to assume that the values & note should apply to BOTH upper & lower control arm shafts??

Thanks

Paul

Mar 13, 2022 | 07:56 AM

sw69vette

Racer

Joined: Apr 2020

Posts: 264

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From: Sicklerville NJ

2022 C3 of the Year Finalist - Unmodified

Yes , I used the same torque specs on both upper and lower control arm bushing end bolts on my 69 .

Mar 13, 2022 | 09:01 AM

interpon

Le Mans Master

Joined: Jun 2019

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From: Indiana

45-55 foot pounds for 79..and it sure seemed like a lot on that size bolt.
on my tight area on upper could only get a small wrench on the fronts so they are finger bruised tight.

Mar 13, 2022 | 09:44 AM

Mooser

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Joined: Apr 2011

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From: North of Toronto - Ontario

The arms were supplied as assemblies which is why they don't call out the bolts / torque like "normal"
Remember to tighten with the suspension at ride height
I also couldn't get a torque wrench onto the front-passenger bolt so tighten the crap out of it (and loctite)
M

Mar 13, 2022 | 10:02 AM

hornetball

Instructor

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From: Granbury, TX

C2 has basically the same suspension. 1963 Service Manual has 45-55 for the lower end bolts (page 3-11) and 35-40 for the upper end bolts (page 3-12).

Mar 13, 2022 | 10:18 AM

Mooser

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From: North of Toronto - Ontario

FWIW, 72 Chassis manual had the uppers at 60, AIM was 45-55 ft-lb
With loctite and new bolts I went 45 on a clicker everywhere I could
M

Mar 14, 2022 | 06:06 PM

nwav8tor

Thread Starter

Old Fart Pilot

Joined: Apr 2010

Posts: 1,932

Likes: 1,001

From: Spokane, WA

Quote:

Originally Posted by sw69vette

Yes , I used the same torque specs on both upper and lower control arm bushing end bolts on my 69 .

Quote:

Originally Posted by interpon

45-55 foot pounds for 79..and it sure seemed like a lot on that size bolt.
on my tight area on upper could only get a small wrench on the fronts so they are finger bruised tight.

Thanks-you Interpon. I see that page also just references the lower shaft end bolts (Z & 4) - nothing for the upper shaft

Quote:

Originally Posted by Mooser

Quote:

Originally Posted by Mooser

FWIW, 72 Chassis manual had the uppers at 60, AIM was 45-55 ft-lb
With loctite and new bolts I went 45 on a clicker everywhere I could
M

Thanks Mooser, surprised there was a difference between the AIM and Chassis Manual.

Quote:

Originally Posted by hornetball

C2 has basically the same suspension. 1963 Service Manual has 45-55 for the lower end bolts (page 3-11) and 35-40 for the upper end bolts (page 3-12).

Thanks - Maybe they found the different torques for upper & lower weren't really necessary and they just went with a common value for the C3s. I guess it can't hurt to use a bit less on the uppers. At least it may be easier to see if any of the upper bolts start to back out...

Thanks again all!

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