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Old 12-03-2014, 06:40 AM   #1
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Default Replacing lower control arm on S10, torsion bar question

I am planning on replacing the lower control arms on a 1998 4wd ZR2 S10.

I have never worked with torsion bars before. I know they can be very dangerous and be a safety concern. Most research says I need a torsion bar unloading tool
Amazon.com: OTC (7822A) GM torsion Bar Unloading tool: Automotive Amazon.com: OTC (7822A) GM torsion Bar Unloading tool: Automotive
.

I just saw a video where a mechanic just loostned the torsion bar bolt near the rear of a full size Chevy truck without using the unload toolhttps://www.youtube.com/watch?v=3ST9DLuKI0g .

Looking for any advice on the proper way to release torsion arm pressure on the LCA so I can remove and replace the LCA.
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Old 12-03-2014, 07:59 AM   #2
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i think thats just a saftey type thing, like putting a chain on a coil. you can do the same with a cclamp. just measure the distance, so you can put the bolts exactly back were they were
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Old 12-03-2014, 08:27 AM   #3
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Quote:
Originally Posted by jwfirebird View Post
i think thats just a saftey type thing, like putting a chain on a coil. you can do the same with a cclamp. just measure the distance, so you can put the bolts exactly back were they were
Thanks, I just ordered the tool. Did not want to spend the money; but not worth the risk of hurting a limb, no matter how unlikely.
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Old 12-03-2014, 09:11 AM   #4
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Per Alldata for my 2002 S10 4X4


Quote:
Torsion Bar and Support Assembly Replacement


•Tools Required
•J 36202 Torsion Bar Loading/Unloading Tool

Removal Procedure

Notice: Use care when handling the torsion bars in order to avoid chipping or scratching the coating. Damage to the coating will result in premature failure of the torsion bars.


1.Raise and support the vehicle. Refer to Vehicle Lifting.
2.Mark the adjuster bolt.


Quote:
3.Install J 36202 to the adjustment arm and the crossmember.
4.Increase the tension on the adjustment arm until the load is removed from the adjuster bolt.

Important: To aid in assembly, record the number of turns the tool makes when removing the adjuster bolt.


5.Remove the adjuster bolt and adjuster nut.
6.Remove J 36202 from the adjustment arm, allowing the torsion bar to unload.
7.Remove the adjustment arm by sliding the torsion bar forward until the torsion bar clears the adjustment arm.




Quote:
8.Remove the torsion bar support link upper mounting nuts.
9.Remove the torsion bar support link upper mounting bolts.
10.Remove the torsion bar support from the frame.


Quote:
11.Remove the torsion bars. Note the exact direction of the forward end and the side of the torsion bar that is being removed




Quote:
12.Remove the torsion bar links lower retaining nuts.
13.Remove the torsion bar links from the torsion bar support


Installation

Quote:
1.Install the torsion bar links to the torsion bar support.

Notice: Refer to Fastener Notice in Service Precautions.


2.Install the torsion bar links lower retaining nuts. Tighten the torsion bar links lower retaining nuts to 50 Nm (37 ft. lbs.).



Quote:
3.Install the torsion bars in relation to where the bars were removed.
4.Install the torsion bar support to the frame.
5.Install the torsion bar support link upper mounting bolts to the frame.



Quote:
6.Install the torsion bar support link upper mounting nuts. Tighten the torsion bar support link upper mounting nuts to 65 Nm (48 ft. lbs.).
7.Install the adjustment arm to the torsion bar support and slide the torsion bar rearward until the torsion bar fully engages the adjustment arm.



Quote:
8.Install J 36202 to the adjustment arm and the crossmember.
9.Increase the tension on the adjustment arm in order to load the torsion bar.

Important: Tighten the adjuster bolt the same amount of turns that were required to remove the adjuster bolt during removal.


10.Install the adjuster bolt and adjuster nut
11.Remove J 36202 from the adjustment arm and crossmember.
12.Lower the vehicle.
13.Check the wheel alignment.
Attached Thumbnails
Replacing lower control arm on S10, torsion bar question-tbar_1.gif   Replacing lower control arm on S10, torsion bar question-tbar_2.gif   Replacing lower control arm on S10, torsion bar question-tbar_3.gif   Replacing lower control arm on S10, torsion bar question-tbar_4.gif   Replacing lower control arm on S10, torsion bar question-tbar_5.gif  

Replacing lower control arm on S10, torsion bar question-tbar_6.gif   Replacing lower control arm on S10, torsion bar question-tbar_7.gif   Replacing lower control arm on S10, torsion bar question-tbar_8.gif  
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Old 12-03-2014, 09:40 AM   #5
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Mike,

Thanks for the great detail- it is a huge help!
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Old 12-03-2014, 09:46 AM   #6
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Your welcome. Hope it helps!
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