 How out-of-round can the A-Arm become and still be used? |
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| DaveB |
 May 14 2022, 03:07 PM
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#1
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Member  Group: Members Posts: 169 Joined: 25-November 21 From: Portland, Oregon Member No.: 26,107 Region Association: Pacific Northwest 
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So I pulled the A-Arm on my '75 and it's badly worn. The torsion bar has worn smooth on one side and the inside of the A-Arm looks like this:
 This is really worn on one side. I'm replacing the bushing with the spherical and I am concerned with how out-of-round this opening has become. So my question is how worn can the center of the A-Arm be to support a rebuild and 100K miles of use? I also have no idea what is on the end of the torsion bar. It was filled with grease and a sticky sponge.  Thanks, DaveB |
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| mepstein |
May 14 2022, 03:25 PM
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#2
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914-6 GT in waiting Group: Members Posts: 19,855 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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The sponge is a donut shaped seal for the end of the bar near the adjuster side.
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| mgphoto |
May 14 2022, 03:28 PM
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#3
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"If there is a mistake it will find me" Group: Members Posts: 1,375 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
There is a small sponge on the end of the torsion bar, soaks up the grease prevents the grease from escaping.
Is the torsion bar damaged? Press off the bushings clean things really good and than inspect. The new bushings might be all you need. |
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| 914werke |
May 14 2022, 03:59 PM
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#4
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"I got blisters on me fingers" Group: Members Posts: 11,231 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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Wow what a mess, Ive never seen an A-arm that worn from the T-bar/bush sagging. The torsion bar HAS to be equally compromised. Theoretically the T bar should never hit the A-arm tube so it might still be usable but Id find another.
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| DaveB |
May 14 2022, 05:58 PM
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#5
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Member Group: Members Posts: 169 Joined: 25-November 21 From: Portland, Oregon Member No.: 26,107 Region Association: Pacific Northwest
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QUOTE(914werke @ May 14 2022, 02:59 PM)  Wow what a mess, Ive never seen an A-arm that worn from the T-bar/bush sagging. The torsion bar HAS to be equally compromised. Theoretically the T bar should never hit the A-arm tube so it might still be usable but Id find another. The torsion bar has a flat area where it rubbed. It's really bad. The other side is normal wear and the torsion bar is still all red. Not a bad idea to find a better A-arm. Thanks, DaveB |
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| RoadGlue |
May 14 2022, 06:42 PM
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#6
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Sonoma County Gear Head Group: Admin Posts: 2,033 Joined: 8-January 03 From: Santa Rosa, CA Member No.: 108 Region Association: Northern California
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I have a set of stock 914 17.9 mm torsion bars I can send you if you're willing to cover shipping from NorCal. Send me a message here if you're interested. -- Randy
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| bdstone914 |
May 14 2022, 07:08 PM
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#7
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bdstone914 Group: Members Posts: 4,888 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
@DaveB It is the rubber bushing that is distorted. Very common. It does not mean the A arm is out of round. Those bearing brackets need to be round to work with sperical bearings. |
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| mepstein |
May 14 2022, 07:16 PM
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#8
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914-6 GT in waiting Group: Members Posts: 19,855 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Bruce nailed it. (IMG:style_emoticons/default/beerchug.gif) |
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| 914werke |
May 14 2022, 07:35 PM
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#9
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"I got blisters on me fingers" Group: Members Posts: 11,231 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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 Absolutly the sagging of the bushing is the cause, but you can see the T bar has ground the A-arm tube because of it. |
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| DaveB |
May 15 2022, 02:16 PM
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#10
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Member Group: Members Posts: 169 Joined: 25-November 21 From: Portland, Oregon Member No.: 26,107 Region Association: Pacific Northwest
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QUOTE(RoadGlue @ May 14 2022, 05:42 PM) I have a set of stock 914 17.9 mm torsion bars I can send you if you're willing to cover shipping from NorCal. Send me a message here if you're interested. -- Randy Randy - I really appreciate the offer but I'm going to put in a slightly bigger T-bar to adjust for the increased breaking with my set-up. Regards, DaveB |
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| r_towle |
May 15 2022, 07:08 PM
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#11
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Ok,
If you are going racing, strip that a-arm and make sure it’s going to hold up to the new stress. Second…just my experience..which may be meaningless. Stick with stock torsion bars up front Get the biggest adjustable sway bar you can get Get koni adjustable struts. After all my setups, I realized heavy bars up front actually remove a lot of adjustment (200 lbs on drivers side only) and in the end it made the car push way to much. Tunable struts and tunable sway bar are the best….again this is just an opinion. |
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