 Help with rear trailing arm bolts |
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| sixaddict |
 Sep 21 2012, 10:53 AM
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#1
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Senior Member  Group: Members Posts: 961 Joined: 22-January 09 From: Panama City Beach, FL Member No.: 9,961 Region Association: South East States 
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Car was aligned and corner balanced .....At track discoverd 3 bolts attaching @ front of trailing arm were "tight" yet arm was shifting. So bolts are tight but arm sliding back and forth....Really "interesting" under heavy braking after high speed straight...... (IMG:style_emoticons/default/evilgrin.gif)
I am sure someone can tell me what is up and how to fix.. Thanks Terry |
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Replies(1 - 11)
| Eric_Shea |
Sep 21 2012, 11:02 AM
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#2
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
Do you have the proper Schnorr washers under the bolt head?
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| pcar916 |
Sep 21 2012, 11:10 AM
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#3
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Is that a Lola? Group: Members Posts: 1,523 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None
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Shims (washers) between the arm and it's mount until it won't move laterally any more.
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| sixaddict |
Sep 21 2012, 11:55 AM
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#4
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Senior Member Group: Members Posts: 961 Joined: 22-January 09 From: Panama City Beach, FL Member No.: 9,961 Region Association: South East States
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Eric:
Good possibility they are not there...but frankly not sure. Is this a Porsche only part. Does it in any way impact ability to get negative camber because it was apart to be aligned Thanks Terry QUOTE(Eric_Shea @ Sep 21 2012, 10:02 AM)  Do you have the proper Schnorr washers under the bolt head? |
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| pcar916 |
Sep 21 2012, 12:10 PM
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#5
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Is that a Lola? Group: Members Posts: 1,523 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None
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Just to ask if I'm I understanding right, is the arm moving side-to-side between the mount points?
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| Jgilliam914 |
Sep 21 2012, 12:17 PM
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#6
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914 Guru Group: Members Posts: 5,362 Joined: 30-July 12 From: Iowa / Florida Member No.: 14,732 Region Association: Upper MidWest |
QUOTE(pcar916 @ Sep 21 2012, 01:10 PM) Just to ask if I'm I understanding right, is the arm moving side-to-side between the mount points? That or the rear suspension points are flexing? |
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| ChrisFoley |
Sep 21 2012, 12:23 PM
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#7
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I am Tangerine Racing Group: Members Posts: 7,990 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(sixaddict @ Sep 21 2012, 11:53 AM) Car was aligned and corner balanced .....At track discoverd 3 bolts attaching @ front of trailing arm were "tight" yet arm was shifting. So bolts are tight but arm sliding back and forth....Really "interesting" under heavy braking after high speed straight...... (IMG:style_emoticons/default/evilgrin.gif) I am sure someone can tell me what is up and how to fix.. Thanks Terry There is something keeping the bolts from tightening against the underside of the bracket. Perhaps the bolts were changed and have too long an unthreaded shank, or there is something inside the threaded hole (possibly rust or dirt) causing the bolt to tighten up before its fully against the bracket. There should be a 3 hole plate between the bolt heads and the console bracket. Is that there still? Who did the alignment? Did they use the correct shims? How many shims are in there? Has someone previously "fixed" a broken bolt issue on your car? Shnorr washers are important to keep the bolts from loosening but that doesn't sound like your problem. |
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| toolguy |
Sep 21 2012, 12:47 PM
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#8
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Senior Member Group: Members Posts: 1,276 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California
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Pull out 1 bolt, measure the depth of the hole it's going in compare to the bolt. .
The cheating fix is add a shim plate on top of the factor top plate but I'd only do that as a temp thing. . on older 914 the bolt hole went all the way through. . I seem to recall that later cars they didn't. . if that looks all ok, amybe there is wear problems in the pivot bushings Jack up the car, grab the wheel and see which way it wiggles. . . I'd look at the ears for elongated holes, the inner ear is cracked and flexing, or the bushings are worn out. . When you cant' see the trouble, you'll need to pull it apart. . unfortunately that mean loosing the alignment settings. . and if any of those things are worn, it will need realignment anyway. |
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| Eric_Shea |
Sep 21 2012, 01:46 PM
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#9
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
QUOTE Shims (washers) between the arm and it's mount until it won't move laterally any more. That would change his camber. Chris is on to something; There is supposed to be a plate under the bolt heads. It's rather thick. If it's missing the threaded portion of the fastener could be bottoming out prior to the assembly being tightened properly. |
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| sixaddict |
Sep 22 2012, 03:53 PM
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#10
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Senior Member Group: Members Posts: 961 Joined: 22-January 09 From: Panama City Beach, FL Member No.: 9,961 Region Association: South East States
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Yep...I thought Chris may have hit on it too.
Will post when we get it figured out. Thanks Terry QUOTE(Eric_Shea @ Sep 21 2012, 12:46 PM) QUOTE Shims (washers) between the arm and it's mount until it won't move laterally any more. That would change his camber. Chris is on to something; There is supposed to be a plate under the bolt heads. It's rather thick. If it's missing the threaded portion of the fastener could be bottoming out prior to the assembly being tightened properly. |
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| bulitt |
Sep 22 2012, 06:46 PM
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#11
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Achtzylinder Group: Members Posts: 4,189 Joined: 2-October 11 Member No.: 13,632 Region Association: South East States |
Bolts should be 10mm x 55mm x 1.5 thread. They bolt into the three threaded tubes welded into the front outer control bracket.
Is it possible the threads stripped and someone just put bolt(s) through the tubes with a nut on top? Here is the plate Chris is talking about.  |
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| sixaddict |
Sep 24 2012, 06:39 PM
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#12
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Senior Member Group: Members Posts: 961 Joined: 22-January 09 From: Panama City Beach, FL Member No.: 9,961 Region Association: South East States
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Chris was right ...Bolts were too long
Thanks all (IMG:style_emoticons/default/beerchug.gif) QUOTE(bulitt @ Sep 22 2012, 05:46 PM) Bolts should be 10mm x 55mm x 1.5 thread. They bolt into the three threaded tubes welded into the front outer control bracket. Is it possible the threads stripped and someone just put bolt(s) through the tubes with a nut on top? Here is the plate Chris is talking about. |
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