Rear composite spring torque spec - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Rear composite spring torque spec

Reply
 
 
 
Thread Tools Search this Thread
Old 05-27-2013, 02:03 PM   #1
CA-Legal-Vette
CF Senior Member
Thread Starter
 
CA-Legal-Vette's Avatar
 
Member Since: Jul 2004
Location: Scottsdale and Foster City AZ and CA
Posts: 7,201
Thanked 50 Times in 49 Posts
Default Rear composite spring torque spec

Looks like this will be my wtf for the day. A couple of weeks back, I found an Allen head bolt under the car. I guessed it was for the rear sway bar but just didn't get a chance to look until today. Those bolts are fine, as are all the drive and half shaft bolts. Instead, I found one of the four bolts that hold the composite spring almost ready to fall off. The other forward bolt was loose but not nearly as much. The other two seem fine.

First question, what is the torque spec?

Second question, do these loosen up as the rubber shrinks? Is this an issue?

Always something. Still have no idea of where the bolt came from.
CA-Legal-Vette is offline   Reply With Quote
Old 05-27-2013, 02:48 PM   #2
CA-Legal-Vette
CF Senior Member
Thread Starter
 
CA-Legal-Vette's Avatar
 
Member Since: Jul 2004
Location: Scottsdale and Foster City AZ and CA
Posts: 7,201
Thanked 50 Times in 49 Posts
Default When is the sound of breaking steel a good thing?

When it doesn't cost as much as you initially thought.

This would be best read with the accompaniment of continuous swearing. I've worked with Marines, so I put my swearing skill level somewhere between Corporal and Sargeant. Too bad I'm not any good at recording video on my camera.

I found the torque spec on the VB&P web site: 40 to 45 foot pounds. Also instructed to tighten evenly. I also remember reading Gary's differential posts on cracking covers with wrong sized bolts. Since I had no idea of where these came from so I proceeded slowly. 12 pounds all around, then 18, then 22, then colossal sound of metal breaking. Begin swearing.

As a bit of background, I'm in the process of moving from the Bay area of California to Boston. A differential rebuild doesn't easily fit in the program right now.

Once I was able to get my swearing slightly under control, I crawled back underneath and, after wiping the forehead blood off of the undercarriage, I notced the the retaining plate split in two. Been a long time sine I've been thrilled with breaking something in half.

VB&P has a sale on this weekend too

Edit: Important clarification. The retaining plate is aluminum and not steel

Last edited by CA-Legal-Vette; 05-27-2013 at 03:51 PM.
CA-Legal-Vette is offline   Reply With Quote
Old 05-27-2013, 05:46 PM   #3
jotto
CF Senior Member
 
jotto's Avatar
 
Member Since: Oct 2005
Location: Redruth Cornwall
Posts: 2,031
Thanked 4 Times in 4 Posts
Default

Hey Mike, Glad it wasnt as bad as you first thought! Not sure I can imagine anything much worse than the odd Bloody coming from you but hey what do I know! lol.
Regards to all!
jotto is offline   Reply With Quote
Old 05-27-2013, 09:20 PM   #4
C2C3PO
CF Senior Member
 
Member Since: Oct 2011
Location: Edmonton Alberta
Posts: 130
Thanks: 0
Thanked 1 Time in 1 Post
Default

OP, my experience when tightening these bolts to the spec listed (40-45 ft./lbs) was that when using a torque wrench and carefully bringing up to the expected limit it seemed to take forever to bring it up to the final few ft./lbs.
I knew something was wrong and immediately switched to a second torque wrench to verify the reading I was getting.
What I found was that the material (spacer and spring) is "plastic" and deforms thus reducing the reading rather quickly.
When I finally achieved the desired spec I left it over night and checked again and the torque spec read almost 7 ft/lbs less than the day before.
I called the Tech Support line and advised them of this, however no solution or advice was given in terms of whether this damaging to the spring and mounting hardware.
I wish I could offer some direction but I cannot - I can understand how this could happen though !
C2C3PO is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Rear composite spring torque spec
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Composite Rear Spring...which one for the Vette to sit level? vetteguy75 C3 Tech/Performance 8 01-03-2015 03:36 PM
    rear spring issue greyghost79 C3 Tech/Performance 16 11-30-2014 12:08 PM
    Remove & Replacement of Rear Suspension Spring dofdear C6 Tech/Performance 8 07-01-2014 12:31 PM
    Question - Rear Spring AF_Vette C3 General 3 04-13-2014 12:27 AM
    wanted composite rear spring 1BADL82 C3 Parts for Sale/Wanted 5 06-20-2013 11:34 AM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 06:04 AM.