Notices
Wheel and Tire Forum
Sponsored by:
Sponsored by:

3 Piece torque specs

 
Old 09-23-2002, 11:02 PM
  #1  
MachSchnell
User
Thread Starter
 
MachSchnell's Avatar
 
Join Date: Jul 2002
Location: Pompano Beach, FL
Posts: 723
Post 3 Piece torque specs

Anybody know proper torque specs for assembly of a 3 piece wheel? I'm assuming it should be put back together with a similar tightening procedure to a regular lug tightening pattern, working crosswise in a star fashion...but I want to make sure I have the torque spec'd properly to avoid leaking or tightening the wheel out of round...

TIA
MachSchnell is offline  
Old 09-24-2002, 12:32 AM
  #2  
joey bagadonuts
Addict
Rennlist Member

 
joey bagadonuts's Avatar
 
Join Date: Mar 2002
Location: Highland Park, IL
Posts: 3,606
Post

Here's a quote from one of the moderators, Bill Gregory, who was advising me on the purchase of some BBS racing wheels, the type with magnesium centers:

[quote] If you get them, you may want to get a torque wrench with a needle/scale dial gauge, with a foot inch scale, so you can torque the bolts to 145 foot inches, which is around 12 ft lbs. Those bolts come loose over time - I check the torque after each days run, prior to the next event. <hr></blockquote>

Hope that helps!
joey bagadonuts is offline  
Old 09-24-2002, 11:23 PM
  #3  
MachSchnell
User
Thread Starter
 
MachSchnell's Avatar
 
Join Date: Jul 2002
Location: Pompano Beach, FL
Posts: 723
Post

That definitely helps, thanks very much!
MachSchnell is offline  
Old 09-25-2002, 12:43 AM
  #4  
A930Rocket
Super User
 
A930Rocket's Avatar
 
Join Date: Oct 2001
Location: Mount Pleasant, South Carolina
Posts: 7,568
Post

joey bagadonuts,

[quote] If you get them, you may want to get a torque wrench with a needle/scale dial gauge, with a foot inch scale, so you can torque the bolts to 145 foot inches, which is around 12 ft lbs. Those bolts come loose over time - I check the torque after each days run, prior to the next event. <hr></blockquote>

Glad to hear this, as those are the wheels I use on my '87 930 at the track. I've also heard that they are one time use bolts (as in stretch bolts). Not sure how this plays into re-torquing them repeatedly though?

Also, I was told to pull them apart, inspect for cracks, etc. and reassemble every year.

Jim
A930Rocket is offline  
Old 09-25-2002, 04:20 AM
  #5  
Danno
Super User
 
Danno's Avatar
 
Join Date: Jul 2001
Location: Santa Barbara, CA
Posts: 14,077
Exclamation

Also would be a good idea to use a little blue Loctite as well. Since there are no lock-washers or locking mechanisms of any kind, vibration can loosen those bolts and cause your rim-halves to flex. This increases the loads on those bolts and causes them to fail from fatigue.

This happened on my BBS Race wheels because the bolts were too loose on the front rims. They worked themselves loose and started snapping. Replacing ALL of them with new bolts, Loctited and tensioned to the correct torque solved this problem for good.
Danno is offline  
Old 09-25-2002, 09:57 AM
  #6  
Bill Gregory
Super Moderator

Technical Specialist
Rennlist
Lifetime Member
 
Bill Gregory's Avatar
 
Join Date: May 2001
Location: CT
Posts: 5,846
Post

[quote]<strong>I've also heard that they are one time use bolts (as in stretch bolts). Not sure how this plays into re-torquing them repeatedly though?</strong><hr></blockquote>

I just had a head snap this weekend when I retorqued one wheel, which is probably the 5th time I've retorqued them (after replacing with fresh bolts). I use a dial gauge, so over torquing wasn't the cause. Although BBS doesn't recommend loctite when assembling, when I replace the bolts this winter, I plan to loctite them in.
Bill Gregory is offline  
Old 09-25-2002, 11:42 PM
  #7  
A930Rocket
Super User
 
A930Rocket's Avatar
 
Join Date: Oct 2001
Location: Mount Pleasant, South Carolina
Posts: 7,568
Post

If you use Loctite, can you retorque them, breaking the "bond" and have the same results and/or benefits of the Loctitie?

I've always felt that once you break the Loctite free, you've lost it's integrity/strength.

Jim
A930Rocket is offline  
Old 09-26-2002, 10:16 PM
  #8  
Bill Gregory
Super Moderator

Technical Specialist
Rennlist
Lifetime Member
 
Bill Gregory's Avatar
 
Join Date: May 2001
Location: CT
Posts: 5,846
Post

[quote]<strong>I've always felt that once you break the Loctite free, you've lost it's integrity/strength.

</strong><hr></blockquote>

I would agree with that. The purpose of using Loctite would be so one wouldn't have to retorque the bolts on a regular basis. Doesn't mean you don't inspect them frequently.
Bill Gregory is offline  

Thread Tools
Search this Thread
Quick Reply: 3 Piece torque specs


Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: