Guys,

Installing a new flywheel (for new Textralia clutch), I tightened the bolts to 100ft-lbs.
Then, reading the torque for the pressure plate bolts, I saw that it was given in N-m.

I immediately checked the re-checked the torque for the flywheel and it was actually 100N-m not 100ft-lbs.
..And 100ft-lbs is significantly more than 100N-m.

These are Grade-8 bolts that I bought the last time I swapped flywheels a few years ago.

What is the best thing to do at this point?

• Leave the bolts as they are and finish the installation;
• Loosen the bolts and re-torque them correctly;
• Remove the bolts and discard them--order some new ones;

 

Go back and redue it of course.

 

What I am really asking is: Are the bolts ruined?

 

No. Loosen/re-torque in staggard steps of three-

 

Replace the bolts, they're cheap and there's a good chance that you've stretched them beyond limits. If they fail, the results would be way too severe to warrant not spending the money on new bolts. Torque specs are a ball park way of measuring bolt stretch. It's the bolts natural tendency to contract from this stretch that makes it stay in place, and provide fastening force. When you over stretch bolts, they get weaker, and don't want to spring back to their original size, and thus don't hold as well.

 

Thanks guys.

 

Torque specs are set by the physical bolt size, and is based on a percentage of their yield strength IIRC (undergrad was a long time ago at this point). If it was me, I'd replace them as they are cheap, and easier to replace while you have it all apart.

 

Another vote for replacing the bolts.

 

Okay, thanks guys. Gonna replace those bolts.

And while we are at it, I'd like to suggest that we eliminate the use of the ft-lb in all documentation and instrumentation.

 

Bolts are cheap and it is easier to change the bolts now.

 

Damn english measurements.

 

Replace them...

AND DON'T FORGET THE LOCTITE!!!!!

Had a buddy nearly toast his tranny with some PP bolts backing out with his tex clutch

 

i'd replace them and go with some good ole ARP bolts...I love mine...

 

Your feet and the back of your motor are too valuable not to make sure you have a good fastener. When a clutch comes through the floor it isn't good.