the damn thing SNAPPED! [was: Re: pressure plate bolt torque? ]

[auditude at get.net]

Thanks Alex,

I ordered new bolts.  They do not have anything that looks like a washer.  These look like regular allen
bolts.  I got them from Carlsen.

Here's what just now happened.  I put the pressure plate on and bolted it up snug.  Then I removed one of
the bolts, and I put some red loctite on it, #27100.  The Bentley calls for locking compound D 000 600.

Then I proceeded put the bolt back in place, using the lower of the two torque settings, 55 ft lbs, which is
for the shouldered bolts.  The non-shouldered bolt spec is 74 ft lbs.

As I was tightening it with my huge click-type torque wrench, I was thinking that it sure wasn't getting
snug, and it ought to be getting snug anytime soon.

As I feared as I was turning it, the FREAKING BOLT SNAPPED!

So, since I had red loctite about to harden that stupid POS bolt piece in my flywheel, I did the marathon
disassembly and pulled the flywheel back off.  Probably wasted the blue thread compound that came on
the new flywheel bolts.

I managed to get the piece out of there before the damn stuff hardened.  No need for an easy out.  I used
a little nail, a hammer, and finally just the tip of my finger to twist that sucker out.

The fact that I got that piece out of there without much drama, almost made up for the rush of negative
emotion I felt as it snapped.

So, I guess the stupid loctite acted like a lubricant, causing the actual torque to be much higher than the
wrench could feel?

Is there something special about the D 000 600 compound that this is not a problem?  Did I use too much
loctite?  Actually, I know I used too much, because I coated the whole bolt with it, and it was running
down the flywheel.

Any ideas on this?  What a rush!

Thanks,

Ken

On 27 Mar 2002 at 22:37, Alexander van Gerbig wrote:
>
>     You should use the new shouldered type bolt, this means there is a built
> in washer cast into the head of the bolt.  You've seen a shouldered bolt
> before most likely, it has a regular hex head on it, but also flairs out to
> form a built in washer, all one piece.  The flywheel bolts are stretch so
> don't reuse, some have reused, but safety wise I have always gone with
> replacing them.  If you got new bolts from the dealer, which you should,
> then use the shouldered bolt spec.