John, sometimes when I have a problem such as this I safety wire the bold head
or nut as the case may be. This is a common practice in the aviation industry
because you certainly don't want nuts and bolts coming loose on airplance and
have a component fall off.

Drill a hole through the bolt head, from the center of one flat straight through
to the center of the one directly across. Make it big enough to accept a piece
of 1/32 dia stainless steel safety wire. Push one wire end through the hole,
then wrap back along the edge of the bolt head until the wire from one side
meets the other. Then twist the wires together, and tie it to something else,
keeping it pulled in a tightening direction. If done properly the wire will be
pulling around the bolt head in a tightening direction. It will not back out
until you cut the wire.

On my old "68 bus I used to have, my CV bolts kept coming out. I followed this
safety wire procedure and voila, no more problems.

Good luck.

John Rodgers
"88 GL Driver

John Lauterbach wrote:

> I found the source of my clicking noise today.  Problem same as previous two
> times.  Top bolt on exhaust pipe leading to left rear cylinder again had
> fallen out.  Supposedly, my mechanic had checked this last Wednesday when he
> did oil change and right rear axle transplant.  However, this is Macon, GA,
> and such things happen.
>
> Last spring, I had new exhaust system put on.  In July, the top stud on same
> pipe fell out.  My mechanic put helicoils and new bolts in both holes.
> Obviously something is going wrong as the top bolt is not holding.  Looks
> like it will be easy fix to put a bolt back in, but how to keep problem from
> happening again.  Bolt had a lock washer, but apparently this was not
> enough.  Sounds like I good case for Loctite, but will it take the high
> temps.
>
> Any ideas?
>
> John Lauterbach
> Macon, GA
> 1984 DL