Shannon:
5/16-24 (so called UNF or fine thread) is correct for stock.
However, if you go with 5/16-18 you can use an off the shelf
"manifold stud" which is
coarse thread (UNC) on one end, fine thread on the other. By putting the
coarse end into the
trailing arm, you will have a stud that is much less prone to pulling
out, since the coarse
threads are much stronger in aluminum.
The Triumph engineers made a bad call on this design, using fine
threads in the aluminum
trailing arm. HOWEVER, I have not heard of anyone experiencing a failure
from studs pulling
out of the trailing arm. I *HAVE* heard of broken axles however, and
they are hardened steel!
So perhaps the concerns over UNF threads in the trailing arms are
overwrought.
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Shannon Muncy
Sent: June 10, 2005 9:16 AM
To: 6pack@autox.team.net
Subject: Helicoil information needed
Listers,
I need to buy a helicoil kit for a couple of loose studs for my rear
trailing arms. I found a tech article on the 6-pack.org website
stating that I needed 5/16-18 helicoils. I was always under them
impression that if I want to reuse the stock studs that the thread was
5/16-24. Which is the correct one to buy?
Thanks in advance,
Shannon
72 TR6
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