RE: scirocco-L-digest V1 #1932

["Brian Wagner" <scirocco_88_16v@hotmail.com>]

If they are a stretch or a Torque to Yield bolt it is not advisable to reuse 
them. After you have applied the initial load to the bolt and then remove 
them the bolt has a different tensile yield pattern. As explained below

Torque-to-Yield Bolts

One-time-use, or torque-to-yield (TTY), fasteners take advantage of the 
torque yield principle. Most torque specifications build in a 25 percent 
safety margin--they can be overtorqued by 25 percent before damage occurs. 
TTY bolts do not have this safety zone. They are designed to be tightened 
just into the yield point but not to the extent that the metal is distorted. 
The advantage is they deliver 100 percent of their intended strength, versus 
the 75 percent strength provided by regular bolts. The drawback is that they 
can only be used one time. Once they are removed from an application, they 
can no longer support the load they previously did, and they must be 
replaced with TTY bolts.


Brian

87 16v
86 8v (parts car)
85 Wolfsburg (white coming to a garage near me soon)



>From: "Fry, Larry" <LEF@chem-tronics.com>
>To: Brian Dettling <aa821@acorn.net>, scirocco-l@scirocco.org
>Subject: RE: scirocco-L-digest V1 #1932
>Date: Tue, 30 Oct 2001 10:30:56 -0800
>
>Brian-
>   ...lower front spring pad on 16V would make sense.
>No reason why you can't re-use clutch bolts, since they are 
>"stretch-bolts".
>
>Larry  sandiego16V
>
>-----Original Message-----
>From: Brian Dettling [mailto:aa821@acorn.net]
>Sent: Tuesday, October 30, 2001 9:06 AM
>To: scirocco-l@scirocco.org
>Subject: Re: scirocco-L-digest V1 #1932
>
>
>RE:  16V/8v spring rates.
>
>Some guestimates that may resolve the sring rate discussion.
>
>I figure my 87 16V OEM rate was 128-135 lb/in front.
>84 GTi (2 yellow + 1 green) front were 106-122 lb/in
>	rear for same 97lb/in.
>FYI, the Gti and the 16V Scirocco have a front lower sring perch that's
>lower than some old mystery struts.
>
>RE:  Replacing clutch fasteners
>
>Am considering repalcing the flywheel on short term 8V clutch.  Should I
>replace all the fasteners are can some be reused with the appropriate
>LocTite?
>
>TIA,
>
>
>--
>
>
>Brian D./OH
>How can you be in two places at once when you're not anywhere at all...
>Firesign Theatre
>
>q
>
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