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RE: Reuse of head bolts ...
Actually 6 pt bolts are reusable but Audi say don't use them at all anymore,
use ONLY 12 pt bolts (Audi/VW call these polygon bolts). The 12 pt bolts are
stretch bolts and they are reusable but when replaced they must be replaced
in complete sets. 12 pt bolts do not require re-torque after 1000 miles as
do the 6 pt bolts. ARP or Raceware bolt/studs are also stretch fasteners and
are reusable. As a tech at a VW/Audi dealer when they switched from 6 pt to
12 pt I had mixed feelings. I no longer had to try to get a customer to
bring their car back in a 1000 miles for a re-torque after a repair but I
also got less time to do a 1000 mile service (easy money) on a new car. The
12 pt bolts are fine for most any engine, custom high performance use
Raceware or ARP or such.
From: Autobahn01@aol.com [mailto:Autobahn01@aol.com]
Sent: Thursday, November 18, 1999 8:36 PM
To: firstname.lastname@example.org; email@example.com
Subject: Re: Reuse of head bolts ...
In a message dated 11/18/99 4:15:31 PM Eastern Standard
> my understanding is that if your bolts have the 12-point
spline heads on
> them they are not stretch bolts and can be reused.
> since our experience is coincident, i can't help you much
more than that...
Nah, that'd be backwards. The olde style 6pt(hex) head bolts
while the 12pt ones are not recommended to be so. You can
get away with it,
but why risk a gasket failure due to uneven clamping force
from a tired 2$
bolt? The OEM bolts are good enough for all but the most
highly modified 10vt
motors, esp set up with a torque angle gauge and calibrated
coupla q's, mostly 12pt bolts