Re: Blew A Spark Plug

["BMD" <eurocar@gci.net>]

Certainly, on a magnesium Porsche case head stud thread, the most likely
thread to pull in recent automotive history, there is no other choice than a
time sert. All of the above and below are acceptable and professional
repairs. Also a relatively high-skill, or patience, operation.

Bryan Doughty
home.gci.net/~eurocar
----- Original Message -----
From: sehill <sehill@rmi.net>
To: BMD <eurocar@gci.net>
Sent: Tuesday, August 03, 1999 11:04 AM
Subject: Re: Blew A Spark Plug


> In my experience, Helicoils are not the best solution...since they are
only a
> coil of wire, and do not have a solid cross-section, the are not the
strongest
> fix.  Time-serts are the best, imho.  I have use them on Porsche heads and
> cases, and they work much like case-savers.  They have a solid
cross-section and
> work like a threaded sleeve...much stronger, and permanent.
>
> Steven Hill
>
> BMD wrote:
>
> > Heli-coils are original from the factory on some Porsche 911 heads for
the
> > spark plugs and the factory specified repair for Mercedes aluminum block
> > head bolt hole repairs, amongst many other OE applications. They work
fine
> > when installed properly. If the hole is too big for the heli-coil to get
> > proper "bite" you can step up to "bigserts" (solid insert with rather
thick
> > walls) sold by Baum Tools and others.
> >
> > Bryan Doughty
> > home.gci.net/~eurocar
> > ----- Original Message -----
> > From: Don Muirhead <dmr@kwic.com>
> > To: Quattro (E-mail) <quattro@audifans.com>
> > Sent: Tuesday, August 03, 1999 9:06 AM
> > Subject: Blew A Spark Plug
> >
> > > '86 CGT finally popped a spark plug and put a nice ding on the hood
(sniff
> > > - new last year) and left me sitting in a service centre about 140 km
from
> > > home this morning.  While I was waiting for the tow truck I checked
the
> > > rest and I have another thread that's a little weak as well.
> > >
> > > Engine has nearly a million km's so I guess it was due to happen some
day.
> > >
> > > I never had to put a heili in anything so the big questions are:
> > >
> > > 1. To heili-coil or not - does it work, or
> > >
> > > 2. Just replace the head.
> > >
> > > Don
> > > '99 A4
> > > '96 S6
> > > '86 CGT x 2
>