Gads.  The other option would be to use a stud that is 10mm on one side and
8mm on the other.  Easier to find the tap and does not require the purchase
of keen-serts.  I've done both.  Both work well as long as the old hole is
not terribly rounded out, in which case you coudl not tap it 10mm.

Z

-----Original Message-----
From: Jim Arnott [mailto:jrasite@EONI.COM]
Sent: Wednesday, January 10, 2001 1:26 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Stripped threads in cylinder head, to fix?, now?, how?

Right-o!  IIRC the 8mm x 1.25 Keen-sert requires a 12mm x 1.25 tap.  I
could trudge through the snow out to the garage to check, but...  The
'odd-ball' bit comes from the standard taps in a metric t&d set being
12mm x 1.50 and 12mm x 1.75.

Jim

David Beierl wrote:
>
> At 02:57 PM 1/10/2001, Mladen, Zoran wrote:
> >Why are you recommending going to 12 mm from 8mm.  I'd go to 10mm...
> >
> >Z
>
> The tap as well as the drill have to be precisely the right one for the
> size of insert.  He was opining (guessing?) that 12x1.25 is the right tap
> size, but the way to know is to check the specs on the insert
> package.  They must be followed *exactly* or the job will fail.
>
> david
>