[Vwdiesel] Used Pistons/Head

[James Hansen]

As said, different machine shop.
The best shops use cubic boron nitride cutters now, and the cutter cares not
a whit how hard it is. Besides, being in the combustion chamber, unless a
very special steel, it will be soft. If the shop is using older insert
technology, you don't want your head milled by them.  The surface finish
will not be smooth enough to seal properly on what is considered to be a
high performance sealing surface. Only way to get it smooth enough is with
CBN, or diamond cutters.

Proper way to get rid of warp actually is to clamp the bare head to a flat,
and bake it to relieve the stress and get the warp out.
Serious, not joking.
-James



> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
> Behalf Of E. J. Gilbert
> Sent: Thursday, April 29, 2004 9:31 AM
> To: vwdiesel at vwfans.com
> Subject: [Vwdiesel] Used Pistons/Head
>
>
> Hi Guys,
> I am up to my elbows in a Jetta Turbo Diesel engine.  So far, the
> head is warped and cracked between valves. There is a definite
> ridge at the top of the cylinders.  Machine shops say that they
> cannot flatten head due to the very hard prechamber inserts.
> Does anyone have used oversized pistons and a head for sale?  Any
> other ideas would be appreciated.
> Thanks,
> E.J.
>
>
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