[Vwdiesel] Warped head

[James Hansen]

I've done this with VW case halves years ago.
That is pretty simple, clamp them together, bake.

Landladies do NOT take kindly to the aroma.

Heads require you to put some opposite pressure on them to get a twist 
out if it's bad enough.  I would try just clamping to a plate, and 
heating first.

What used to happen, with case halves, and I suspect that it's partially 
to blame in the case of a diesel head as well, is that the steel 
fasteners don't grow as fast as the aluminum... so the Al heats up, and 
sort of smooshes out.  VW aircooled cases would just pull studs out of 
the case in indignation, but he block is too robust to allow that... so 
the studs eventually stretch, after which the head leaks, but I suspect 
not before plastically deforming the head.  rewarming it *should* allow 
it to come back, at least some.

If the ends are high, like a rocking chair, then you would need to get 
that out with maybe a .010 shim along the middle.. that sort of thing. 
It's far from a science when dealing with cast non-ferrous stuff.  Gimme 
an iron head anyday.

-james

Bryant Baecht wrote:
> James,
>      Have you done this a few times already?  Just more curious about the
> ordeal and more details.  Not for sure about ths shimming.  I was seeing it
> as putting some pressure on the head with the bolts, then heat up and see
> how much closer it gets, but you mention shims?  What type of shims?  Valve
> adjusters?
> 
> Bryant
> 
> 
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
> Behalf Of James Hansen
> Sent: Saturday, June 24, 2006 7:58 PM
> To: William J Toensing
> Cc: vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] Warped head
> 
> 
> an old kitchen stove oven.  Basic as popcorn.
> 
> bolt the head to an inch plate with shims to correct the wrong-ness.
> Bake at 450 for 60 minutes or until tender.  Shut off oven and let cool
> in place.
> 
> -James
> 
> William J Toensing wrote:
>> How would you go about heating a warped head to get it to "relaxe"? I have
> never heard of this before but then there are lots of things I don't know.
> Would you cook it in a stove & if so, at what temperature & for how long? Or
> is there a special oven you have to use?
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