I ordered a used 16v transmission from Adirondack when mine went bad. The
aluminum piece that the clutch cable goes through broke off, so they had
it welded back on. I haven't had any problems with it at all since then.
That's just my experience though. You never know, maybe it will snap off
one of these days. I doubt it though. Adios!
Markos
On Tue, 18 Jan 2000 10:57:38 -0800 Clayton <[email protected]> writes:
>Okay, the most common Casting alloy used in transmission housing (US
>alloy,
>that is... Germans usually use their own alloys) is 201-T6. Now this
>is a
>basically comercially pure aluminum with 4.5% Cu (copper) added. With
>7%
>elongation, it will have a tensile strength of 70,000psi and a yield
>strength of 63,000psi. That similar to 7075-T6 to give you an idea as
>to
>the strength. ANYWAYS, to get that kind of strength, the alloy uses
>what
>is called Solidification strengthening. The casting molds and
>processes
>are designed very carefully to have the best compromise of grain
>structure. It is then probably artificially heat treated. When you
>weld
>the material, you are re-melting and cooling the material around the
>heat
>affected zones which not only remove the solidification strengthened
>properties, you are probably warping the areas around it as the
>stored
>energy is released... basically you can find a broken transmission
>with a
>good case and use that without the worries you will have if you try to
>weld
>an already broken transmission case. And if they are using a truly
>non-weldable alloy... it'll be even worse. In order to do a proper
>job if
>you decide to weld over the hole I suggest you send a small piece to
>a
>metal testing company and ask them to find the alloy out (about $15
>ea) and
>then get the right welding rod and someone familiar with welding that
>alloy.
>Later,
>Clayton
>
>[email protected] wrote:
>
>> On Tue, 18 Jan 2000 09:12:29 -0800 Clayton <[email protected]>
>writes:
>> > Most castable aluminum alloys aren't weldable... if you want a
>more
>> technical explaination on the list I can provide but I didn't
>> > want to bore the list.
>> > Clayton
>> You wouldn't be boring us. 8^)
>>
>> Let's hear it.
>>
>> Peter
>> '79 Scirocco 16V project car
>> '80 Scirocco
>> '88 Scirocco 16V
>> '83 GTI, daily driver
>> '87 GTI 16V for parts
>>
>>
>>
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