Re: [alfa] Re: shims

[Mark Denovich <mark@xxxxxxxxxxxx>]

Dean wrote:

> When they are not perfectly flat they will become fatigued at one point and
> the shim breaks. It makes a mess at the top of the valve stem, collets and
> springs. It is very hard to have a machine finish when sanding the shims by
> hand. Many people I know use only original shims. They wont even trust  a
> machined one.
Are you saying this applies to Alfa shims specifically?   or shims in 
general.   I have heard of problems with larger shims used in other 
makes.

When I sanded mine I put a piece of sandpaper (400grit) on a piece of 
plate glass, coated it with oil, and made a small handle that which had 
a tip that was the inside diameter of the shim.    The handle made it 
easy to keep the force and sanding action perpendicular to the paper.  I 
finished with 1000 and 1500 grit silicon carbide papers which resulted 
in a near mirror finish.

I tried spotting them on a surface plate, but I couldn't see any height 
variations.

I'm not too worried, but I guess time will tell.

--Mark
The Alfa Wiki: http://alfa.denovich.org
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