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From my memory there was information in the literature about doing this. I believe that Porsche said to start reversing some of the washers. Not to remove them. Normally the washers are stacked concave face to concave face in pairs along the stack. The new arraignment would have some of the washers arraigned convex face to concave face only for a few washers. The amount is found by trial and error.
As you know when fully warm the stack has expanded. (I think the movement was about 10 mm) The pump has to be set up in this condition. If the stack has been altered, the warm protrusion is usually less. That means the pump will be exceedingly rich at this setting. Whenever the stack length is altered in the warm mode the pump has to be re calibrated. This is not a five minute adjustment.
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