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Here is a picture of the expansion plug that came out, and the cam cover plug. Notice how shallow the expansion pug is, only about 1.8” deep. This cap is pressed into the end of the cam, and the widest part is the top/hollow end, so it needs to go all the way into the end of the cam so that the widest part is beyond the chamfer. You don’t want to reuse an expansion cap as they are pressure/interference fit, and once they lose their shape/diameter reuse is very dangerous. All the domestically available expansion caps I found (from Dorman and other) were 2.5+” deep, so that the widest part would not be far enough in the properly fit, this is because of the shoulder inside the cam. And Porsche will not sell just an expansion cap.
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