Had a catastrophic failure of a piston and the metal bits chewed on everything everywhere. The rotary valve was cut to pieces and both sides of the valve and the valve cover had wicked scratches in it. I put the cover on the mill and took off the first thou on pass number one and what jumped out at me was the wear (natural) around the valve holes. It took 3 thou to clean up the cover. Most of that was not the scratches but was just wear. Pretty surprised and just passing this along as food for thought.
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Milling rotary valve 717
- Thread starter studdy05
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Used cases in good shape are cheap and easy to come by. You sound like the kind of guy who is going to get your tolerances right but careful not to have too many hours in a hundred dollar part.
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