Quote:
Originally Posted by freshblake
I can't see how he would get pre engagement with shaving the 3rd and 4th teeth.
It looks like he did all that shaving to do exactly that - prevent PE. Unfortunately it created a lot of stress on the other teeth on the piston which is why it stripped and he was able to get 1k rounds.
If he had a crazy thick sorbo on the cylinder head his piston would be sitting too far back thus creating a poor angle of engagement opposite to the original angle he was trying to correct.
Assuming the first tooth is already removed you only need to brush that second tooth with a file and ensure the cylinder head has the proper thickness of spacer for a proper AoE.
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I think we're getting the same idea.
The AOE is off on the first tooth to start with, but there's too much gap between the first and next tooth, which alters the AOE of the sector engaging that next tooth, creating extra stress. That tooth fails, the sector gear spins in place (engages that first tooth for the remaining 7-9 teeth of the sector).