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Old 05-26-2019, 10:35 AM   #3
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Join Date: Sep 2016
Location: Stow, MA
Posts: 837
Worn cam chain tensioner pads. The brown bits are pieces off the pads.

If the chain gets loose enough it can skip a tooth. Try turning the engine manually and see if you can get the slots for the cam locking tool to line up. As far as I remember they should both be vertical at the same time. That should give you a clue.
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