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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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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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