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Sprocket alignment issue. You can see where the sprocket has started to rub against the chain wheel support in the second picture. Broke the tops off all the teeth. I bet you have found most of the pieces. However, there is some good advice here. Replace the tensioner sprocket, bolt, and chain wheel support and any broken or worn ramps. Check the chain for stretch.
Drain the oil, change the filter, flush it with cheap stuff, run it until it gets hot, drain it again, change the filter. That will cost you, um, not so much. If you find more chunks, you know what to do. If you find no more chunks in the drain pan, filter, or in the chain housing, you got lucky.
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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