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Does anyone know the actual or even estimated failure rate of the old design? The internet is relatively quiet about the issue compared to number of engines produced. Nothing compared to N47 timing chain issues. My bet is the failure rate is actually quite low.
Another question is why is this only N20 issue when the timing chain and some of the chain guides are same in N52 and N55 engines? I never heard of timing chain issues in those engines.
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