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Chain Tensioners

Engine

Vehicle Information: Model: 911; Year: 1974; Body Type: Coupe; Total Mileage: 30,000 on Engine;

Recently I experienced what initally appeared to be a worn distributor; a clanking sound was coming from is the left side near the distributor . On closer eximination by my mechanic, turns out it was worn/streached chain on the left side and yes, three bent valves. I had Carrera chain tensioners installed several years ago. All is repaired now, including new chains, etc. My question is how frequently should the chain(s) be inspected for wear and/or replaced.

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