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chain noise

Engine

Vehicle Information: Model: 911sc; Year: 1978; Body Type: Coupe; Total Mileage: 212000;

recently i've been hearing chain/rail type noise when i accelerate rapidly thru 4-4500 rpm. I had the tensioners "updated" back in '84/85 shortly after the first upgrades were available. is this something that can be fixed by "adjusting" the tensioners or this more serious. the car runs perfectly otherwise.

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