A vehicle is producing a sharp, metallic rapping sound originating in the upper

roger.clark2

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A vehicle is producing a sharp, metallic rapping sound originating in the upper

A vehicle is producing a sharp, metallic rapping sound originating in the upper portion of the engine. It is most noticeable during idle. Technician A says the problem is the piston pin to piston pin bore clearance is too high. Technician B says the problem is most likely a loose crankshaft thrust bearing. Who is correct?

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