This mechanic states, “I received the turbo-charger check valve (P/N AN6249-6) and installed in the correct orientation. (I) ran the engine and the turbo-charger cavitated due to loss of oil supply. Further investigation revealed the new check valve was backwards internally: the check valve was at the opposite end of the fitting and the flow arrow compared to the original check valve. I would recommend all check valves be examined to verify proper physical flow direction and properties.”

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