Lycoming 320 Engine Failure

Today, we disassembled a Lycoming 320 that experienced failure. This engine was a high hour engine, so something going wrong was to be expected. Sure enough, after having taken the engine apart, I noticed significant wear as I went on. Excessive wear on one particular valve stem after pulling the rocker cover. Aluminum material in the oil pan, and ultimately a broken lifter and broken piece of the case.

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