Piston Problems

During oil and filter change, chips and large metal pieces were found. During an annual inspection, the engine oil quick drain valve was blocked with debris. About a dozen pieces of what appeared to be piston ring pieces were removed. While performing a condition inspection, a crack was found on #6 intake. After takeoff, the crew noted engine vibration and lack of power. Inspection revealed excessive oil in the engine area and on the aircraft belly. After a precautionary landing due to power loss, a compression check showed zero on cylinder A4.

Key Takeaways:

• Multiple instances of piston skirt breakage were reported in Continental engines, often resulting in severe internal engine damage and metal contamination.
• Piston ring failures, including broken, seized, or stuck rings due to issues like carbon buildup, also occurred across different engine types, leading to engine damage, power loss, or excessive oil consumption.
• These failures were detected through routine inspections, oil changes, or operational symptoms like vibration and power loss, affecting engines with varying total times in service.

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