CASE STUDY: Power Generation Plant Mechanical Issue on a Sulzer ZA40S Summary Operations and maintenance personnel identified a mechanical “ticking” sound coming from Cylinder L1. The plant’s peak pressure monitoring also identified cylinder L1 has having the highest peak pressure at 11% higher than the engine average. The increase in pressure was noted after a maintenance activity where the head was removed and reinstalled. Comprehensive engine analysis was performed which determined that the mechanical ticking was occurring just prior (1 deg.) to T op Dead Center (TDC) on the scavenging stroke. With the piston at or very near TDC on the scavenging stroke, both the exhaust valves and intake valves are open. As a result of the analysis, a maintenance activity was performed whic

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