12M55

Inspect turbocharger for oil leaks, blade pitting, axial/radial play exceeding 0.5mm, and carbon buildup on compressor blades; verify boost pressure within specification (typically 1.5-2.5 bar for marine applications)

Visual inspection of cast iron block, cylinder head, and exhaust manifold for cracks, stress patterns, and corrosion pitting; measure wall thickness in high-stress areas; check for heat discoloration indicating overheating zones

Establish baseline crankcase pressure reading with engine at operating temperature and 75-80% load (typically <0.08 bar); elevated pressure above 0.15 bar indicates blow-by requiring bore/ring inspection or overhaul assessment

Inspect fuel filter condition and micron rating; verify rail pressure at 2200 bar nominal (Baudouin M/F series specification); perform injector spray pattern test; check for black smoke under load indicating incomplete combustion from fouled injectors

Inspect heat exchanger tube bundles for saltwater corrosion and perforation; verify freshwater coolant condition (pH, inhibitor concentration); check zinc anode erosion (replace if >50% consumed); inspect seawater strainer/intake for blockage and biofouling