12V50DF

Visual inspection of piston crowns and rings through scavenge ports; Monitor residual Base Number (BN) in cylinder oil - must not be lower than BN10 for fuels with 0.1% < S < 0.5%; Verify iron (Fe) content in oil below 500 mg/kg; Regular piston underside inspections mandatory

Monitor cylinder cooling water outlet temperature - maintain as close as possible to alarm limit during low-load operation; Check cylinder oil chemistry (BN, iron content); Review engine load profile and operating hours at part load; Ensure proper cylinder oil selection (Mobilgard 5100 or equivalent approved for cold corrosion mitigation at 0.8 g/kWh feed rate)

Borescope inspection for liner wall condition - look for loss of crosshatch grooves, polished appearance; Monitor for increased blow-by (crankcase pressure); Check piston rings for scuff marks; In-situ liner honing may be required if glazing detected

Check turbocharger oil inlet and outlet lines for blockages or kinks; Monitor engine lube oil condition and change intervals strictly; Listen for abnormal turbocharger noise (grinding, whining); Verify turbocharger is running smoothly with no axial/radial play; Inspect for oil discharge from compressor outlet

Monitor fuel quality - verify compliance with ISO 8217:2012 marine fuel standard; Check fuel temperature in hot box (typically 45-50°C); Inspect fuel strainer/separator condition frequently; Monitor engine performance - loss of power, rough running, black exhaust smoke may indicate nozzle coking; Schedule regular fuel injector cleaning/replacement if necessary