5L28/32H

Monitor scavenge air temperature (target 40-45°C), measure differential pressure across cooler, inspect tubes for oil deposits, check air filter condition for sealing leaks

Visual inspection of exhaust valve seat and plate during overhaul, spectral analysis of lube oil for vanadium/sodium levels, verify fuel oil quality compliance (max 3.5% sulphur), check combustion pressure consistency across cylinders

Inspect sacrificial anodes (zincs) every 12 months and replace when ~50% consumed, annual raw water pump impeller replacement, check sea strainer condition, measure cooling water temperature differential across heat exchanger, flush raw water system with fresh water after salt water operation

Measure main bearing and rod journal mean diameter for wear and out-of-roundness using micrometer during overhaul, compare against service manual limits, record bearing clearance progression in maintenance logs, inspect bearing metal surfaces for squeezing, scoring, cracking, or pitting

Test fuel nozzle opening pressure on test stand, verify atomization pattern, inspect needle surface for pitting/scratches and spring length/elasticity, check for dripping at idle, measure exhaust gas temperature per cylinder for anomalies