Marine Maintenance Tip #2: don’t overlook oil condition monitoring in slow-speed 2-stroke engines

Large slow-speed 2-stroke marine engines generally use two different lubricants:

• A system oil for bearings and crankshaft components
• A cylinder oil injected onto the cylinder liners

Regular oil analysis helps verify:

• Water or contamination in the system oil
• Wear of piston rings and cylinder liners
• Neutralization of acids produced during heavy fuel combustion
• Whether the cylinder oil BN matches the sulfur level of the fuel

Without proper monitoring, the risks are significant: acid corrosion, liner polishing, and loss of sealing between rings and liners.

In these engines, oil analysis also helps optimize cylinder lubrication feed rates, improving both reliability and operating costs.

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