LA-S Series

• High reliability and performance realized by technology built over our 100 years of history, and our manufacturing results and experience that exceed an equivalent of 12 million engine horsepower.
• The LA series has been improved by making its stroke longer to raise its stroke efficiency, and reducing its revolution speed so it can directly connect to a slowly rotating crankshaft without passing through a reduction gearbox.
• The LA series uses fuel-efficient marine engines with consideration for low NOx emission (reduction of CO₂).
• The LA series reduces noise and prevents oil splashing by adopting a hydraulic valve driving system.
• By equipping an L-save ring on the upper part of the cylinder liner, surface wear of the cylinder liner is lessened and lubricating oil consumption is reduced.

While the intake and exhaust valves were previously driven by a push rod system, it now uses a hydraulic valve driving system. This reduces the noise around the cylinder cover and prevents oil splashing.

The hydraulic valve uses the system oil as its hydraulic oil, so there is no need for a specialized hydraulic pump or filter.

With the conventional structure, hard carbon is deposited on the top land of the piston. This hard carbon rubs against the cylinder liner wall surfaces, wearing down the cylinder liner and increasing the consumption of lubricating oil.

The addition of an L-save ring can control the deposition of hard carbon on the top land of the piston so that there is no wear of the cylinder liner wall surfaces by hard carbon, suppressing cylinder wear and increased consumption of lubricating oil.