The M 25 standard power range is from 1,800 to 2,970 kW at 720 to 750 rpm, with a cylinder rating of 300 to 330 kW. The new M 25 C provides a slightly increased cylinder rating of up to 334 kW, boosting the power range to 1,920 to 3,000 kW.

Many minor changes in the M 25 C crankcase area have led to both smoother engine operation and easier engine maintenance. These include a modular lower valve drive, improved crankcase covers and the new speed governor drive.

The M 25 C crankcase is cast in an improved process which gives increased dimensional precision. To accommodate existing engine room designs, the engine footprint for rigid installation and gearbox connection has not changed but for applications with resilient mounting, the use of improved dampers will further reduce engine vibrations and their transmission to the hull. In the case of compact engine rooms, resilient mounting is also available for M 25 C engines with deep oil pans.

The M 25 C crankcase is designed to incorporate advanced emission reduction technologies such as Flexible Camshaft Technology (FCT) and Caterpillar Common Rail (CCR).

The complete turbocharger group is now being pre-assembled, increasing manufacturing quality, and the turbocharger itself is completely covered to comply with the latest SOLAS regulations. The new cladding prevents hot spots while still enabling easy maintenance of the turbocharger and piping.

Two resiliently mounted boxes on the engine contain all the engine control systems, eliminating the requirement for an external control cabinet. One box contains the Large Engine Protection/Safety System (LESS) while the second contains the engine monitoring system and the MOD bus output to the alarm system.

The new control box configuration permits complete assembly and pre-testing of engine control prior to delivery, which reduces engine installation time at the shipyard.