Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 12V175D is a medium‑speed, V‑type 12‑cylinder four‑stroke diesel main engine delivering about 1 284 kW at 1 800 rpm, designed for reliable propulsion on commercial vessels. As a Main Engine (4-Stroke Trunk Piston), it is normally installed in the main engine room as a propulsion prime mover connected directly or through reduction gearing to the propeller or propulsion system. In that role, its primary purpose is to convert fuel energy into mechanical propulsion power using a trunk-piston four-stroke cycle. Compared with a two-stroke crosshead engine, a four-stroke trunk-piston engine combines piston and connecting-rod motion directly at the crankshaft and typically operates at higher rotational speed. For exact ratings, dimensions, settings, capacities, materials and variant-specific limits, refer to the manufacturer documentation for the exact figure.
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The MAN 12V175D is a compact SCR system designed to meet IMO Tier III emission standards. It features a closed-loop control system with variable urea dosing and no compressed air requirement.
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Trend oil pressure, coolant temperature, exhaust temperatures, load balance, vibration and crankcase condition. Inspect fuel equipment, filters, coolers, valves, turbocharger, mounts and safety shutdowns according to the maintenance plan. Investigate persistent cylinder imbalance, oil debris or coolant leakage promptly. Refer to the manufacturer documentation for the exact figure for valve, bearing, injection and wear limits.
Carry fuel and oil filters, injector service parts, valve-train and gasket items, cooling-system seals, sensors, belts where fitted and critical bearing or turbocharger consumables.
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