7L28/32H-GS-60Hz

The MAN 7L28/32H-GS-60Hz is a 7-cylinder, in-line, four-stroke medium-speed GenSet engine of the MAN L28/32H series (bore 280 mm, stroke 320 mm, swept volume 19.7 l per cylinder). According to the manufacturer's project guide it is rated at 1470 kW at 720 rpm (210 kW per cylinder) for 60 Hz GenSets. This marine diesel engine operates on a four-stroke principle with constant pressure turbocharging and intercooling, designed for efficient combustion of heavy fuel oil and marine diesel oil. It is configured for 7 cylinders in a longitudinal arrangement, with a compression ratio of 13.9:1 and a maximum combustion pressure of 130 bar. The engine is designed to meet IMO Tier II emission standards, depending on the variant. Common issues include fouling of charge air coolers due to oil film and oily-water deposits, which can be monitored by checking the charge air temperature and differential pressure across the cooler. Exhaust valve erosion from vanadium and sodium compounds in heavy fuel oil also requires regular inspection during overhauls. Additionally, salt water corrosion in the cooling system necessitates annual inspections of sacrificial anodes and raw water pumps to prevent water flow restrictions. Main bearing wear and fuel nozzle sticking are also typical maintenance concerns, impacting engine performance and efficiency.