Main Engine 4-Stroke · Main Engines (4-Stroke)
The HiMSEN 8H35/40G engine operates on a lean-burn gas technology, designed to maximize efficiency and performance with natural gas as the primary fuel. This engine features a unique L-configuration with 8 cylinders, each with a bore of 350 mm and a stroke of 400 mm, running at 720 rpm. It delivers a total power output of 4480 kW, making it a powerhouse for medium-speed marine applications. The engine is verified for high confidence specifications, ensuring reliable operation and performance. Common maintenance issues include excessive valve clearance, which can cause high-temperature erosion at valve seats, particularly in exhaust valves, necessitating periodic adjustment according to the maintenance schedule. Additionally, fuel injector nozzle carbon deposits can accumulate when operating on high-sulfur fuels, requiring regular cleaning and proper lubricating oil selection as per MARPOL regulations. Cylinder liner scuffing due to oil film breakdown between piston rings and liner walls is another potential issue, which can be monitored by borescope inspection and lube oil analysis. Crankshaft bearing wear accumulation over long service intervals greater than 16,000 hours also requires crankshaft deflection measurement and bearing clearance checks. Lastly, cylinder cover gasket leakage and gas sealing failures may occur, necessitating proper bolt torque maintenance and periodic gasket replacement as per overhaul procedures.
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| oil_change | 400-600 hours |
|---|---|
| fuel_filter_replacement | 1000-1500 hours |
| air_filter_replacement | 500-1000 hours |
| coolant_change | 2000-3000 hours |
| valve_adjustment | 2000-3000 hours |
| cylinder_liner | 0.5-1.0 mm wear limit |
|---|---|
| piston_ring | 0.5-1.0 mm wear limit |
| valve_seat | 0.1-0.5 mm wear limit |
| crankshaft_bearing | 0.1-0.5 mm wear limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyor typically checks for compliance with manufacturer's maintenance and inspection recommendations, as well as regulatory requirements for safety and environmental protection
Estimated lifetime: 20000-30000 hours
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