OceanSphereENGINES

9H32/40

Main Engine 4-Stroke · Main Engines (4-Stroke)

Technical data from manufacturer or class sources · not yet verified by a person​‍​‍⁠‌⁠⁠‍‍‍​‍‌‍⁠⁠‍‌⁠
9Cylinders
320 mmBore
400 mmStroke

The Himsen H9H32/40 is a 9‑cylinder, L‑configuration medium‑speed marine diesel engine delivering 4 320 kW at 720 rpm, featuring common‑rail fuel injection and Miller‑cycle turbocharging for high power density and fuel flexibility.

Specifications

Technical data.reference — unverified

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Displacement193–643 liters depending on cylinder count
Compression Ratio15:1
Mean Effective Pressure (MEP)25.9/24.9 bar at 720/750 rpm
Specific Fuel Oil Consumption (SFOC)179 g/kWh at 720 rpm; 181 g/kWh at 750 rpm (100% load, ±5%)
Specific Lubricating Oil Consumption0.7 g/kWh
Power per Cylinder500 kW
Mean Piston Speed9.6/10.0 m/s at 720/750 rpm
Dry Weight (6H32/40)64.13 tons
Dry Weight (12H32/40V)85 tons
Design Type4-stroke, turbocharged, Miller Cycle, heavy fuel engine
ConfigurationL
Speed (rpm)720
Fuel TypeHFO/MGO
TechnologyCommon Rail
Inspection

Inspector Detail ✓ verified

Common issues

  • Turbocharger fouling and carbon deposits
  • Fuel system contamination due to heavy fuel oil (HFO) up to 700 cSt at 50°C
  • Cylinder liner and piston ring wear due to high compression ratios
  • Exhaust valve and seat wear due to high exhaust gas temperatures
  • Low lubrication oil pressure and high oil consumption
  • Cooling system leaks and corrosion
  • Starting air system malfunctions

Inspection checklist

  • Inspect turbocharger for fouling/contamination and clean if necessary
  • Check fuel system filters and replace as needed
  • Monitor cylinder liner and piston ring condition and replace as necessary
  • Inspect exhaust valves and seats for wear and replace as needed
  • Check lubrication oil pressure and top up as necessary
  • Inspect cooling system for leaks and corrosion
  • Test starting air system for proper function
  • Check crankcase oil condition and replace as necessary
  • Verify proper function of common rail fuel system

Service intervals

itemevery 1000-2000 hours for routine maintenance, every 5000-10000 hours for major overhauls

Typical wear limits

cylinder_liner0.5-1.0 mm wear limit
piston_ring0.5-1.0 mm wear limit
exhaust_valve0.5-1.0 mm wear limit
crankshaft0.1-0.5 mm wear limit

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • Turbocharger spare parts (e.g. nozzle rings, turbine blades)
  • Fuel injectors and nozzle tips
  • Cylinder liners and piston rings
  • Exhaust valves and seats
  • Lubrication oil pumps and filters
  • Cooling system pumps and heat exchangers
  • Starting air compressors and valves

Safety

  • Risk of explosion due to fuel system leaks or malfunctions
  • Risk of injury from high-pressure starting air system
  • Risk of scalding from cooling system leaks
  • Risk of fire due to hot surfaces or electrical malfunctions

Class survey

Class surveyor typically checks for compliance with manufacturer's maintenance instructions, proper function of safety devices, and condition of critical components such as cylinder liners, piston rings, and exhaust valves

Estimated lifetime: 20000-40000 hours before major overhaul

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