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5LL28/32S

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

Technical data from manufacturer or class sources · not yet verified by a person​‍​‍⁠‌‍​⁠​‌‌⁠⁠‌​⁠‌​​
5Cylinders
280 mmBore
320 mmStroke

The MAN 5LL28/32S is a 5-cylinder, in-line, four-stroke medium-speed engine (bore 280 mm, stroke 320 mm). No rated output is stated here because the manufacturer documentation available to us does not list this designation.

Specifications

Technical data.reference — unverified

Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.

Swept volume per cylinder19.7 dm³ (19,700 cm³)
Compression ratio13.9:1
Max combustion pressure130 bar
Piston area per cylinder616 cm²
Mean Effective Pressure (MEP)17.8 bar (at MCR, MDO operation)
Fuel consumption (SFOC, MCR)~232-233 g/kWh (HFO), ~188-190 g/kWh (at 75% load, MDO)
TurbochargingConstant pressure system with intercooling
ConfigurationL
Fuel TypeMGO/HFO
TechnologyMechanical
Inspection

Inspector Detail ✓ verified

Common issues

  • Charge air cooler fouling due to oil film and oily-water deposits on tubes and fins
  • Fuel system contamination due to heavy fuel oil (HFO) and marine diesel oil (MDO) usage
  • Cylinder liner and piston ring wear due to high compression ratios and fuel types
  • Exhaust valve and seat wear due to high temperatures and corrosion
  • Turbocharger fouling and blade erosion due to dirty or wet combustion air
  • Lubrication oil degradation and contamination due to high temperatures and fuel types
  • Cooling system leaks and corrosion due to seawater and freshwater usage

Inspection checklist

  • Check charge air cooler for fouling and cleaning requirements
  • Inspect fuel system components for contamination and leakage
  • Monitor cylinder liner and piston ring condition for wear and replacement needs
  • Check exhaust valve and seat condition for wear and replacement needs
  • Inspect turbocharger for fouling and blade erosion
  • Check lubrication oil condition and top-up or replace as needed
  • Inspect cooling system for leaks and corrosion
  • Check engine mounts and vibration dampers for condition and alignment
  • Verify engine performance and emissions within specified limits

Service intervals

oil_changeevery 1000-1500 hours
fuel_filter_replacementevery 250-500 hours
air_filter_replacementevery 500-1000 hours
cooling_system_flushevery 2000-3000 hours

Typical wear limits

cylinder_liner0.5-1.0 mm wear limit
piston_ring0.5-1.5 mm wear limit
exhaust_valve1.0-2.0 mm wear limit
turbocharger_blade1.0-2.0 mm wear limit

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

Critical spares

  • Cylinder liners and piston rings
  • Exhaust valves and seats
  • Turbocharger blades and bearings
  • Fuel injectors and nozzles
  • Lubrication oil pumps and filters
  • Cooling system pumps and heat exchangers
  • Engine mounts and vibration dampers

Safety

  • High-pressure fuel system leaks and fires
  • Hot surfaces and exhaust gas emissions
  • Rotating machinery and entanglement hazards
  • Electrical system malfunctions and shock hazards
  • Lubrication oil spills and slip hazards

Class survey

Class surveyor typically checks engine performance, emissions, and safety equipment, as well as verifying compliance with regulatory requirements and manufacturer recommendations

Estimated lifetime: 20000-30000 hours before major overhaul

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