L21/31 Mk2 GenSet
MAN Energy Solutions L21/31 Mk2 GenSet — Marine auxiliary generator set; small-to-medium tankers, cargo ships, ferries; 5–9 cylinders in-line, HFO/MDO/MGO capable, IMO Tier II/III.
Components & Design
Component data being added…
Technical Data
🤖 Ask about this model
One free question — answered like a marine engineer. No account needed.
Common failures & inspection points
Check and change lube oil and filters at prescribed intervals per OEM schedule
Inspect and clean air filter / turbocharger intake and verify turbocharger condition and bearing clearances
Test and calibrate fuel injection system (injector opening pressure, spray pattern, and return flow)
Verify cooling water quality (pH, inhibitor concentration) and inspect heat exchanger / keel cooler for fouling
Check exhaust valve condition, valve clearances, and cylinder head integrity; replace if burn marks or wear limits exceeded
Inspect crankshaft main and connecting-rod bearing clearances and replace bearings at TBO
Test automatic voltage regulator (AVR), insulation resistance of generator windings, and load-sharing between sets
Verify governor response and engine speed regulation under step-load changes; test emergency stop and safety shutdown circuits
Type-general inspection and maintenance points for this equipment category — not model-specific.
Suppliers & Spare Parts
Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.
📄 Request sourcing links & documentsCases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.
Start free trial →Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.
Maritime Network →