Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 5LL21/31 is a five‑cylinder, medium‑speed (900–1000 rpm) four‑stroke marine diesel engine delivering about 1 100 kW, featuring common‑rail fuel injection and a MAN TCR constant‑pressure turbocharger with Jet‑Assist and intercooling.
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| item | every 1000-2000 hours for minor maintenance, every 5000-10000 hours for major overhauls |
|---|
| cylinder_liner | 0.5-1.0 mm wear limit, depending on operating conditions and maintenance |
|---|---|
| piston_ring | 0.2-0.5 mm wear limit, depending on operating conditions and maintenance |
| crankshaft_bearing | 0.1-0.2 mm wear limit, depending on operating conditions and maintenance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically check for compliance with regulatory requirements, including emissions and safety standards, and verify maintenance and overhaul records to ensure equipment is properly maintained and operated
Estimated lifetime: 20000-40000 hours, depending on operating conditions, maintenance, and overhaul schedules
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