Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 8LL21/31 is an eight‑cylinder, medium‑speed (1000 rpm) four‑stroke diesel engine delivering 1 760 kW, featuring common‑rail fuel injection and a TCR constant‑pressure turbocharger with jet‑assist and intercooling.
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| item | every 1000-2000 hours for routine maintenance, every 5000-10000 hours for major overhaul |
|---|
| piston ring groove width | 0.5-1.5 mm |
|---|---|
| cylinder liner diameter | 210.5-211.5 mm |
| crankshaft bearing clearance | 0.05-0.15 mm |
| camshaft lobe wear | 0.1-0.3 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyor typically checks for compliance with classification society rules and regulations, including verification of maintenance records, inspection of critical components, and testing of safety systems
Estimated lifetime: 20000-40000 hours before major overhaul
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