8LH41L
The Hanshin 8LH41L is an eight‑cylinder, 2‑stroke medium‑speed marine diesel engine delivering 5 600 kW at 500 rpm, noted for its compact size and relatively high rpm among 2‑stroke designs.
Engine Specifications
Inspector Detail
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Designation decoded
8 for 8 cylinders, LH for L-type H variant, 41 for 410 mm bore, L for long-stroke. Specs: stroke 550 mm. Hanshin EL series — 8-cylinder version of the largest EL engine, maximum output in the entire Hanshin portfolio.
Background
The 8LH41L is the most powerful engine in the entire Hanshin portfolio: 8 cylinders with a 410 mm bore and 550 mm stroke. It represents the upper limit of what Hanshin Diesel Works offers in output. Used on the largest Hanshin-powered merchant ships.
Calculated metrics
Inspector checklist
- Cylinder liner: 410 mm × 8, 550 mm stroke — maximum Hanshin configuration
- Piston rings: Hanshin × 8 — largest rings
- Crosshead: 8× largest Hanshin EL bearing
- Camshaft: 8-cyl — longest and heaviest Hanshin camshaft
- Fuel pumps × 8: largest Hanshin plungers
- Valve clearance × 8: Hanshin manual
- Crankshaft deflection: especially important at 8 cylinders and 410 mm
- Injection nozzles × 8
- Fuel: HFO — full treatment plant required
- Fuel separators: cat fine removal
- Stuffing box × 8: drainage
- Exhaust valve × 8: mechanical — largest Hanshin valves
- Turbocharger: 1× (possibly larger TC than standard EL) — condition critical, no redundancy
- Scavenge air cooler
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature after cylinder | 335-410 °C at 85% MCR | Spread >15 °C — compare systematically across 8 cylinders |
| Scavenge Air Pressure | 1.3-2.2 bar abs at MCR | Turbocharger |
| Engine speed | 160-280 rpm | Load/governor |
| Crankshaft deflection | Per Hanshin/class limit values | At 8 cylinders: foundation and bearings |
Common Failure Modes
Expert tips
- 💡 8LH41L is the absolute Hanshin flagship engine — at this configuration one approaches the limits of the Hanshin portfolio; for higher output, one must switch to MAN/WinGD/J-ENG
- 💡 Crankshaft deflection on 8-cyl 410 mm: measure and document regularly — foundation condition is critical at this engine length
- 💡 HFO operation: a full fuel treatment plant is mandatory — Hanshin engines have the same cat fine sensitivity as other manufacturers
Related components
Classification & regulatory
IMO Tier II. MARPOL Annex VI. On international voyages: ECA compliance.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 28
Components & Design
Component data being added…
Technical Data
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