5LH41L
The Hanshin 5LH41L is a compact 5‑cylinder medium‑speed 2‑stroke diesel main engine delivering up to 3 500 kW at 500 rpm, intended for coastal and feeder vessels where space is limited.
Engine Specifications
Inspector Detail
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Designation decoded
5 for 5 cylinders, LH for L-type H variant, 41 for 410 mm bore, L suffix for long-stroke. Specs: stroke 550 mm. Hanshin EL series — largest engine of the EL line.
Background
The 5LH41L, with a 410 mm bore, is the largest engine of the Hanshin EL series. With a 550 mm stroke (S/B 1.34) it offers the highest output in the Hanshin small-engine portfolio. Used on the largest coastal freighters and small international merchant ships that use Hanshin engines.
Calculated metrics
Inspector checklist
- Cylinder liner: 410 mm bore, 550 mm stroke — largest EL engine, wear measurement
- Piston rings: Hanshin configuration
- Crosshead bearing: largest Hanshin bearing — bearing clearance per manual
- Camshaft: largest Hanshin cams
- Fuel pumps: largest Hanshin plungers
- Valve clearance: Hanshin manual
- Injection nozzles: condition
- Fuel: possibly HFO on larger ships — is a separator plant fitted?
- Stuffing box: drainage
- Exhaust valve: mechanical
- Turbocharger: 1× — 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 → injection problem |
| Scavenge Air Pressure | 1.3-2.2 bar abs at MCR | Turbocharger |
| Engine speed | 160-280 rpm | Load/governor |
Common Failure Modes
Expert tips
- 💡 5LH41L is the largest Hanshin engine: on international voyages HFO operation may be required — a separator plant and fuel treatment system must be fitted and functional
- 💡 Hanshin limit: above a 410 mm bore, Japanese yards typically switch to J-ENG UEC, MAN or WinGD-licensed engines
- 💡 S/B 1.34: fast-running character — assess maintenance intervals on a cycle basis
Related components
Classification & regulatory
IMO Tier II. Japanese JG classification. On international voyages: MARPOL Annex VI 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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