Main Engine 4-Stroke · Main Engines (4-Stroke)
The HiMSEN 16H46DF is a 16‑cylinder, inline 4‑stroke main propulsion engine delivering about 18 320 kW at 500 rpm, capable of running on both LNG and heavy fuel oil.
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| Cylinder unit overhaul (piston, liner, exhaust valve) | 12,000 - 18,000 hours (condition-based, depending on fuel usage) |
|---|---|
| Exhaust valve overhaul | 6,000 - 9,000 hours (can be shorter if predominantly HFO operation) |
| HFO Fuel Injector overhaul | 3,000 - 6,000 hours |
| Pilot Fuel Injector overhaul | 3,000 - 6,000 hours |
| Gas Admission Valve inspection/overhaul | 6,000 - 9,000 hours |
| Turbocharger minor overhaul (bearings, cleaning) | 12,000 - 18,000 hours |
| Turbocharger major overhaul | 24,000 - 36,000 hours |
| Connecting rod bearing inspection | 12,000 - 18,000 hours |
| Main bearing inspection | 24,000 - 36,000 hours |
| Lubricating oil analysis | Monthly or every 250-500 running hours |
| Cylinder liner wear (max ovality/taper) | 0.6 - 0.8 mm at top ring reversal point (consult OEM manual for exact H46DF value) |
|---|---|
| Piston ring groove wear (max clearance increase) | 0.15 - 0.20 mm |
| Exhaust valve seat recession | Max 1.0 - 1.5 mm into cylinder head |
| Crankshaft deflection (max deviation) | 0.05 - 0.10 mm (across adjacent throws) |
| Main/Connecting rod bearing clearance (max increase from new) | 0.10 - 0.15 mm |
| Turbocharger rotor axial play | 0.10 - 0.20 mm (specific to TC model) |
| Turbocharger rotor radial play | 0.30 - 0.50 mm (specific to TC model) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on verifying the engine's overall condition, maintenance history, and the functionality of critical safety and control systems. Key checks include: review of logbooks, maintenance records, oil analysis reports, and class certificates; functional testing of overspeed trip, low lube oil pressure trip, high cooling water temperature trip, and crankcase oil mist detector; thorough inspection of the gas fuel system for leaks, proper ventilation, and gas detection system calibration; visual inspection for general cleanliness, leaks, and securing of components; review of recent engine performance data; and often, a crankshaft deflection measurement. Verification of critical spare parts inventory and fire fighting arrangements in the engine room are also standard.
Estimated lifetime: 100,000 - 150,000 hours before major overhaul (e.g., crankshaft regrinding, block line boring), with proper maintenance and component replacement.
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