Main Engine 4-Stroke · Main Engines (4-Stroke)
The HiMSEN 9H35/40 engine operates on the principle of internal combustion, utilizing a diesel fuel source to generate power. This nine-cylinder, large bore engine boasts a "L" configuration, with a bore of 350 mm and a stroke of 400 mm. It is designed to operate at a speed of 720 rpm and delivers a power output of 5040 kW, making it a robust choice for demanding maritime applications. The 9H35/40 engine utilizes Common Rail Tier II technology, ensuring efficient combustion and emission control. It is capable of running on both Heavy Fuel Oil (HFO) and Marine Gas Oil (MGO), providing operational flexibility. The engine's specifications include a compression ratio of 17:1 and a maximum combustion pressure of 200 bar. The 9H35/40 is equipped with Enhanced Miller timing for NOx compliance, contributing to its environmental performance.
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| Cylinder unit overhaul (piston, liner, valves) | 8,000 - 12,000 running hours |
|---|---|
| Fuel injector overhaul/replacement | 3,000 - 6,000 running hours |
| Exhaust valve overhaul/replacement | 6,000 - 10,000 running hours |
| Turbocharger major overhaul | 12,000 - 18,000 running hours |
| Main and big end bearing inspection | 24,000 - 36,000 running hours |
| Major engine overhaul (incl. crankshaft inspection) | 48,000 - 72,000 running hours |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner wear (max ovality/taper) | 0.6 - 0.8 mm |
|---|---|
| Piston ring groove wear (increase in height) | 0.15 - 0.20 mm |
| Exhaust valve seat recession | 1.0 - 1.5 mm |
| Crankshaft deflection (max deviation between adjacent webs) | 0.05 - 0.08 mm |
| Main/Big end bearing clearance (max increase from new) | 0.20 - 0.30 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will typically focus on verifying maintenance records and logbooks, confirming compliance with IMO Tier II (as per specs) and Type Approval conditions. Key checks include crankshaft deflection, cylinder pressure equalization (indicator diagrams), functionality of all safety devices (overspeed, emergency stops, alarms), integrity of high-pressure fuel lines, lubricating oil system performance (including oil analysis reports), and general engine room condition. They will also inspect the engine's structural integrity, foundation bolts, and exhaust gas system for leaks. Verification of spare parts inventory and crew competency for engine operation and emergency procedures is also common.
Estimated lifetime: 80,000 - 120,000 running hours before major engine rebuild (e.g., crankshaft removal)
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