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Hudong-Zhonghua

6G80ME-C9.5

Name: Hudong-Zhonghua 6G80ME-C9.5
Brand: Hudong-Zhonghua
SKU: OSE-67571

The Hudong‑Zhonghua 6G80ME‑C9.5 is a low‑speed, 6‑cylinder inline, electronically controlled two‑stroke main engine (800 mm bore × 4000 mm stroke) delivering high power at 58 rpm for large ocean vessels.

26400.0 kW

Power

Engine Specifications

Cylinders

800 mm

Bore

4000 mm

Stroke

Inspector Detail ✓ verified

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Common issues

Hydraulic Power Supply (HPS) unit malfunctions (pump wear, filter clogging, control valve issues) affecting fuel injection and exhaust valve operation.
Fuel oil booster/injection valve issues (sticking, leakage, poor atomization) leading to incomplete combustion and increased wear.
Exhaust valve spindle burning or sticking, particularly with varying fuel qualities or inadequate cooling/lubrication.
Cylinder liner wear and scuffing, exacerbated by cold corrosion (low load operation with high sulfur fuel) or poor lubrication.
Turbocharger bearing failures or fouling, impacting engine efficiency and exhaust gas temperatures.
ME-C control system sensor or actuator failures, leading to erratic engine behavior or alarms.
Crosshead bearing wear due to high loads, lube oil contamination, or insufficient oil film.

Inspection checklist

Crankcase inspection: Check for abnormal oil mist, bearing condition (visual if possible), cleanliness, and presence of debris. Verify oil mist detector functionality.
Cylinder head area: Inspect fuel valves for leaks, exhaust valve actuators for hydraulic leaks, and cooling water connections for integrity. Check for signs of blow-by.
Hydraulic Power Supply (HPS) unit: Verify system pressures and temperatures, check for leaks, inspect filter condition, and listen for abnormal pump noises.
Turbocharger: Check bearing play (axial/radial), inspect compressor and turbine blades for fouling/damage, and verify air filter condition.
Fuel oil system: Inspect high-pressure fuel lines for leaks, check fuel filter differential pressures, and verify fuel oil temperatures and pressures.
Exhaust gas system: Inspect exhaust manifold, expansion bellows, and economizer for leaks, corrosion, and structural integrity.
Engine parameters: Review logbook trends for temperatures, pressures, speeds, and fuel consumption. Compare current readings against normal operating ranges.
Safety devices: Verify functionality of overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, and emergency stops.
Foundation bolts and chocking: Visually inspect for tightness, corrosion, and signs of movement or fretting.

Service intervals

Fuel valves (inspection/overhaul)	3,000 - 6,000 hours
Exhaust valves (inspection/overhaul)	6,000 - 12,000 hours (depending on fuel and operation)
Piston overhaul (ring renewal, crown inspection)	12,000 - 18,000 hours
Cylinder liner inspection	12,000 - 18,000 hours
Turbocharger overhaul (minor)	12,000 - 24,000 hours
Turbocharger overhaul (major)	36,000 - 48,000 hours
Crosshead bearing inspection	18,000 - 24,000 hours
Main bearing inspection	24,000 - 36,000 hours
HPS pump overhaul	12,000 - 18,000 hours

Typical wear limits

Cylinder liner (max ovality)	0.6 - 0.8 mm
Cylinder liner (max taper)	0.8 - 1.2 mm (over full stroke)
Piston ring groove (max side clearance for top ring)	0.2 - 0.3 mm
Crosshead bearing (max radial clearance)	0.4 - 0.6 mm
Main bearing (max radial clearance)	0.3 - 0.4 mm
Exhaust valve seat (max wear depth)	2 - 3 mm (or specific angle deviation as per manual)
Crankshaft deflection (max between adjacent webs)	0.05 - 0.10 mm

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

Fuel valve complete unit or critical components (nozzles, springs, O-rings).
Exhaust valve spindle and seat ring (or complete unit).
Piston rings (at least one complete set per cylinder).
Cylinder head gasket/sealing rings.
HPS pump elements, seals, and control valves.
Critical sensors for ME-C system (e.g., speed, pressure, temperature, position sensors).
Turbocharger bearing cartridge or complete bearing assembly.
Assorted O-rings, gaskets, and seals for fuel, lube oil, and cooling water systems.

Safety

High-pressure fuel lines: Risk of spray fires (up to 1000 bar injection pressure) from leaks or ruptures.
Hot surfaces: Exhaust manifold, turbocharger, cylinder heads, and steam lines pose severe burn risks.
Rotating machinery: Crankshaft, flywheel, and turbocharger present entanglement and impact hazards.
Confined spaces: Crankcase entry requires strict procedures due to potential for oxygen deficiency, oil mist, and high temperatures.
High voltage/electronics: ME-C control system components and associated power supplies carry electrical shock risks.

Class survey

Class surveyors typically focus on the structural integrity and operational safety of the engine. Key checks include: crankcase internal inspection (for bearing condition, oil mist detector functionality, and general cleanliness); testing of all safety devices (overspeed trip, low lube oil pressure, high cooling water temperature, emergency stops); inspection of the exhaust gas system (manifold, expansion bellows, turbocharger, economizer for leaks and corrosion); verification of fuel oil system integrity (high-pressure lines, leak detection, filters); review of engine maintenance logs, lube oil analysis reports, and alarm logs; and visual inspection of foundation bolts and chocking. For continuous survey arrangements, specific cylinder units may be opened for piston and liner inspection.

Estimated lifetime: 150,000 - 210,000 hours (before major overhaul, with regular maintenance)