Main Engine 4-Stroke · Main Engines (4-Stroke)
The ABC 6DZC is a six‑cylinder, medium‑speed marine diesel main engine designed for ship propulsion, featuring a 256 mm bore and 310 mm stroke with dual‑fuel capability (MDO/HFO).
What our service work and the manufacturer documentation say about keeping this model running.
Service includes injector and valve overhaul, crankcase inspection and turbocharger cleaning per ABC schedule.
| Injector overhaul | 2,000 - 4,000 running hours |
|---|---|
| Exhaust valve overhaul/inspection | 4,000 - 8,000 running hours (often with cylinder head overhaul) |
| Crankcase inspection | 2,000 - 4,000 running hours (or as per oil analysis) |
| Turbocharger cleaning (full overhaul) | 2,000 - 4,000 running hours (water washing more frequent) |
| Lubricating oil change | 500 - 1,000 running hours (depending on oil analysis and operating conditions) |
| Major overhaul (top end - cylinder heads, pistons) | 12,000 - 18,000 running hours |
| Major overhaul (bottom end - bearings, crankshaft inspection) | 24,000 - 36,000 running hours |
| Cylinder liner wear | Max 0.6 - 0.8 mm (at top ring reversal point) |
|---|---|
| Piston ring end gap | Max 1.5 - 2.0 mm (for top compression ring) |
| Crankshaft deflection | Max 0.05 - 0.08 mm (between adjacent webs, measured cold) |
| Main bearing clearance | Max 0.30 - 0.40 mm |
| Connecting rod bearing clearance | Max 0.25 - 0.35 mm |
| Exhaust valve seat recession | Max 1.0 - 1.5 mm (from original position) |
| Turbocharger rotor axial play | Max 0.15 - 0.25 mm |
| Turbocharger rotor radial play | Max 0.30 - 0.50 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on the engine's overall condition, safety systems, and compliance with statutory regulations. Key checks include: verification of all safety devices (overspeed trip, low LO pressure, high CW temp, etc.) via functional test; inspection of crankcase relief valves and flame traps for condition and proper sealing; examination of the fuel oil system, including high-pressure lines, leak-off arrangements, and fire insulation; inspection of exhaust gas piping, insulation, and expansion bellows for leaks and integrity; review of engine maintenance records, including running hours, oil analysis, and major overhauls; visual inspection of engine foundation, mounting, and general condition for signs of distress or poor maintenance; and confirmation of proper operation of starting air system and emergency stop. A load test may be required to demonstrate engine performance and stability under various operating conditions.
Estimated lifetime: 60,000 - 90,000 hours (before major crankshaft-out overhaul, assuming diligent maintenance and operation)
Keep injectors, exhaust valves, piston rings, gasket kits, filters and turbocharger spares.
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