Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN V28/33D STC is a medium‑speed, four‑stroke marine diesel main engine delivering up to about 455 kW per cylinder at 1 000 rpm, distinguished by its high specific power and low specific fuel consumption.
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What our service work and the manufacturer documentation say about keeping this model running.
Servicing per the manufacturer's manual and classification society requirements. Annual inspection at class survey. Stock spare parts as specified by the manufacturer.
| Minor Service (filters, general check) | 250-500 running hours |
|---|---|
| Fuel Injector Overhaul | 3,000-6,000 running hours |
| Exhaust Valve Overhaul/Replacement | 4,000-8,000 running hours |
| Piston Overhaul (rings, crown inspection) | 8,000-12,000 running hours |
| Cylinder Liner Inspection/Measurement | 8,000-12,000 running hours |
| Turbocharger Overhaul | 8,000-16,000 running hours (depending on type and service) |
| Connecting Rod Bearing Inspection | 12,000-18,000 running hours |
| Main Bearing Inspection | 24,000-36,000 running hours |
| Major Overhaul (crankshaft out) | 80,000-120,000 running hours (condition-based) |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder Liner Wear (max taper/ovality) | 0.6 - 0.8 mm |
|---|---|
| Piston Ring Groove Wear (clearance increase) | 0.15 - 0.2 mm |
| Crankshaft Deflection (max deviation between adjacent webs) | 0.05 - 0.10 mm (depending on engine size) |
| Exhaust Valve Seat Recession | 0.5 - 1.0 mm (from new position) |
| Main/Connecting Rod Bearing Clearances | Manufacturer specific, typically 0.15 - 0.30 mm over nominal |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will verify adherence to planned maintenance system (PMS) and manufacturer's service intervals. Key checks include operational tests of safety devices (overspeed, low oil pressure, high temperature shutdowns), visual inspection for leaks, damage, and proper securing of components. They will review engine logbooks, lube oil analysis reports, and confirm the presence and condition of critical spare parts. Specific surveys (e.g., crankcase inspection, main bearing inspection) will be conducted as per the classification society's survey cycle, typically at 5-year intervals with intermediate checks.
Estimated lifetime: 80,000 - 120,000 hours (before major crankshaft overhaul, with proper intermediate overhauls)
Spare parts via MAN Energy Solutions SE or authorised distribution partners. Lead time: 2-6 weeks.
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