Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN L32/44CR is a medium‑speed, trunk‑piston diesel engine with common‑rail fuel injection, delivering 3 000–7 200 kW at 720–750 rpm and meeting IMO Tier II (with optional Tier III SCR) emissions standards.
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What our service work and the manufacturer documentation say about keeping this model running.
CR Injector: 6,000-8,000 hrs. Piston: 16,000-20,000 hrs. Head: 20,000-28,000 hrs. Turbocharger: 10,000-14,000 hrs.
| CR Injector Overhaul/Replacement | 6,000-8,000 hrs |
|---|---|
| Piston Overhaul/Inspection | 16,000-20,000 hrs |
| Cylinder Head Overhaul/Inspection | 20,000-28,000 hrs |
| Turbocharger Overhaul/Inspection | 10,000-14,000 hrs |
| Lube Oil Change | Based on oil analysis, typically 1,000-2,000 hrs for HFO operation, longer for MGO/MDO. |
| Fuel Filter Element Replacement | 500-1,000 hrs or based on differential pressure. |
| Cylinder Liner Wear | Max. 0.6-0.8 mm total ovality/taper, or 0.1-0.15 mm/1000 hrs. |
|---|---|
| Piston Ring Groove Wear | Max. 0.15-0.20 mm increase in axial clearance over new. |
| Crankshaft Deflection | Max. 0.05-0.10 mm (depending on manufacturer's specific limits and engine size). |
| Main/Connecting Rod Bearing Clearance | Max. 0.15-0.30 mm increase over new specification. |
| Exhaust Valve Seat Recession | Max. 0.8-1.0 mm from original position. |
| Turbocharger Rotor Axial/Radial Play | Manufacturer specific, typically 0.05-0.15 mm axial, 0.1-0.2 mm radial. |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on: review of engine logbooks, maintenance records, and lube/fuel oil analysis reports; verification of safety devices (overspeed trip, low lube oil pressure shutdown, high cooling water temp shutdown, oil mist detector, emergency stops); inspection of crankcase for bearing condition and crankshaft deflection (if required); assessment of cylinder head and liner condition (if opened for maintenance); integrity of high-pressure fuel lines and shielding; exhaust system insulation and expansion bellows; general condition of turbocharger and its safety devices; foundation bolt tightness; and compliance with IMO Tier II/III NOx emissions requirements.
Estimated lifetime: 80,000 - 120,000 hours before major overhaul (e.g., crankshaft out, full engine rebuild), assuming diligent maintenance and operation.
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