Main Engine 4-Stroke · Main Engines (4-Stroke)
Marine engineers and operators rely on reliable and efficient diesel engines to ensure smooth operations and prolonged service life at sea. One such dependable workhorse is the Mitsubishi S16R-MPTA, designed for heavy-duty marine applications. This engine is a high-speed 4-stroke diesel unit with a bore and stroke of 170 mm × 180 mm, providing a displacement of 65.37 liters and a dry weight of 7,000 kg. It can operate on both diesel and MGO, offering versatile fuel options. The S16R-MPTA is available as part of a genset configuration and is certified for IMO Tier 2 and 3 emissions standards as well as EU Stage 5. Regular maintenance, including oil sampling, filter changes, and checks on injectors and turbochargers, is essential for optimal performance and longevity. Common issues such as piston ring wear, turbocharger damage, and air cooler corrosion should be monitored to prevent failures and maintain efficiency.
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What our service work and the manufacturer documentation say about keeping this model running.
Scheduled service includes oil sampling, filters, valve clearance, injectors, aftercooler and turbocharger checks.
| Engine oil change | 250-500 hours (based on oil analysis and duty cycle) |
|---|---|
| Oil filter replacement | 250-500 hours (with oil change) |
| Fuel filter replacement | 250-500 hours (or as indicated by pressure drop) |
| Valve clearance adjustment | 1000-2000 hours |
| Injector overhaul/replacement | 2000-4000 hours |
| Turbocharger inspection/cleaning | 2000-4000 hours (depending on exhaust condition and performance) |
| Charge air cooler cleaning | 2000-4000 hours (or as indicated by pressure drop/temperature difference) |
| Top-end overhaul (cylinder heads, pistons, liners) | 8000-12000 hours |
| Major overhaul (crankshaft, main/con-rod bearings) | 15000-25000 hours |
| Cylinder Liner Wear | Max taper/ovality typically 0.6-0.8 mm (measured at top ring reversal point). |
|---|---|
| Piston Ring Gap | Max increase 1.0-1.5 mm over new specification (check manufacturer's manual for exact values). |
| Crankshaft Deflection | Max deviation between adjacent webs typically 0.03-0.05 mm (cold engine). |
| Main/Connecting Rod Bearing Clearance | Max increase 0.10-0.15 mm over new specification. |
| Valve Seat Recession | Max 0.5-1.0 mm from cylinder head face (check manufacturer's manual for exact values). |
| Turbocharger Rotor Shaft Play | Axial play 0.10-0.20 mm, Radial play 0.20-0.40 mm (specific to turbocharger model, refer to manual). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on: 1. Safety Devices: Verification of overspeed trip, low lube oil pressure, high cooling water temperature, and low/high fuel pressure alarms and shutdowns. 2. Fuel System Integrity: Inspection for leaks, proper shielding of high-pressure lines, condition of fuel filters, and emergency shut-off arrangements. 3. Exhaust System: Condition of exhaust manifold, turbocharger casing, exhaust piping, and silencer. Check for leaks and proper insulation. 4. Cooling System: Inspection of pumps, heat exchangers, piping, expansion tank, and temperature control valves. Check for leaks and proper operation. 5. Lubricating Oil System: Inspection of pumps, filters, coolers, and piping. Verification of oil analysis records and proper oil management. 6. Engine Foundations & Mountings: Check for cracks, loose bolts, and proper vibration isolation. 7. Governor & Control System: Verification of proper speed control, load sharing (if genset), and emergency stop functionality. 8. Documentation: Review of engine logbooks, maintenance records, oil analysis reports, and previous survey reports to ensure compliance and proper upkeep. 9. Fire Safety: Presence and condition of fire fighting equipment in the vicinity, proper lagging of hot surfaces, and overall cleanliness of engine spaces to mitigate fire risk.
Estimated lifetime: 15,000 - 25,000 hours before major overhaul (e.g., crankshaft bearings, piston/liner replacement)
Maintain filters, injectors, sensors, belts, water pump kit and turbocharger parts.
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