1106D-E70TAG Marine Generator Engine
The Perkins 1106D‑E70TAG is a medium‑speed, inline‑six diesel engine designed to drive auxiliary generators on merchant vessels, delivering reliable electrical power at 1500 rpm and 50 Hz.
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Common issues
- Injector wear causing hard starting and increased fuel consumption
- Turbocharger fouling leading to reduced power output and black smoke
- Cooling system scaling, particularly in heat exchanger, causing overheating
- Fuel system contamination (water, microbial growth) leading to filter blockage and poor running
- Alternator issues (voltage regulation failure, bearing wear, belt slippage)
- Engine mount degradation causing excessive vibration and potential alignment issues
- Exhaust gas leaks from manifold or turbocharger connections
- Raw water pump impeller wear, leading to insufficient cooling
Inspection checklist
- Check all fluid levels (engine oil, coolant) and condition (color, clarity, presence of water/fuel)
- Inspect for any leaks (oil, fuel, coolant, exhaust gas) around the engine and associated piping
- Observe exhaust gas color and temperature during operation (should be clear/light haze, not black/white/blue)
- Monitor engine gauges during operation: oil pressure (should be stable, within spec), coolant temperature (stable, within spec), RPM, and load
- Listen for unusual noises (knocking, grinding, whistling) and feel for excessive vibration
- Inspect fuel system components: filters for cleanliness, lines for chafing/leaks, water separator for water accumulation
- Check cooling system: hoses for cracks/softness, heat exchanger for external fouling, raw water strainer for debris, pump for leaks
- Verify condition and tension of all drive belts (alternator, raw water pump)
- Inspect electrical connections for corrosion, tightness, and insulation integrity
- Test emergency stop and safety shutdown systems (low oil pressure, high coolant temperature, overspeed) if safe and practical
Service intervals
| Engine Oil & Filter Change | 250-500 hours or annually, whichever comes first |
| Fuel Filter Change (Primary & Secondary) | 250-500 hours or annually, whichever comes first |
| Valve Clearance Inspection/Adjustment | 1000-2000 hours |
| Air Filter Inspection/Replacement | 500-1000 hours or as needed based on operating environment |
| Cooling System Flush & Inhibitor Change | 2000-4000 hours or every 2-3 years |
| Raw Water Pump Impeller Replacement | 500-1000 hours or annually, whichever comes first |
| Drive Belt Inspection/Replacement | 1000-2000 hours or as needed |
Typical wear limits
| Turbocharger Shaft Play | Axial play: Max 0.15-0.20 mm; Radial play: Max 0.30-0.40 mm (check against manufacturer's specific limits) |
| Engine Mount Degradation | Visual inspection for cracks, excessive compression/sag, or oil contamination. Replace if visibly compromised. |
| Drive Belt Tension | Check deflection as per manufacturer's specification (typically 10-15mm deflection with moderate thumb pressure) |
| Coolant pH Level | Maintain within manufacturer's specified range, typically 8.0-9.5 for inhibited coolants. |
| Lubricating Oil TBN (Total Base Number) | Should not drop below 50% of new oil TBN or manufacturer's specified minimum limit (e.g., 3-4 mg KOH/g for this engine type). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Full set of fuel filters (primary and secondary)
- Engine oil filters
- Raw water pump impeller and gasket kit
- Drive belts (alternator, raw water pump)
- Spare injectors (at least one, given known failure mode)
- Air filter element
- Assorted O-rings and gaskets for common leak points (e.g., fuel lines, cooling system)
- Starter motor solenoid or complete starter motor (common failure point)
Safety
- Hot surfaces: Exhaust manifold, turbocharger, and exhaust piping can cause severe burns.
- Rotating machinery: Belts, pulleys, and flywheel pose entanglement hazards.
- Fuel leaks: High-pressure fuel leaks are a fire hazard and can cause skin penetration injuries.
- Electrical hazards: Live terminals and wiring, especially during maintenance or inspection.
- Exhaust gas: Risk of carbon monoxide poisoning in enclosed spaces if exhaust system leaks.
Class survey
A class surveyor will typically focus on the engine's overall condition, operational reliability, and compliance with safety regulations. Key checks include: Operational test under load to verify stable running, correct parameters (oil pressure, coolant temp, RPM, load), and absence of excessive smoke/vibration. Verification of all safety devices (overspeed trip, low oil pressure shutdown, high coolant temperature shutdown) functionality. Inspection of fuel system integrity (piping, shut-off valves, fire protection). Examination of exhaust system integrity (no leaks, proper insulation). Assessment of cooling system components (seawater lines, heat exchanger, pumps) for leaks or corrosion. Inspection of engine mounting arrangements and foundations for integrity. Review of engine logbook entries, service records, and recent load test reports. Confirmation of emergency stop functionality from all designated locations. Verification of fire fighting arrangements in the machinery space.
Components & Design
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Technical Data
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Common failures & inspection points
Service & Maintenance
Routine service includes oil and filter change, fuel filter change, valve clearance inspection and cooling system checks according to Perkins schedule.
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