Caterpillar C7.1-ME425 Marine Main Engine
The CAT C7.1-ME425 marine main engine is an I-6, 4-Stroke-Cycle-Diesel engine with a 105 mm (4.13 in) bore, 135.0 mm (5.31 in) stroke and 7.01 L (428 in³) displacement. Lube oil system with replaceable oil filter: 20 L (5.3 gal) with common rail fuel system, heat exchanger or keel cooling and electronic (A5E2 V2 ECM) governor.The CAT C7.1- ME425 marine main engine is rated at 2700 RPM and rated at 425 bhp (317 bkW).
CAT C7.1- ME ME425 marine main engine complies with US EPA Tier 3/IMO II emission certification (commercial), RCD 2016, EU Stage IIIA emission standard, CCNR Stage II standard by following EU Stage IIIA standard, air intake is turbocharged After cooling.As part of EMAC, CAT Marine also offers high performance propulsion and handling solutions.
Advantages of Cat C7.1-ME425 Marine Main Engine
It is synchronized with Cummins’ advanced design and sophistiCaterpillared manufacturing, adapts to harsh working conditions, and has high-intensity and heavy-duty work capabilities.
The Holset wastegate valve makes the low speed performance more perfect and the power performance better.
Holset supercharger with integrated wastegate valve, low speed response and strong power.
Using forged steel camshaft and crankshaft, high-strength cylinder design, many parts are cast on the cylinder, with high rigidity, high pressure resistance, good reliability and longer service life.
The cylinder liner adopts a platform mesh honing design, which effectively prevents oil leakage with a perfect geometric structure, and adopts advanced technology such as new piston ring components and gasket crimping molding to reduce oil loss.
The cylinder block and cylinder head adopt integrated design to prevent the occurrence of engine water and oil leakage. The parts are 40% less than other similar engines, and the failure rate is greatly reduced.
Technical Specifications
Basic Introduction of Caterpillar C7.1-ME425 Marine Main Engine
| Engine Model: | C7.1-ME425 |
| Engine Type: | I-6, 4-Stroke-Cycle-Diesel |
| Displacement: | 7.01 L |
| Rated Speed: | 2300 RPM |
| Aspiration Method: | Turbocharged-Aftercooled |
| Emission Standard: | IMO II |
| Bore*Storke: | 105 mm (4.13 in)*135 mm (5.31 in) |
| Packing Size(L*W*H): | 1095 mm * 798 mm * 876 mm |
| Weight , Net Dry: | 760 kg (1676 lb) |
| Lead Time: | 15-30 Working Days |
| Payment Terms: | T/T ,L/C |
Engine Model | Rated Speed | Aspiration | Fuel system type |
| C7.1-ME280 | 209 bkW (280 BHP) @ 2300 RPM | Turbocharged-Aftercooled | Common Rail |
| C7.1-ME350 | 261 bkW (350 BHP) @ 2500 RPM | Turbocharged-Aftercooled | Common Rail |
| C7.1-ME400 | 298 bkW (400 BHP) @ 2600 RPM | Turbocharged-Aftercooled | Common Rail |
| C7.1-ME425 | 317 bkW (425 BHP) @ 2700 RPM | Turbocharged-Aftercooled | Common Rail |
| ——END—— | |||
General Engine Specifications of CAT C7.1-ME425 Marine Main Engine | |||
| Basic Engine Specifications | I-6, 4-Stroke-Cycle-Diesel | Governor | ECU |
| Displacement | 7.01 L (428 in³) | Fuel System Type | Common Rail |
| Rated Engine Speed | 2700 RPM | Length | 1095 mm (43.1 in) |
| Target Speed at Sea Trial | Rated Speed +/- 2% RPM | Width | 798 mm (31.4 in) |
| High Idle Speed | Rated Speed +10% RPM | Height | 876 mm (34.5 in) |
| Low Idle Speed (Programmable) | 600-800 RPM | Weight, Net Dry (Approx) | 760 kg (1676 lb) |
| Aspiration | Turbocharged-Aftercooled | Rotation (From Flywheel End) | Counterclockwise |
| Bore | 105 mm (4.13 in) | Flywheel Housing | SAE No. 03 |
| Stroke | 135 mm (5.31 in) | Flywheel | SAE 11.5” with 126 Teeth |
| Peak Torque | 1382 Nm @ 1900 RPM (317 bkW) | 1019 ft-lb @ 1900 RPM (425 HP) | |
Tolerances of CAT C7.1-ME425 Marine Main Engine | |||
| Power | +/- 3 % | Exhaust Flow | +/- 6 % |
| Exhaust Stack Temperature | +/- 8 % | Specific Fuel Consumption | +/- 3 % |
| Inlet Air Flow | +/- 5 % | Heat Rejection | +/- 5 % |
| Intake Manifold Pressure | +/- 10 % | Fuel Rate | +/- 5 % |
Emission Compliance of CAT C7.1-ME425 Marine Main Engine | |||
| Recreational | EPA Tier 3 (E3 Cycle) | Commercial | EPA Tier 3 (E3 Cycle) |
| IMO II (EPA, GL, CCS) | IMO II (EPA, GL, CCS) | ||
| Recreational Craft Directive (EU) RCD 2016 | |||
| –—–END—— | |||
System of CAT C7.1-ME425 Marine Main Engine | ||
| Air System | Combustion Air Inlet System | |
| Intake Combustion Air Flow | 24.2 m³/min (317 bkW) | |
| Intake Combustion Air Flow | 853.7 cfm (425 HP) | |
| Intake Combustion Air Temperature up to | 50 °C (122 °F) | |
| Max. Allowable Intake Air Restriction | 6.5 kPa (26 in H2O) | |
| Engine Room Ventilation Air | ||
| Heat Rejection to Atmosphere | 9.8 kW (317 bkW) @ 25 °C Ambient Temperature | |
| Heat Rejection to Atmosphere | 556 BTU/min (425 HP) @ 77 °F Ambient Temperature | |
| Fuel System | Fuel Flow Supply Line (Max) | 270 L/hr (71.3 gal/hr) |
| Fuel Flow Return Line (Max) | 270 L/hr (71.3 gal/hr) | |
| Fuel Rate At Rated Speed | 86.5 L/hr (317 bkW) | |
| Fuel Rate At Rated Speed | 22.9 gal/hr (425 HP) | |
| Total Fuel Supply Restriction (Max) | 30 kPa (8.9 in Hg) (4.4 PSI) | |
| Fuel Restriction Across Primary Fuel Filter (Clean) | 3.5 kPa (1.0 in Hg) (0.5 PSI) | |
| Fuel Temperature Engine Inlet (Max) | 60 °C (140 °F) | |
| Fuel Return Line Restriction (Max) | 37 kPa (10.9 in Hg) (5.4 PSI) | |
| Fuel Supply/Return Connection | 3/4″-16 SAE J514 (-8), 37° FLARE 13/16”-16 STOR (Optional) | |
| Minimum Fuel Supply Line Inside Diameter | SAE -8 (12.7 mm) (1/2 in) | |
| Primary Fuel Filter Inlet/Outlet Connection | 3/4″-16 SAE J514 (-8), 37 °F LARE | |
| Diesel Fuel Grade | US Diesel #2 / EN590 / Biodiesel 20 % Max | |
| Exhaust System | Exhaust Gas Flow (Total) | 1741 kg/hr (317 bkW) |
| Exhaust Gas Flow (Total) | 3839 lb/hr (425 HP) | |
| Exhaust Stack Temperature | 476 °C (317 bkW) | |
| Exhaust Stack Temperature | 888 °F (450 HP) | |
| Max. Allowable System Backpressure | 15 kPa (60.2 in H2O) | |
| Max. Allowable Static Weight on Turbine Outlet | 0 kg (0 lb) | |
| Max. Allowable Static Bending Moment on Turbine Outlet | 0 Nm (0 ft-lbs) | |
| Lube System | Sump Type | Center Sump |
| Sump Capacity | 20 L (5.3 gal) | |
| Oil Change Interval | 500 hr | |
| Max. Installation Angle (Fore-Aft) | 10 degrees | |
| Max. Operating Angle (Fore-Aft) | 20 degrees | |
| Max. Operating Angle (Athwart Ship) | 30 degrees | |
| Quality Diesel Engine Oil (Min) | CI-4 10W30 or 15W40 | |
| Starting System | Electrical Starting Motor | 24 VDC, 12 VDC |
| Cold Starting | 520 CCA (24 VDC), 520 CCA (12 VDC) [at -5 °C (23 °F) Ambient Temperature] | |
| Recommended Battery Capacity | 2×100 Ah, Series (24 VDC), 2×100 Ah, Parallel (12 VDC) | |
| ——END—— | ||
Cooling System of CAT C7.1-ME425 Marine Main Engine | ||
| HTC Cooling Water System (Engine Jacket Water) | Heat Rejection to HTC Cooling Water System | 239 kW (317 bkW) |
| Heat Rejection to HTC Cooling Water System | 13595 BTU/min (425 HP) | |
| Flow HTC Cooling Water Pump (Nominal) | 59.1 kW (317 bkW) | |
| Flow HTC Cooling Water Pump (Nominal) | 98.9 gal/min (425 HP) | |
| HTC Cooling Water Temperature Engine Out (Max) | 92 °C (203 °F) | |
| HTC Cooling Water Refill Capacity (Keel Cooled Only) | 38 L (10 gal) | |
| Coolant Medium | Cat Extended Life Coolant (ELC) or Equal. 50% Glycol | |
| Expansion Tank Pressure Cap | 50 kPa (7.25 PSI) | |
| HTC Cooling Water Connection Engine Inlet | 57 mm (2.25 in) OD | |
| HTC Cooling Water Connection Engine Outlet | 57 mm (2.25 in) OD | |
| LTC Cooling Water System (Aftercooler) | Heat Rejection to HTC Cooling Water System | 59.1 kW (317 bkW) |
| Heat Rejection to HTC Cooling Water System | 3359 BTU/min (425 HP) | |
| Flow HTC Cooling Water Pump (Nominal) | 210 L/min (317 bkW) | |
| Flow HTC Cooling Water Pump (Nominal) | 46.2 gal/min (425 HP) | |
| Ltc Water Temperature Engine In (27°C Sea) | 44 °C (317 bkW) | |
| Ltc Water Temperature Engine In (81°F Sea) | 111 °F (425 HP) | |
| Ltc Cooling Water Refill Capacity | 5 L (1.3 gal) Engine Only | |
| Coolant Medium | Cat Extended Life Coolant (ELC) or Equal. 50% Glycol. | |
| Expansion Tank Pressure Cap | 50 kPa (7.25 PSI) | |
| Ltc Cooling Water Connection Engine Inlet (138) | 45 mm (1.75 in) OD | |
| Ltc Cooling Water Connection Engine Outlet (139) | 45 mm (1.75 in) OD | |
| Raw Water Cooling System (SWAC) | Cooling Water Refill Capacity | 43 L (11.4 gal) |
| Coolant Medium | Cat Extended Life Coolant (ELC) or Equal. 50% Glycol | |
| Expansion Tank Pressure Cap | 100 kPa (14.5 PSI) | |
| Heat Rejection to Raw Water Cooling System | 295 kW (317 bkW) | |
| Heat Rejection to Raw Water Cooling System | 16722 BTU/min (425 HP) | |
| Flow Raw Water Pump (Nominal) | 210 L/min (317 bkW) | |
| Flow Raw Water Pump (Nominal) | 46.2 gal/min (425 HP) | |
| Raw Water Pump Maximum Inlet Restriction | 2.0 m (6.6 ft) H2O | |
| Raw Water Temperature Engine Out to Gear Oil Cooler (27°C Sea) | 47.1 °C (317 bkW) | |
| Raw Water Temperature Engine Out to Gear Oil Cooler (81°F Sea) | 116.8 °F (425 HP) | |
| Gear Oil Cooler 473-0282 Heat Rejection Capability | 11.2 kW (636.9 BTU/min) | |
| Raw Water Connection Engine Inlet | 50.8 mm (2.00 inch) SAE J1231 Hose Connection | |
| Raw Water Connection Engine Outlet | 45 mm (1.77 inch) SAE J1231 Hose Connection | |
| Sea Water Strainer Mesh Hole Diameter (Max) | 1.6 mm (0.063 in) | |
| ——END—— | ||
Standard of CAT C7.1-ME25 Marine Main Engine | |||
| Cooling System | 1. Gear Driven Jacket Pump | Fuel System | 1. Common Rail Fuel System |
| 2. Corrosion-Resistant Seawater Aftercooler | 2. Electric Fuel Priming Pump | ||
| 3. Fuel Cooler | |||
| Universal | 1. Shock Absorbers and Guards | Lubrication System | 1. Closed Crankcase Ventilation System |
| 2. Self-Tensioning Multi-V-Belt Drive | 2. Integrated Engine Oil Cooler | ||
| Install the System | 1. Front and Rear Engine Mounting Brackets | Starting System | 1. 12 V or 24 V Starter Motor |
| Exhaust System | 1. Water-Cooled Turbocharger and Exhaust Manifold | ||
| ——END—— | |||
Optional of CAT C7.1-ME425 Marine Main Engine | |||
| Air Intake System | 1. Various 6″ Water Cooled Exhaust Elbow Configurations | Fuel System | 1. SOLAS Double Wall High Pressure Fuel Line Kit |
| Lubrication System | 1. Left and Right Oil Dipsticks | Starting System | 1. Auxiliary Alternator Mounted on Engine – 24V 100A or 12V 175A |
| 2. Transmission Gear Oil Cooler (Installed Engine) | 2. Glow Plug | ||
| Cooling System | 1. Engine Mounted Bilge Pump and Auxiliary Water Pump with Electromagnetic Clutch | Protection System | 1. Additional Engine Transmission Sensor Kits for Monitoring Onboard or Offboard |
| 2. Tube Bundle Type Jacket Water Heat Exchanger and Gear Driven Sea Water Pump (Rubber Impeller) | 2. N/A | ||
| 3. Jacket Water Heater | 3. N/A | ||
| 4. Cab Heater (Heater) Connection | 4. N/A | ||
| ——END—— | |||
Modifiable of CAT C7.1-ME425 Marine Main Engine | |||
| Air Intake System | 1. Installation Position of Air Filter | Starting System | 1. 12V Starter Motor for 12V Electric System |
| 2. Upgrade to Heavy-Duty Type Air Fitler | 2. Upgrading to Specified Brand and Speicifications of Starter Motor | ||
| Exhuast System | 1. Can Modify Installation Position and Direction of Turbocharger | Charging System | 1. 12V Charging Alternator for 12V Electric System |
| 2. Water-Cooled Exhuast Manifold | 2. Explosion-Proof Charging Alternator | ||
| 3. Water-Cooled Turbocharger | 3. Upgrading to Specified Brand and Speicifications of Charging Alternator | ||
| Cooling System | 1. Can Modify Engine Into Keel Cooling System | Engine Auiliary Accessories | 1. Additional Auxiliary Systems Can Be Added for Special Applications |
| Lubricating System | 1. Oil Pan Position | Power Output System | 1. Can Modify Size of Flywheel Housing and Flywheel |
| 2. Number of Dipstick | 2. Dual-Ear Flywheel Housing (for Twin-Starter System) | ||
| 3. Position of Dipstick Can Choose From 6 Positions | 3. Some of Models Can Modify Flywheel Housing Into Pto Integrated Type | ||
| 4. Can Modify Oil Filter to Be Remote Installation | 4. Engine Have Connecting Port of Ptos, That Able to Provide Power Output | ||
| Engine Mounting System | 1. Can Modify Engine Mouting Bracket | Fuel System | 1. Upgrade to Fuel Fitler That Integrated with Fuel Transfer Pump and Fuel Pre-Hearter |
| ——END—— | |||
Note: All Above Data are Just for Reference, All Data Might Change Without Notices or Updates, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.
Engine Sale Manual
Installation Drawing
Installation Manual
Operation Manual
Parts Catalogue
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