- Four-stroke cycle
- Mechanical fuel system
- Direct fuel injection
- Six in-line cylinders
- Two valves per head
- Turbocharged aftercooling
A hydramechanical governor controls the output of the fuel injector. The governor maintains the selected engine rpm. Individual fuel injectors (one per cylinder) meter fuel and individual fuel injectors pump fuel under high pressure through the fuel injector nozzles to the cylinders.
The fuel ratio control is located on the governor. The fuel ratio control restricts the fuel rack movement. In order to minimize exhaust smoke, only the proper amount of fuel is injected into the cylinders during acceleration.
The inlet air is filtered by an air cleaner. The air is compressed by a turbocharger before the air enters the engine cylinders. The turbocharger is driven by engine exhaust.
Note: The front end of the engine is opposite the flywheel end of the engine. The number one cylinder is the front cylinder.
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| Illustration 1 | g00513382 |
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Cylinder and valve locations (A) Exhaust valve (B) Inlet valve | |
| 3116 Marine Engine Specifications | |
| Number of Cylinders | 6 In-Line Cylinders |
| Bore | |
| Stroke | |
| Aspiration | Turbocharged Aftercooled |
| Compression Ratio | 16:1 |
| Displacement | |
| Firing Order | 1-5-3-6-2-4 |
| Rotation (viewed from flywheel) | Counterclockwise |
| 3126 Marine Engine Specifications | |
| Number of Cylinders | 6 In-Line Cylinders |
| Bore | |
| Stroke | |
| Aspiration | Turbocharged Aftercooled |
| Compression Ratio | 15:1 |
| Displacement | |
| Firing Order | 1-5-3-6-2-4 |
| Rotation (viewed from flywheel) | Counterclockwise |
The cooling system consists of the following components:
- Gear-driven centrifugal pump
- One water temperature regulator which regulates the engine coolant temperature
- Engine oil cooler
- Transmission oil cooler
- Water-cooled exhaust manifold
- Auxiliary sea water pump
- Expansion tank
- Heat exchanger
The engine lubricating oil, that is supplied by a gear type pump, is cooled. The engine lubricating oil is also filtered. Bypass valves provide unrestricted flow of lubrication oil to the engine components during the following conditions:
- High oil viscosity
- Plugged oil cooler or plugged oil filter elements (paper cartridge)
Engine efficiency and maximum utilization of engine performance depend on the adherence to proper operation and maintenance recommendations. In addition, use recommended fuels, coolants, and lubricants. Use the Operation and Maintenance Manual as a guide for required engine maintenance.
Expected engine life is generally predicted by the average power demand, which is based on fuel consumption of the engine over a time. Reduced hours of operation at full throttle and/or operating at reduced throttle settings result in a lower average power demand. The lower average power demand will increase the length of operating time before an engine overhaul is required. Refer to the Operation and Maintenance Manual, "Overhaul Considerations" topic for more information.