A hydramechanical governor controls the output of the fuel injection pump. The operator maintains the engine rpm. There is one fuel injection pump for each cylinder. The fuel injection pump meters the fuel and the fuel injection pump pumps the fuel. The high pressure gaseous fuel is pumped to the fuel injection nozzles. The automatic timing advance provides the best fuel injection timing over the full range of engine speeds.
An electronic governor is provided as standard equipment. The electronic governor works with the hydramechanical governor in order to provide isochronous speed control.
The fuel ratio control is located on the governor. The fuel ratio control restricts the fuel rack movement. Only the proper amount of fuel is allowed to be injected into the cylinders during acceleration. This minimizes exhaust smoke.
The engine is equipped with a fuel system protection group. The fuel system protection group discourages tampering with the fuel ratio control setting. Standard bolts have been replaced by tamper resistant bolts.
Inlet air is filtered by the air cleaner. The air is compressed by the turbocharger before the air enters the cylinders. The turbocharger is driven by the engine exhaust.
The cooling system consists of the following components:
- A gear-driven centrifugal pump
- One water temperature regulator which regulates the engine coolant temperature
- An oil cooler
- A radiator which incorporates a shunt system
The engine lubricating oil is cooled and the engine lubricating oil is filtered. The engine lubricating oil is supplied by a gear-driven pump. If the oil viscosity is high or if the oil cooler and oil filter elements become plugged, bypass valves provide unrestricted flow of lubrication oil to the engine.
Engine efficiency and engine performance depend on adherence to proper operation and maintenance recommendations. Use the recommended fuel, lubrication oil, and coolant. Special attention should be given to the air cleaner, to the fuel system, to the lubrication system, and to the cooling system maintenance. Refer to the Operation and Maintenance Manual, "Maintenance Interval Schedule" for more information on maintenance items.
Engine Specifications
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| Illustration 1 | g00768530 |
(A) Front of engine (B) Exhaust valves (C) Right side of the engine (D) Flywheel of the engine (E) Left side of the engine (F) Inlet valves (G) Cylinder number | |
Note: The front end of the engine is opposite the flywheel end of the engine. The left and the right side of the engine are determined from the flywheel end.
| 3304B Engine Specifications | |
| Cylinders and Arrangement | 4 cylinder in-line block |
| Bore | 121 mm (4.76 inch) |
| Stroke | 152 mm (6.0 inch) |
| Aspiration | Turbocharged |
| Displacement | 7.0 L (427 in3) |
| Firing Order | 1-3-4-2 |
| Rotation (flywheel end) | Counterclockwise |