GEAR-FUEL PUMP 7W4637 - Caterpillar

Ignition System
The engine is equipped with an Electronic Ignition System (EIS). The EIS provides dependable firing and low maintenance. The EIS provides precise control of the following factors:
Spark voltage
Spark duration
Ignition timingThe EIS also provides diagnostic capability that enhances troubleshooting. The primary ignition wiring is routed internally through the engine.The engines are equipped with protection from detonation. The detonation sensors are mounted on each side of the cylinder block. The ignition timing is delayed when excessive detonation is sensed. If detonation continues after full retardation, then the engine control module (ECM) shuts down the engine.Lubrication System
The engine lubrication oil is supplied by a gear-driven pump. The oil is cooled and the oil is filtered. A bypass valve provides unrestricted flow of lubrication oil to the engine parts if the oil filter elements become plugged. The bypass valve will open if the oil filter differential pressure reaches 276 kPa (40 psi).Cooling System
The standard cooling system has a gear-driven centrifugal pump. Four temperature regulators regulate the temperature of the coolant.The turbocharged engine has a Separate Circuit Aftercooler (SCAC). The aftercooler is required to operate at one of the following three temperatures. The temperature depends on the engine rating and the application.
32 °C (90 °F)
54 °C (129 °F)
70 °C (158 °F)For cogeneration applications, energy from the engine heat is used in addition to the electrical energy that is generated. In a cogeneration engine, the oil cooler is not in the jacket water circuit because the jacket water is too hot. The circuit for the oil cooler and the circuit for the aftercooler may be either a combined circuit or a separate circuit. In the combined system, the auxiliary pump circulates water through both the aftercooler and oil cooler cores. The combined system uses a thermostatic control to regulate the oil temperature. This system prevents overcooling.Jacket water for cogeneration can be supplied at temperatures up to 127 °C (260 °F). The customer must supply a pump for circulating the heated jacket water. The temperature of the jacket water is controlled by the customer.For engines that use landfill gas, the jacket water coolant temperature is maintained at approximately 110 °C (230 °F). This temperature depends on the design of the cooling system and the ambient conditions. This temperature is required to prevent condensation of the water vapor that is in the fumes of the crankcase. Condensation of the water enables acids to form. Acids are more likely to form if the fuel contains contaminants such as chlorides, fluorides, and halides. Acids can damage internal parts of the engine.For engines that use landfill gas, the coolant that is supplied to the aftercooler is maintained at a temperature of 54 °C (129 °F). This temperature prevents condensation of moisture in the inlet air piping.Engine Specifications
Table 1
Engine Specifications
Item G3516B
EPG
Engine G3520B
EPG
Engine G3520B
Petroleum
Engine
Cylinders and arrangement 60 degree V 16 60 degree V 20
Bore 170 mm (6.7 inch)
Stroke 190 mm (7.5 inch)
Total displacement 69 L (4210 in 3) 86.2 L (5262 in 3)
Compression ratio 11.7:1 11.3:1