Basics Of Automobile

Thermostat ensures that a cold engine warms up faster

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Unformatted text preview: m tank and pushes the water in to the engine block/cylinder head. Water pump is driven by the engine crankshaft by a belt (in some cases it may be gear driven) 2. THERMOSTAT - Thermostat is a temperature sensitive valve fitted on the outlet of the engine. The thermostat will open only when the predetermined temperature (75-90 C) is reached. Thermostat ensures that a cold engine warms up faster and also ensures engine runs at optimum temperature for best fuel efficiency. 2.RADIATOR - Radiator is a heat exchanger. The hot coolant (water) from engine enters to the top tank of the radiator and passes through the core to the bottom tank of the radiator. Cool atmospheric air is drawn over the core by the cooling fan, leading to cooling of the radiator water. Radiators can be of : Down Flow type - Water passes from top tank to bottom tank in a downward direction. Cross Flow type - Water passes from left to right across the radiator. Radiators can be made of Copper or Aluminum COOLING SYSTEM 4. RADIATOR PRESSURE CAP - Water normally starts boiling at 100 deg C. In order to increase the boiling temperature of water, the cooling system is pressurized. The Radiator pressure cap is set at 0.9 Bar so that the cooling system operates under a pressure of 1.9 Bar. When the pressure exceeds 1.9 Bar, the pressure valve opens and lets out the excessive pressure along with some coolant. When the engine cools down , the vacuum valve opens and let in air so that the radiator does not collapse inwards due to vacuum. 5. COOLING FAN - Cooling fan sucks in fresh cool air through the radiator, thus cooling the hot water. Cooling fan can be of 3 types based on how it is driven & controlled. MECHANICAL FAN - Is driven by the engine crankshaft by a belt. Cooling fan speed is dependent on engine speed. VISCOUS FAN(Scorpio - Diesel) - Is driven by the engine by a belt. However, the speed of the fan is controlled by a viscous clutch based on the radiator temperature. ELECTRIC FAN(Scorpio - Petrol)- Is driven by an electric motor. The motor is controlled by a controller based on various parameters like engine temperature, engine speed, A/c operation etc. COOLING SYSTEM 6. OIL COOLER - Oil cooler is a heat exchanger which uses coolant to cool the engine oil. The hot engine oil is passed through the inside of the oil cooler and a relatively cool coolant flows on the outside. ENGINE COOLANT HOT ENGINE OIL OIL COOLER COOLER ENGINE OIL SAMPLE LEAFLET Engine3.exe MARSHAL 2000 ENGINE TYPE BORE/STROKE CUBIC CAPACITY MAX POWER MAX TORQUE FUEL INJ SYSTEM COMPRESSION RATIO WEIGHT COOLING SYSTEM : MDI 3200 L ; DIRECT INJECTION DIESEL : 4 STROKE, 4 CYLINDER, INLINE : 88.9 mm/101.6 mm : 2523 cc : 58 HP @ 3200 RPM : 16.55 Kg-m @ 1500 RPM : INLINE : 18 : 1 : 260 Kg : BELT DRIVEN PUMP ON CYLINDER HEAD THERMOSTAT CONTROLLED SYSTEMS IN AN AUTOMOBILE A. POWER TRAIN SYSTEM • POWER PLANT (POWER GENERATION - ENGINE) • ENGINE • FUEL SYSTEM • INTAKE SYSTEM • EXHAUST SYSTEM • COOLING SYSTEM • DRIVE LINE (POWER TRANSMISSION ) • CLUTCH • GEAR BOX/TRANSMISSION • TRANSFER CASE • DIFFERENTIAL • WHEELS/TYRES B. RUNNING SYSTEM • SUSPENSION • STEERING • BRAKING C. COMFORT SYSTEM • HVAC/AC/HEATER SYSTEM • SEATING/UPHOLSTRY/FACIA/INSTRUMENTS • AUDIO/VIDEO/GPS ANATOMY OF AN...
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