ENGINE 273 MPFI 163 ENGINE GENERAL DESCRIPTION The primary job of the cooling system is to maintain the ideal engine working temperature and avoid overheating. The engine performs best at specific designated temperature. When the engine is cold, components wear out faster, and the engine is less efficient and emits more pollution. So another important job of the cooling system is to allow the engine to heat up as quickly as possible, and then to keep the engine at a ideal constant working temperature. Inside a engine, fuel is constantly burning. A lot of the heat from this combustion goes right out the exhaust system, but some of it soaks into the engine, heating it up. The engine runs best when its coolant is about 200º F (93º C). At this temperature: • The combustion chamber is hot enough to completely vaporize the fuel, providing better combustion and reducing emissions. • The oil used to lubricate the engine has a lower viscosity (it is thinner), so the engine parts move more freely and the engine wastes less power moving its own components around. • Minimize wear and tear of engine parts. The cooling system circulates a fluid through pipes and passageways in the engine. As this liquid passes through the hot engine it absorbs heat, cooling the engine. After the fluid leaves the engine, it passes through a heat exchanger, or radiator, which transfers the heat from the fluid to the air blowing through the exchanger. The water pump sends the fluid into the engine block, where it makes its way through passages in the engine around the cylinders. Then it returns through thecylinder head of the engine. The thermostat is located where the fluid leaves the engine. The plumbing around the thermostat sends the fluid back to the pump directly if the thermostat is closed. If it is open, the fluid goes through the radiator first and then back to the pump. There is also a separate circuit for the heating system. This circuit takes fluid from the cylinder head and passes it through a heater core and then back to the pump. SYSTEM SCHEMATICS 1. Radiator 2. Water Pump 3. Cylinder Block 4. Heater Coil 5.Outlet Elbow 6.Cylinder Head 7.Thermostat
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