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2024-12-30 08:09 本頁面
【正文】 have good viscosity at extremes of high and low temperature. Any mineral oil , by itself , does not have all there properties . Lubricatingoil manufactures therefore put a number of additives into the oil during the manufacturing process . An oil for severe service may have many additives , as follow s: (1) usually a viscosityindex improver。 (2) pourpoint depressants。 (3) oxidation inhibitors。 (4) corrosion inhibitors。 (5) rust inhibitors。 (6) foam inhibitor s。 (7) detergentdispersants。 (8) extremepressure agents. English Cooling System The purpose of the cooling system is to keep the engine at its most efficient operating temperature at all engine speeds and all driving conditions . A great deal of heat is prod uced in the engine by the burning of the airfuel mixture. Some of this heat escapes from the engine through the exha ust gases ( the hot gases left after the gasoline is burned ) . But enough remains in the engine to cause serious trouble unless removed by some other means . The cooling bybtem take care of this additional 第 3 頁 共 9 頁 heat. The cooling system is built into the engine . There are hollow spaces around each engine cylinder and bustion chamber . These hollow spaces are called w ater jackets , since they are filled with w ater . When the engine is running , the water takes heat from the engine , being hot in the process . A water pump pumps the hot w ater from the engine w ater jackets into the radiator . The radiator has tw o sets of passages . One set carries water . The other set carries aie ( pulled thrugh b y car motionand the engine fan ) . As the hot w ater passes through ,it gives up its heat to the air passing through . The cooled w ater then reenters the engine , w here it can pick up more heat . In operation , water continuously circulates between the engine and radiator , carrying heat form the engine to the radiator . By this means , excessive engine temperatures are prevented. Two general types of cooling systems are used , air cooling and liquid cooling . Most automotive engines now employ liquid cooling . The liquid cooling system consists of water pumps , w ater jackets , engine fan , radiator and so on . Th
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