Unit Five Regular Maintenance And Instruments,Task1 Packaging of Accessories,paragraph,Packaging of accessories A car is a single product, but it is composed of nearly 20,000 accessories. If anyone of these parts breaks down, the car will “fall sick”. It will generate more noise and consume more fuel, less comfortable. At worse, it will be dangerous if the braking system get some trouble. So, spare parts are needed. In a 4S dealer, one of the four “S” is “Spare parts”. If one part of a car gets broken, the driver could go to a 4S dealer, and get his car repaired. The workers in 4S dealer could replace the broken part with a new one. So the car will be in a good condition in a short time. So a 4S dealer will store a lot of spare parts, considering the requirement of the customers. In that case, there are so many accessories in the storehouse. How does the worker in the Spare Part Storehouse find the needed part as quickly as possible?,The answer is: although there are so many parts, all the spare parts are numbered in a sequence when they were packaged. According to the picture above, we can find that the “air filter” is numbered as “16546-ED500-C418”. When the air filter was transported into the storehouse, it was located in the right place. So workers in the storehouse could find it soon. The whole process is similar to the books being stored in the library. Although there are huge numbers of books in the library, we can find one book without much trouble. The precondition is the goods are placed in a reasonable rule. The numbers on the package make it convenient to find a certain part. If you work a long time in Spare Part Storehouse, you will find the part needed with a very short time. No matter which part the worker wants, you could satisfy him as quickly as you can. One thing must be mentioned. Be careful that some parts are different. For example, please dont mistake the back lamp RH for the back lamp LH. Watch carefully when you are searching these kinds of parts.,Words & expressions accessory 附件, 零件, 附加物 sequence 顺序，次序 spare parts 备件 according to 根据 storehouse 仓库 precondition 前提，与处理 number 遍号码, 共计., 计入,Task 2 Tools,paragraph,Tools We have to depend on many different kinds tools in automobile repair，these tool could help us to know automobile condition. Here are some typical tools. Dial indicate Dial indicate is a linear measure tool, which is composed of precise rack-pinion gear. It can measures used not only the shape and position error but also small displacement in length. The round dial in the upper end of the dial indicate has 100 even graduations. Each graduation indicates that the measuring rod has remove 0.01 millimeter. And its measuring range is 0 3,0 5,0-10mm. Fig. 5-3 Dial indicate The dial indicator is relatively simply in structure, small in size, light in weight, with little inertia and great transmission ratio. Its transmission system is gear system,. Dial indicator adopts circle scale and has wide measuring range, not only can be applied to comparative measurement, but also to absolute measurement. Furthermore，their gauging tip can rotate in a certain angle in order to adapt for different directional measureme,Feeler Gauge Feeler gauge is a sort of instrument used to measure the gap length between two components. It looks like a knife with a lot of blades, which are different in thickness. But each blade has a number marked on it, indicating its own thickness. During the measuring, the gap is filled with one piece of blade or several ones together at the same time. The length of the gap will be measured, if we add up the figures marked on those blades filled in the gap. The blades are made of anti-wear metal or plastic. So that the measurement could be precise after long-term use. Vernier caliper Vernier caliper is kind of measuring instrument consisting of an L-shaped frame with a linear scale along its longer arm and an L-shaped sliding attachment with a vernier, used to read directly the dimension of an object represented by the separation between the inner or outer edges of the two shorter arms.,Micrometer Micrometer is a kind of linear measure tool according to accurate thread theory. It can apply to the measurement of outside diameter and thickness. When the movable quill turns 360o, the shaft will move 0.5mm. The circumference of quill is divided into 50 small even parts, then each part indicates 0.01mm (0.5/50). So it can measure a length of 0.01mm an least. If you want to abtain the length or thickness, you can follow the steps below: (1)read the graduation on immovable quill which is on the left of movable quill; so you get a reading A; (2)make one of the graduation in movable quill meet the zero reference line; then you get a reading B. (3) then adds the reading A and reading B. Torque spanner As we all known, a modern car is complicated. Its a high technology product. Each bolt or nut on it should be screwed down with a certain torque, in order