The floorboard of automobile maintenance and repair. It is to find out the cause of the fault through technical means and take certain measures to eliminate the fault and restore it to a certain performance and safety standard. Automobile maintenance includes automobile overhaul and automobile minor repair. Automobile overhaul refers to the restorative repair to restore the intact technical condition of the automobile and completely (or nearly completely) restore its service life by repairing or replacing any parts (including basic parts) of the automobile.

2 Tools/raw materials

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What tools do you need for car maintenance?

(1) Spark plug sleeve Spark plug sleeve is used to remove the engine spark plug. The inner hexagon socket of the sleeve is used for folding 14 mm and 18 mm spark plugs, with a relative size of 22 ~ 26mm；; The inner hexagon of the sleeve is 17mm on the opposite side, which is used to fold the spark plug of 10mm.

(2) Piston ring pliers Piston ring pliers are used for loading and unloading engine piston rings to avoid piston rings from being broken due to uneven stress. When in use, clamp the piston ring at the opening of the piston ring, gently hold the handle, slowly shrink the piston ring, and slowly open the piston ring, and install the piston ring into or take it out of the piston ring groove.

(3) Valve spring operating pliers Valve spring operating pliers are used to operate the valve spring. When in use, retract the jaw to the minimum position, insert it under the valve spring retainer, and then turn the handle. Press the left palm forward hard to make the lower jaw close to the spring seat. After assembling and disassembling the valve key (pin), rotate the valve spring assembling and disassembling handle in the opposite direction and take out the assembling and disassembling pliers.

(IV) Grease gun Grease gun is used for filling grease at all lubricating points, and consists of nozzle, oil pressure valve, plunger, oil inlet hole, rod head, lever, spring and piston rod. When using the grease gun, divide the grease into groups and put them into the oil storage barrel to exclude air. After decoration, tighten the end cover and use it. When adding grease to the nozzle, the nozzle should be straight and not skewed. If there is no oil supply, stop oil supply and check whether the nozzle is blocked.

(5) Jack includes screw jack, hydraulic jack and hydraulic elevator. Hydraulic jacks are usually used in automobiles. The lifting force of jack is 3 tons, 5 tons, 8 tons, etc. Hydraulic jacks are used to lift cars and other heavy objects. Its structure consists of a top block, a screw, an oil storage barrel, an oil cylinder, a crank, an oil pressing plunger, a plunger barrel, an oil inlet and outlet valve, an oil valve, a plug and a shell. Before using the jack, use triangular wood to pad the car; When used on soft pavement, stow wood should be added under the jack; When lifting, the jack should be vertically aligned with the heavy object; It is forbidden to work under the car before and when the heavy objects are not firmly supported. When using the jack, first tighten the switch, put the jack away, aim at the jacked part, press the handle and jack the heavy object. When putting down the jack, slowly release the switch, and the weight will gradually drop.