I have a maintenance internship in xx Co., Ltd. In the past month or so, I have provided equipment for the automobile maintenance service station, such as a lift, a tire dynamic balancer, a body straightening frame, a painting room and so on. I also have conservative export detection instruments, such as x43 1 computer detector and ignition tester. And the computer network used in the maintenance business.
First of all, practice means
After the implementation of 1., Mr. Wang deepened his understanding of the position and role of automobile specialty in the national economy, consolidated his professional thinking and stimulated his enthusiasm for continuing learning.
2. Understand the current situation of Shandong automobile service market.
3. Familiar with the automobile maintenance environment and maintenance tools. Lay the foundation for future tasks.
4. Confirm, deepen, consolidate and enrich the theoretical knowledge learned through the on-site maintenance practice and exchange guidance of enterprise employees, cultivate the ability to analyze and deal with actual engineering achievements, and lay a solid foundation for subsequent professional knowledge learning, curriculum assumption and graduation assumption.
5. Maintenance practice is an exercise for Mr. Wang's analytical ability. In the whole practice process, I fully mobilized the teacher's objective initiative, deepened careful observation and theory, and improved my practical ability.
Second, the internship content:
This company not only has a group of high-quality and skilled automobile maintenance technicians, but also buys a group of conservative automobile maintenance testing equipment from home and abroad. For example: computer detection analyzer, fuel injection cleaning analyzer, four-wheel locator, atf active cycle cleaning, etc. The software and hardware of the factory are perfect.
There is a perfect maintenance service process, which is as follows:
(1) automobile maintenance
Car maintenance is very important. To buy a new car, you must first know how to maintain it. Several tasks to be done in automobile maintenance;
Clean the car surface and check whether the door and window glass, wiper, indoor mirror, rearview mirror, door lock and lifter handle are completely effective. Check whether the water quantity of the radiator, the oil quantity of the crankcase, the oil storage quantity of the oil tank and the electrolyte level in the battery meet the requirements. Check whether the horn and lighting are complete and effective, and whether the installation is firm. Check whether the connecting parts of the steering mechanism are loose and firmly installed. Check whether the tire pressure is sufficient and remove impurities between the tire and the wheel track. Check whether the running clearance of the steering wheel meets the standard; Whether the hub bearing and steering knuckle kingpin are loose. Check whether the free distance between clutch and brake pedal meets the requirements.
Check whether the tire nut, axle bolt, leaf spring riding bolt and U-shaped bolt are firm and reliable. After starting the engine, observe whether the instrument task is normal and listen to whether the engine has abnormal sound. Check whether the vehicle has "four leaks" such as water leakage, oil leakage, air leakage and electric leakage. Check whether the towing installation task is reliable.
The main function of engine oil is to make the engine stable, cool, sealed, clean, rust-proof and anticorrosive ... Without engine oil, the heart of the car can't work normally. Use mineral oil and change the oil every 5000 kilometers. The correct oil change standard is calculated by "engine running time". (Self-estimated average speed: km/h) x (100h/mineral oil-200h/decomposed oil) = oil change kilometers.
Five steps to change automobile oil:
(1). Select the quality grade and viscosity grade of lubricating oil correctly.
(2) Select high-quality engine oil filter elements consumed by manufacturers on the right track to prevent oil blockage, insufficient pressure or poor filtering effect caused by the quality and performance of the filter elements from affecting the smooth effect.
(3) When changing oil, when the engine is at normal working temperature, turn off the engine, unscrew the oil filler cap, remove the oil drain screw to drain the old oil, and unscrew the old filter with common tools. If conditions permit, the engine should be cleaned, and the sludge and colloid in the engine should be thoroughly cleaned.
(4) When replacing a new filter element, check whether the sealing ring of the filter element is in good condition, and replace it in time if deformation or damage is found. When removing the filter element, the filter element should be filled with clean and smooth oil, and the sealing ring should be coated with smooth oil to prevent it from being protected during installation.
(5) After installing the oil filter element, tighten the oil drain screw and inject a certain amount of new lubricating oil into the engine crankcase as required. The dipstick and oil level should be between the high and low cutting lines. Install the dipstick and tighten the filler cap, and start the engine to rotate quickly for a few minutes to check whether the oil pressure is normal and whether there is oil leakage. If there is any abnormality, stop the machine in time to check and eliminate it. Never add too much or too little engine oil. Too much oil will lead to high fuel consumption, increased engine running resistance and increased fuel consumption. Too low oil pressure will cause too low and poor ride comfort.
In addition to changing the oil, it is also necessary to check whether the electronic control components of the car are normal with a computer detector. Check the engine oil level, engine coolant level, active transmission lubricating oil level, brake oil level (manual transmission lubricating oil, which is unnecessary due to different structures), power steering lubricating oil level and tire pressure. When it comes to tire pressure, many car owners see that the wheels are flat and think that the air pressure is insufficient, so they pump up the tires until they are not flat. Actually, this is not right. Excessive tire pressure leads to premature tire wear, and there is a great risk of tire puncture when driving on the expressway. Too low tire pressure is not good. It is best to follow the standards of each car, and you can check the instructions on the driver's door in the car manual.
Inspection and replacement of automobile brake fluid: Check the brake fluid after driving for a certain period of time and replace it if necessary. After a period of use, the brake fluid will have different degrees of boiling point reduction, purification and oxidation. Therefore, its quality and function should be checked in time according to climate, environmental conditions, seasonal changes and working conditions, so as to replace it in time. Under normal working conditions, the brake fluid should be replaced after 2 years or 50,000 kilometers. In principle, different types of brake fluid should not be mixed, so as to avoid chemical reaction between them and affect the braking effect. Different types of vehicles usually use different brake fluids. Brake fluid includes mineral oil brake fluid and decomposed brake fluid. Decomposition of brake fluid has many advantages and is widely used.
In addition, professional replacement equipment should be used when replacing brake fluid, so that brake fluid can be replaced more thoroughly without leaving impurities, preventing air resistance and effectively preventing the common achievements of replacing brake fluid in the field. For example, the brake is soft and the hydraulic (pneumatic) valve is protected.
1, Engine Spark Plug Replacement
Although there is no strict requirement for oil change in time and mileage. However, if the spark plug is not changed for a long time, it will also affect the task and life of the engine. Spark plugs are generally divided into two types, one is the ordinary type, and the service life of this spark plug is two years or 48 thousand kilometers. Another platinum spark plug, made of platinum, has a service life of120,000 kilometers or five years due to the paper web http://www. /.The spark plugs of most cars can be replaced by themselves, especially for four-cylinder engines. There are only two sizes of spark plugs for family cars all over the world. If you want to change the spark plug yourself, you can go to autoparts stores such as autozone or Auto Parts, report the age and model of your car, buy a spark plug that matches your car, and then borrow tools from your service classmates to change the spark plug.
2. Install the car.
The mechanic must remove the automobile engine, instrument panel, seat, axle and other parts with serious body deformation, and the body can be corrected by the sheet metal master before installation. When I was an intern, our group just installed a car. Above, I briefly describe its disassembly steps:
(1), fix the engine.
(2) The 2)v6 engine is fixedly connected to the frame with four bolts through the damping block. In order to prevent the frame from being deformed due to traffic accidents, there are many bolt holes on the frame, so that the engine can be properly fixed on the frame.
(3) Install the gear lever and other engine parts: After the engine is fixed, the gear lever can be connected to the engine gearbox. The clutch can also be fixed on the push rod of the conflict plate to connect the exhaust pipe at the bottom of the frame with the exhaust pipe of the engine.
Install the frame and safety bar.
(4) Install the engine, air conditioning louver and cooling oil pipe assembly on the gantry. Fix the gantry behind the engine and install the safety bar.
Install the air conditioner blower and steering booster pump.
Axle installation
(5) Fix the two ends of the left and right axle shafts driven by the front wheel on both sides of the wheel and the transfer case respectively (the left and right axle shafts of the manual gear can be interchanged, but the left and right axle shafts of the engine with the driving gear cannot be interchanged).
(6) Install the steering system
Install a steering main assembly around the frame, which is connected with the steering rod through a universal joint. First, adjust the steering wheel and fix it on the steering main assembly.
(7) Wiring
Nowadays, the more high-end cars, the more complicated the electronic control part, the more sensors and the more simple the circuit. During installation, special attention should be paid to its direction and the use of each wire harness. Otherwise, the harness will be too short or too long. This requires mechanics to be very familiar with the route of the car. Pay special attention to the size, hole position, color and other characteristics of the two jacks when connecting the patch cord. Because in order to reduce the labor difficulty of mechanics, the characteristics of different wire harnesses are different.
(8) Install the wiper assembly
When assembling the wiper assembly, the central control computer board should be disassembled first, otherwise it will be difficult to assemble due to insufficient space. For the car in trouble, it is necessary to adjust the two bolt holes for fixing the wiper on the frame, otherwise there will be abnormal noise when installing the wiper.
(9) Installation of instruments and task list
The circuit of the instrument assembly is an ancient integrated circuit, just plug it in. Air conditioning air volume control port, negative driver's airbag and bracket for fixing the workbench should be installed on the workbench.
(10) Install the battery and start the engine test run.
When installing the battery, the grounding wire bolt should be polished with sandpaper to make it conduct well. When installing the terminal, the positive electrode should be installed first, and then the negative electrode should be installed, so as to prevent people from being injured by careless grounding when installing the negative electrode and the positive electrode.
Add engine oil, steering oil, brake oil, coolant, air filter and gasoline before starting the engine, and check carefully before starting. After starting, check whether there are other faults with computer detector, and then debug.