What maintenance does the new car need?

We have always stressed the importance of the user manual. This is the first step for you to know about cars. Although the arrangement of domestic user manual is not perfect at present, and the information provided can not fully meet the needs of car owners, it is still a guide for basic operation and maintenance. For example, engine model, engine oil capacity, gearbox oil capacity, cooling water capacity, spark plug specifications, valve clearance value, ignition timing angle, tire pressure under various loads, rim offset (Yulong seems to be the only manufacturer in domestic cars that provides offset in the user manual), and tightening torque of various screws. In addition, daily driving inspection items and methods and emergency treatment methods are also essential.

Step 2 check the condition of the car

You may think that the so-called new car means everything, ok, but it may not be the case. If you love your car as much as I do, and treat your car as a toy instead of a tool, please remove the engine oil and gearbox oil after the new car lands and replace it with a brand you are familiar with. If you buy a domestic car, you'd better change the brake oil to at least DOT-4 products. The employer has no doubt and the suspect has no doubt. Do you trust that this brand and unknown grade of oil will be left in your car? Maybe you will replace it with all the fever products you want in the future, but are you like most people, ignoring the "virgin period of new cars" where 0~ 1000Km is more important than the running-in period, because they all have the wrong idea that using inferior oil can make the running-in more thorough? In fact, this practice is likely to make you "go too far" and even cause irreparable losses. Our insistence is. In addition, whether the chassis screws are locked can not be ignored, especially for domestic cars. Too many car owners have such a painful experience. Another simplest and most easily overlooked item is "tire pressure". When the new car is delivered to you, more than 90% of the tire pressure is unqualified, not insufficient, but the tire pressure is too high. Excessive tire pressure will not only cause abnormal tire wear, reduce grip and comfort, but also increase the gap between moving parts of suspension system and accelerate the deterioration of shock absorber (know that more than 30% of vibration is absorbed by tire deformation). The reasonable tire pressure shall be reduced by 1~2psi according to the instructions. As the tire pressure changes with the temperature, it is suggested that you prepare a "high-grade" tire pressure gauge to match your famous car tires and keep the best tire pressure at any time. It is understood that Snap-On has a tire pressure gauge widely used by various teams on the track, and the price is quite reasonable.

3. Running in

Whether to run in or not has always been a matter of opinion. I once had the opportunity to visit the production line of Yulong Sany Factory. After assembly, there is an accuracy check of the code table in the test project. Only when the technician drives the car on the test roller table, the pointer has pointed to 170Km/h, running in? ! I bought a Macy a few years ago, and I went to the delivery center with great joy on the day of delivery. At the door, I saw a batch of new cars slowly sliding down from the trailer, squeaking ... full of charm, starting, turning, braking, stopping in the parking space accurately, running in? ! Even so, you need to run in. Only two principles need to be grasped when running in: stability and light load. If we can grasp these two principles, it is not so important to use high-quality engine oil and limit the speed and speed. Smooth throttle, smooth braking, smooth steering and shifting, and feel the load and operation of the engine with your heart. During the running-in period, no matter how fast or slow the vehicle speed is, it is necessary to avoid driving at a constant speed for a long time, so that each gear has enough running-in opportunities at various speeds, especially to avoid engine jitter under any circumstances. This is the taboo of running-in period. Self-propelled vehicles must step on the accelerator more gently to minimize the occurrence of downshifting, because the hydraulic impact in the hydraulic torque converter is great when downshifting, which will inevitably have a negative impact. The braking force should be the same as the engine torque curve of M3. It should be gradually increased for a period of time, then slightly released before the car stops, and finally gently stepped on it to ensure that the car does not slip. Good and sufficient running-in braking can avoid the sequelae of abnormal braking sound and disc deformation. Running-in is a painful bondage, but it is also a good opportunity to adjust driving style.

4. 1000 km maintenance

1000Km maintenance is the most important maintenance. Please choose a large-scale direct maintenance factory (leave maintenance records to ensure future warranty rights) and personally supervise the work. Here are some small details for your reference when supervising the work.

5. Change the oil

Please pay special attention when changing oil. When installing a new oil filter, will the mechanic rub some oil on the edge of the filter? This can prevent the rubber from twisting when tightening, resulting in poor sealing and oil leakage. In addition, when adding oil, it is ideal to add eight points to the scale of the oil meter.

6. Change the automatic transmission oil

When checking the liquid level after replacing ATF, be sure to confirm the oil temperature first, because usually the user manual requires that ATF be measured when it reaches the working temperature (50 ~ 80℃), so as to avoid the difference of liquid level height caused by different oil temperatures. In addition, the gear should stay in the N gear, and every gear should be played from the P gear and stay in each gear for more than two seconds before it is discharged to the N gear. When the liquid level is too high, a mechanic must be asked to pump out the excess ATF, because the natural enemy of the transmission efficiency of the torque converter of the automatic transmission is air bubbles, and both inferior ATF and excessive ATF will cause air bubbles, thus reducing the efficiency and causing adverse effects during downshifting. Therefore, when the sixth-generation Messi went on the market, it was particularly emphasized that the automatic gearbox was equipped with a device to reduce bubbles. If your car doesn't have this device, all you can do is keep the correct ATF level.

7. Adjust the valve clearance

If the valve clearance is too large, there will be abnormal noise; If it is too small, it is difficult to increase the speed. It must be adjusted to 1000Km, and it is best to use the "four-time adjustment method" to adjust. It should be adjusted when the car is cooled. Although some models provide the valve clearance value when the car is hot or cold, the definition of hot car is flexible, with great differences,100 c, 80°C, 60°C ... so it is better to adjust it when the car is cold. It may take 3-4 hours from entering the repair shop to completing the cooling. I think that's why the repair shop will convince you to accept the lie that "the new car doesn't need to adjust the valve clearance" for countless reasons. After all, it takes too long to wait for cooling.

8, check the ignition timing

Before checking the ignition timing, remove the spark plug and check the electrode condition to see if other spark plugs with different calorific values should be used. The abnormality of ignition timing is not easy to detect. Although the timing is too early, it will easily lead to knocking, too late, the output power of the engine will decrease and the fuel consumption will increase, but these are all comparison results, and the judgment standard is the timing angle provided by the original factory. At present, many vehicles are equipped with knock sensors, but for the long-term stability of the engine, it is recommended that you keep the angle specified by the original factory, and don't imagine that the engine condition can be greatly improved by advancing the ignition timing.

9. Confirm the free clearance between the steering wheel and each pedal.

The free clearance of the steering wheel is an important basis for judging whether the steering system is abnormal, so it is necessary to confirm that the free clearance of the steering wheel is within the standard value in this maintenance. The clearance between clutch, brake and accelerator pedal has an extremely important influence on the ride comfort of operation. For a platoon, the relationship between the brake and the accelerator pedal directly affects the following &; Tiptoe operation, the ideal state is that the pedal height is just flush with the accelerator pedal after stepping on the brake. And be careful not to let the accelerator pedal have too long "empty window period", which is especially important for automatic transmission, because for opponents, the accelerator pedal only controls the throttle, while automatic transmission controls the throttle and throttle sensor at the same time. The throttle sensor is an important parameter of automatic transmission shift, that is to say, the free clearance of the accelerator pedal will affect the downshift response and shift timing of automatic transmission.

10, pay attention to the tightening torque of screws.

For a long time, people have neglected the tightness of nuts and bolts. The unit of measurement is torque value: Kg-m, and the tool used is "torque wrench". It seems that apart from the racecourse, it is rare to see a torque wrench used in a repair shop. The complete user manual should clearly specify the torque required for tightening common nuts and bolts. Take the domestic Thunder as an example: the torque required to tighten the tire nut is10 ~12kg-m; The oil drain bolt needs 3 ~ 4 kg-m; Spark plugs need 2 ~ 3 kg-m, and with a clear torque value, you don't have to worry about the screw breaking and you don't have to be a victim of a pneumatic wrench.

1 1. Other articles in the engine room

Everyone is familiar with the inspection items of the engine room, so I won't go into details here. I just remind you, don't put too much oil in the power steering wheel, so as not to overflow during intense driving. Then there is the tightness of the timing belt. Too loose will cause jitter during acceleration and deceleration, and too loose will increase the loss of the belt and even cause fracture. The standard of belt tightness must refer to the technical manual of the repair shop, and the general manual usually does not provide information.

12, positioning and tires

It is understood that the car factory will not do accurate four-wheel positioning for new cars (there seems to be no locator on the production line), so it is absolutely worthwhile to do an accurate positioning, which can not only ensure maneuverability, but also avoid abnormal wear and tear of tires and steering systems. When positioning, you can also check the tire pressure and the tightness of the fixing screws between the tire and the chassis, especially the aluminum alloy wheels. Finally, check the running-in of the brake disc, so as to know whether the action of the brake caliper is normal and whether the braking skills are correct. If the CD is uneven and abnormal, prepare to claim for compensation.

13, persevere and maintain regularly.

After completing the above steps at 1000Km, your car should be in the best condition, so please clearly record the car condition at this time as a reference and judgment standard when there are abnormal situations in the future. And please don't forget to extend this work to regular maintenance every 5000 kilometers; Check carefully at ordinary times and drive daily, please feel carefully. If you find any abnormality, please seek a solution immediately, even if it is subtle, especially the problems during the warranty period, so as to avoid crying in the future.