Since the day of buying a car, maintenance and repairs have become a "worry" for all car owners. The editor usually receives questions from car owners about the replacement of engine oil and transmission oil. The most common question is: Should I change the gearbox oil after driving xx kilometers? Should the oil change when the gearbox is frustrated? What brand of oil is the best?
For the maintenance of gearboxes, there is indeed a lot of specious popularization of knowledge on the Internet, but it is really difficult to find the ones that can really talk thoroughly. There are even many straightforward, one-size-fits-all, all gearboxes use the same oil change interval. This kind of non-rigorous or even offensive content floods the Internet. Many car owners have spent money and damaged the gearbox.
Then the editor has checked a lot of information in the past two days, combined with a gearbox repair example, to talk about these things about gearbox maintenance.
The gearbox is maintenance-free for life?
If you don't pay attention to maintenance, you can only replace it!
First of all, in the car owners circle, the most common and most confusing is the definition of the so-called "lifelong maintenance-free" gearbox. If you ask the car owner now whether to maintain the automatic transmission, most people will ask: Is the automatic transmission not maintenance-free for life? This is the first reaction of most car owners.
Whether it is BMW or Jaguar Land Rover, they like to claim that their gearbox is maintenance-free (about 160,000 kilometers), but the official ZF (ZF) gearbox they use has given a completely different answer ：
translates as follows:
In the case of high working temperature, it will accelerate the gearbox oil aging
often driving at speeds above 120km/h, For example, the road conditions of the unrestricted highway in Germany
often tow the carriage
often in intense driving
According to driving habits and road conditions, ZF recommends that owners change gears for 80,000 to 120,000 kilometers. Tank oil (time period: up to 8 years must be replaced)
In fact, it can be seen from ZF's official statement that most car owners do not experience the first three driving situations. There are electronic police everywhere in the country, with penalty points and fines, so the oil change interval of 80,000 to 120,000 kilometers can be appropriately extended. Even if the gearbox can not change the oil for a long time, you will soon find that your car has problems such as slow downshift, frustration, jitter, and abnormal noise when driving.
If you continue to drive like this, you can indeed say-(until) the gearbox (before it is scrapped) does not require maintenance. If it is scrapped, isn't it a lifetime? Although it is not the end of life, it is estimated that the warranty period has passed. This responsibility is not the responsibility of the car manufacturer anyway, tusk tusk. Feel deceived?
There are clear proper nouns for this routine, right! "Planned obsolescence", this "automatic gearbox is maintenance-free for life" is similar.
So, want to extend the service life of the gearbox of your car? Let's do maintenance for the automatic gearbox honestly!
The gearbox also needs maintenance
The oil change interval must be understood!
To judge the working condition of the gearbox, the most intuitive thing is the shift speed and the texture when shifting. The editor found that this Volkswagen’s “ancestral” Aisin 09G 6AT gearbox not only has a very slow downshift response, but also has obvious frustrations and instantaneous stalls in the second gear up to the third gear. This situation is not a normal aging situation at all.
It is necessary to check carefully what is the situation of this mentally retarded shift logic.
After inspection, this seven-year-old little Polo has some corrosion on the ingot beam and some slight oil leakage from the engine oil pan. The gearbox is clean but covered with a layer of dust. But due to the strange shift logic of the gearbox, the editor decided to remove the entire oil pan and use the most originalThe original gravity oil change method is used to check the entire gearbox. After the technician disassembled the transmission oil drain screw and the oil spill gauge, the editor specially received a small cup of the entire transmission oil.
The next step is to remove the oil pan, clean and replace the strainer. Basically, the dirtiest side of the gearbox can be displayed in front of you. The filter of the gearbox valve body has basically been covered in black by the ground metal powder, and the oil pan is also a thick layer of sludge and metal powder mixture.
After checking, simply clean and replace the repair kit parts, first use chemical cleaning to clean the oil pan, and install a new one after completion For the valve body filter, install a new oil sump sealing strip and you can perform oil change operations.
I will not shoot one by one in the next steps, mainly 6 steps:
(1) Add to the gas port Transmission oil, until the oil level hole starts to discharge evenly, stop refueling, and screw on the oil level hole bolt.
(2) Start the engine, shift gears sequentially from reverse gear, hold each gear for 30 seconds, turn off the engine, and stand still for 2 minutes.
(3) Open the oil level hole and the oil filling hole and continue to add oil until the oil level hole starts to discharge evenly.
(4) Repeat steps (1)-(3) twice.
(5) Tighten the oil filler bolt and the oil level hole bolt.
(6) Finish refueling and hit the road. After the test, return to the store to check the fuel level again.
After the last oil change, the editor can obviously feel that the 2-3 gear, which was originally severely frustrated, has become very smooth on the way home. Finally, remind everyone that the gearbox still needs to pay more attention to maintenance. Especially some gearboxes have a fixed oil change interval. For the specific oil change interval of each model, please refer to Vehicle Maintenance Manual and maintenance suggestions of technicians.
