Great performance before gearbox failure! Don't ignore it!

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Great performance before gearbox failure! Don't ignore it!

The two most important components of the car, one is the engine, the other is the gearbox. Either one of them is going to cost a fortune.

The problem of the engine is easier to detect, so how do we check the fault of the gearbox? We have to remember six words: big failure big performance!

Transmission leakage

Phenomenon: The start is laborious, especially when the gear is low, the speed of the accelerator is increased during the driving process, but the car does not accelerate.

Oil leakage causes: 1, scratched the chassis resulting in oil leakage of the gearbox, 2, due to the aging of the internal seal of the gearbox, the oil leakage caused by poor sealing.

Stop the gear engine

Phenomenon: After starting the car, when the P or N gear is changed into other gear, the engine is turned off. Or you hit the brakes while you're driving and the engine shuts down.

The cause of the failure: the locking solenoid valve may be damaged, or the locking control valve hair card is damaged.

Transmission lock

Phenomenon: The car is in normal driving, the refueling speed is very high, but the speed is very slow, and the brake speed is reduced to a certain extent. Change to manual found hanging in a gear can not lift the gear, that is, the transmission locked in a gear, no longer shift.

Fault cause: the input and output signals of the gearbox are incorrect, or the components themselves or the lines are bad, and sometimes there are problems with the communication between the gearbox computer and other system computers.

The car in gear won't move

Phenomenon: After the car starts, the gear is suspended in D or R gear, and the vehicle does not react after releasing the brake and does not move forward. Manual hanging 1 gear, loosen the clutch, the car does not run.

Cause of failure: The transmission input shaft or reverse gear clutch may be damaged, or the D/R brake is damaged. It can also be caused by a leak in the transmission, a serious lack of transmission fluid, or a loosening of the link or cable between the car shift lever and the manual valve rocker arm, causing the manual valve to remain in neutral or park gear.

Shift impact

Phenomenon: When the car is normal driving and shifting, the transient change of the powertrain torque transmission, resulting in vibration or noise induction in the car, is to feel bad when shifting, such as the car stops for a moment, and the stop rod shakes the hand.

Failure cause: May be the transmission oil is too dirty, resulting in the valve body stuck. Just replace the transmission oil.

Transmission abnormal noise

Phenomenon: In the process of driving to hear the transmission from the abnormal sound.

The cause of failure: wear and damage of bearings and variable speed components, or the low precision of replacement parts.

Shift too long or too short

Phenomenon: The general automatic transmission has a specific shift speed and speed, in the process of driving, it is found that the gear rises faster, which is directly reflected in the speed.

The cause of the failure: The gear ratio has a problem.

Transmission slip

Car phenomenon: In the process of driving, when refueling to hear the engine idling sound, the car speed without any improvement, feel weak acceleration.

Failure cause: the clutch disc is burned or the oil pressure is too low.

In addition, timely replacement of the appropriate transmission oil, so that the gearbox is always in a healthy state is particularly important, and the use of inferior oil or not according to the model of the oil change, more likely to lead to the "short life" of the gearbox.

However, before changing the oil, Xiaobang recommends first understanding the "basic two-step oil change" content.

① The transmission type is different, and the oil used is different

The transmission oil models of automatic transmission and manual transmission are different. To maintain, you must first understand the transmission type of your car.

② The type of transmission is different, and the oil change cycle is different

The transmission oil replacement cycle is based on the number of kilometers traveled or the use time, and if the maintenance manual gives these two indicators at the same time, generally whichever indicator comes first will be executed.

The maintenance manual doesn't give any indicators, what to do?

• Automatic transmission oil: It is recommended to change according to the mileage of 40,000-60,000 km or every two years.

• Manual transmission: recommended for 5 years or 100,000 kilometers for the first time, later every 60,000 kilometers to check and replace once, can be adjusted according to the specific driving environment.

In addition, if there is any situation in the above picture, it is recommended that you can give the gearbox a big health care before changing the oil.

That's all for today's knowledge. If there's anything you don't understand, you can discuss it in the comments section or in the background.