What is the reason for the abnormal noise when hanging the third gear?

There is an abnormal sound in the gearbox.

Symptom description: If there is a "rustle" sound inside the gearbox while the car is driving, and the clutch is pressed.

Or there is no more after the throttle, and there will be a whistle-like sound when changing gears.

The solution: transmission.

There are many parts, and the reasons for the sound are more complex, so it should be noted in the analysis and judgment: whether it is related to a specific speed, such as some planetary teeth are more obvious in about 50km h. Whether it is related to certain gears, which is very important for judging the failure of the transmission, if a certain gear sounds, it must be related to the components that affect the transmission of the gear; If all gears sound, it is often a common meshing shaft failure or a lack of oil in the transmission.

Whether it is related to specific actions, such as increasing and decreasing gears, starting, rapid acceleration, sharp deceleration, turning, etc., are effective means to judge abnormal noise, among them, changing speed and direction are particularly important for judging the rear axle fault.

Abnormal noise cause 1: after the automatic transmission is flooded, if it is not repaired in time, it may induce a series of problems after a long time, such as oil leakage, abnormal noise, "breaking into the car" and other fault phenomena, and then repair the automatic gearbox, the maintenance cost paid by the owner will increase by 4 6 times compared with before.

Cause 2: If the automatic transmission oil is not replaced for a long time, the automatic transmission oil will become thicker, if it loses its efficacy because of long-term use, there is no protective layer between the components and direct friction, thereby aggravating the wear and tear of mechanical parts, and in serious cases, damage to the automatic wave planet carrier, differential and other components, and the damage of internal parts will lead to abnormal noise in the automatic transmission.

Reason 3: Choose the best automatic transmission oil, do not use inferior transmission oil, because low-quality or counterfeit transmission oil has poor temperature resistance and is easy to oxidize, resulting in sludge and oil residue, blocking the automatic gearbox filter screen and lubricating oil channel, resulting in increased friction of the internal components of the automatic transmission, which may lead to abnormal noise in the vehicle.

Hello dear! There is a clicking sound in the gear, which is similar to the abnormal sound caused by gear friction, which is obviously related to the operation of the three-gear control mechanism, and the key component of the shift operation is the "synchronizer".

You can try the following methods for gear clicking:

1. Check whether the gearbox oil is sufficient, too much oil can be added according to the situation, and the deteriorated oil should be replaced in time.

2. For the clicking sound caused by incomplete clutch separation, please step on the clutch low every time you engage the gear, if the phenomenon is not significantly improved, please check the clutch clearance, free stroke and other parameters.

3. The gears and synchronizers in the gearbox are seriously worn, resulting in too large clearance, and the gears and synchronizers are damaged by replacement.

4. If the gap between the bearing and the spline on the shaft is too large, replace the new bearing and thrust washer.

5. The shift fork shaft is seriously worn, and the shift fork shaft or fork should be replaced.

6. The shaft is bent and deformed, and the bearing is loose and causes abnormal noise, and the shaft and bearing are replaced.

The reasons for the abnormal sound of the manual gear: 1. The clutch is not clear. 2. The gear lever is loose (the connecting rubber sleeve is loose).

3. The internal failure of the gearbox (synchronizer failure) will cause abnormal noise of the gear, sometimes the abnormal noise is normal, such as stepping on the clutch not to the end or the car does not stop and hang the reverse gear is normal, and the specific situation can only be determined by the test drive. It is recommended to find a professional repair shop to check.

First of all, your car has traveled more than 5,000 kilometers According to regular maintenance, the oil should be changed, if the quality of the oil is problematic, it will affect the working effect of the hydraulic and lubrication system The clicking sound of your car may be the sound of the hydraulic tappet knocking on the valve, and there will be a lag phenomenon when the oil pressure is not reached. When the speed of the car reaches more than 2000 rpm, the temperature rises, the oil becomes thinner, and the fluidity increases, so that the phenomenon is eased but cannot disappear completely. So it's recommended that you change the oil first, then check if the hydraulic support is intact or deformed, and then debug.

1. Check the clutch, it may be that the clutch bearing is damaged.

2. Lift the car with the hoist, hit the car, hang up the 5th gear, and listen to the connection between the transmission and the engine below, you can judge whether the clutch is damaged.

Second, it is generally the problem of bearing wear and tear of the starting motor for a long time, open the cover to see if there is a foreign object stuck in the **, if you do not remove the starting motor belt, there is no abnormal sound in the start, if there is a problem with the motor, the treatment method is to add wheel grease, or replace, if there is no internal bearing problem in the engine with a long time of wear, the low-speed start grinding force is loud, and the throttle speed is high, the grinding force is small, and the natural sound is gone.

The solution to the abnormal noise of the car gear:

1. Check whether the reverse gear synchronizer has a tooth beating phenomenon when there is an abnormal noise. The abnormal noise is generally caused by the failure of the reverse solenoid valve, reverse pressure accumulator and buffer, and it is recommended to go to the local 4S store for testing and maintenance;

2. The car synchronizer is a device inside the gearbox, which plays a role in smoothly meshing gears when we change gears while driving. In addition, in order to distinguish it from the forward gear, most cars do not have a synchronizer in the reverse gear, which is why the reverse gear is more difficult to hang than other gears, and sometimes there is an abnormal sound when the reverse gear is engaged;

3. The reverse gear is the gear that realizes the backward function of the whole vehicle, and its driving direction is opposite to the forward gear. In the five-speed manual transmission, its position is mostly set under the fifth gear, and the six-speed transmission is mostly set to an independent gear area, which can avoid the phenomenon of mistakenly hanging reverse gear when the user is moving forward to the greatest extent. The most direct manifestation of reverse gear damage is abnormal noise when driving in reverse gear, and it should be inspected and repaired in time to avoid greater damage.

If the reverse gear is not repaired in time after damage, debris may cause damage to other gears or bearings, or even make the entire gearbox ablative and unusable;

4. The driver who is more proficient in driving operation is relatively fast when changing gears, and the gear shift operation is carried out when the vehicle is not completely stopped or the clutch is not fully stepped on the bottom, so there is a situation of abnormal gear shifting, and the probability of damaging the reverse gear gear will be greater;

5. In addition, the driver who is accustomed to driving an automatic transmission vehicle suddenly drives a manual transmission vehicle, and sometimes forgets to step on the clutch, and it is easy to damage the reverse gear when hanging the reverse gear.

There may be several failure points for analyzing the causes: 1Clutch pedal shaft:

The lack of oil in the nylon sleeve will produce abnormal noise; 2.Clutch release lever: The lever fulcrum is a spherical bulge, and the overload of the clutch will cause the grease to dry up early and cause abnormal noise; 3.

Clutch release bearing and sliding sleeve: Dry grease from bearings and sliding sleeves will cause abnormal noise in the clutch pedal.

Two reasons: the gear linkage mechanism is damaged somewhere; There is a problem with the gearbox.