How to judge the ringing of bearings and gears in automobile manual transmission

Judgment and disposal of common faults or abnormal noises in the chassis.

One; The clutch sounds.

1) Fault phenomenon.

When the engine is idling, after stepping on the clutch pedal, the clutch will make an abnormal noise, relax the pedal, and the abnormal noise will disappear. Sometimes there is a strange sound when you step down or relax the pedal! ~

2) Judgment and Exclusion.

1) When the engine is running at idle speed, the clutch is issued"Rustle"The clutch pedal is hooked up with your foot, and the abnormal sound disappears. The pedal return spring is too soft, repair or replace! ~

2) If the free stroke of the pedal is normal, but when the engine speed and vehicle speed change, the clutch will make an intermittent impact and friction sound, usually because the clutch sleeve return spring is too soft, broken or falling off.

Two; The propeller shaft supports the bearing ring.

a) Characteristics of occurrence.

When the car is moving, it emits an intermittent one"Whine"(like the sound of the wind) or"Buzz"The faster the speed, the louder the noise, the more obvious the neutral gliding sound, and at the same time there is a feeling of vibration!

2) Causes of occurrence.

The reason is that the intermediate bearing is worn, poor lubrication, and improper assembly caused by bearing damage.

3. Exclusion method.

1) After stopping, push and pull the transmission shaft near the middle bearing support frame, if there is obvious looseness, it should be removed and repaired. If the bearing is worn loosely, the damage should be replaced, and the oil seal and rubber parts should be replaced!

2) If the bearing is not loose, support the rear wheel and twist the transmission shaft by hand for inspection. If the resistance is very large, it may be that the bearing is skewed, and the fixing screws at the rubber gasket ring of the bearing frame should be loosened, the bearing position should be adjusted, and the grease should be added!

Three, the drive axle is squeaky.

1) The gap between the final reduction gears is too loud.

1) Ring characteristics, when the car starts, shifts gears while driving, or steps down the accelerator pedal, the drive axle part is felt"Gurgle, grunt"Ringing, when the speed of the vehicle is relatively stable (constant speed exercise), it is generally not sound.

2) Cause of occurrence:

1) Improper adjustment during maintenance:

2) The tooth surface of the gear is seriously worn, resulting in too large a gap between the gears

3) The bearing is worn loosely, damaged or the fastening nut is loose

4) The amount of lubricating oil in the drive axle is insufficient

3) processing methods; Identify the cause in time and fix it.

2) Abnormal noise of the differential.

1) Sound characteristics: When the car turns or jumps due to bumps, there is an abnormal sound at the final reducer. The car does not sound when it goes straight.

2) Solution: When it is judged to be an abnormal noise of the differential, stop immediately to find out the cause and repair it! ~

There are also steel plate rubber sleeves, shock absorber rubber sleeves, and damage to the suspension rubber sleeves will also cause abnormal noise! ~~

Hope mine can help you! ~~

When you step on the clutch yourself, the bearing sound is open-minded, and the sound of the gear is more brittle, and they are very different.

1.Fault phenomenon. The crankshaft bearing ring refers to the knocking sound between the crankshaft bearing and the crankshaft journal, it is a heavy and stuffy gold imitation calendar percussion sound, which becomes larger with the increase of speed and load, and is often accompanied by the phenomenon of reducing the pressure of the lubricating oil and shaking the body.

2.Possible causes. The crankshaft journal and bearing are worn too much, so that the radial clearance is too large; The crankshaft bearing is too long or too short, causing the bearing to break or rotate, and the oil passage and oil hole are blocked, causing the bearing to be ablated or the alloy to fall off; Crankshaft bearing cover bolts are loose.

Diagnostic methods. The sound is heavier and stuffier than that of the cylinder, piston pins and connecting rod bearings; Engine speed.

3.Disposition of the situation. If this fault occurs while driving, stop immediately and tow the vehicle to the nearest maintenance point

The abnormal sound of the crankshaft bearing is observed by repeatedly changing the engine speed and listening to the sound at the oil filler.

The judgment skills of the wheel axle are as follows:

2. The rear wheel bearing is not easy to judge, because the limb is not driven, but it can be replaced with other newer tires, and the sound is the problem of the bearing, and the tire noise is not sound;

3. If the wheels shake when the car runs, and the shaking of the whole vehicle increases, then it can be judged that it is caused by bearing damage, and then it can be speculated that the abnormal noise comes from the bearing.

Transmission squeak and rattle faults are usually caused by a decrease in the oil level of the transmission oil, deterioration of the transmission oil, excessive or too small gear meshing clearance, poor gear meshing, gear debris, wear and damage to bearings or other transmission components, and loosening of the transmission housing.

1. Wear and damage of bearings. When the bearing is worn, its clearance increases, and the fitting accuracy decreases; When the bearing is damaged, abnormal sound will be generated because the bearing cannot operate normally, and even cause damage to the transmission element in the gearbox, resulting in the expansion of the fault.

2. The gear meshing clearance is abnormal. The precision of the parts selected when the transmission element is worn or replaced is too low, resulting in too large a fitting clearance; The gear clearance is too tight during assembly.

3. The bolts of the gearbox housing are loose. The bolt is loosened by vibration during use, and it should be checked regularly.

4. The metal of the gear tooth surface is peeled off, the tooth is broken, and the assembly is misplaced.

5. The grooves of the gear lever and the shift fork in the manual gearbox are loose.

6. The gearbox was flooded and not repaired in time. Over time, it may induce squeak and squeak problems.

7. Poor lubrication caused by insufficient lubricating oil. The corresponding lubricating oil should be replaced.

8. The transmission oil has not been replaced for a long time. Automatic transmission oil is generally changed every 2 years or 4-60,000 kilometers. The manual transmission is maintained once in 3 years or more than 6-80,000 kilometers, and the repaired transmission is strongly required to be first insured in 3,000 kilometers, and then replaced every year or 20,000 kilometers.

Due to the operation of the transmission oil in the high temperature and high pressure environment, it will produce a lot of sludge and impurities, which will lead to the transmission oil becoming thicker and the fluidity is insufficient, so that there is no protective layer between the components and direct friction, which aggravates the wear and tear of mechanical parts and causes abnormal noise.

9. Changed the inferior automatic transmission oil. Because of the poor transmission oil's poor temperature resistance, it is easy to produce oxidation, resulting in sludge and oil residue, blocking the filter screen and oil passage, causing the friction of the internal components of the automatic transmission to increase, resulting in abnormal noise in the vehicle.

Wheel bearing squeak judgment skills:

1. If the tire bearing is damaged, the wheels will make a "buzzing" noisy noise during the driving of the vehicle. If we hear such abnormal noises, slow down the car and feel the abnormal noise carefully to rule out tire noise.

2. Lift the vehicle, swing the wheels left and right with your hands, check whether there is a gap in the bearings, and then turn the wheels by hand, and feel whether there will be a "buzzing" sound again.

3. If the abnormal noise has been clarified, the tire bearing on the abnormal sound side can be removed, and check whether the bearing runs smoothly.

4. If it is found that the bearing is transported and there is no sign of damage, it can be guessed that it is caused by the lack of lubrication at the half-shaft spline, and try to coat the half-shaft spline and bearing spline with grease before testing. If the bearing is damaged, it can be replaced.

Most of the abnormal noise of the bearing in the gearbox is caused by the abnormal wear of the bearing, so it is said that if the maintenance is not carried out in time, then it is likely to lead to more and more serious wear, and then lead to more and more obvious abnormal noise, so it is recommended that you go to the repair shop in time to repair the abnormal noise, and the specific problem of the degree must be based on the actual inspection results to be finalized.

In the whole process of car application, more or more than the bench less all kinds of small problems, especially the transmission, this thing but a very critical component in the car, but also a component that often has problems, some cars will occur after two years of driving the abnormal sound of the rolling bearing, especially in the medium speed exercise, the sound will be higher very similar to hissing, the key is also caused by the lower fiber Tan list of several types of conditions, let's analyze it below.

There are some abnormal noises in the transmission because the oil volume of the gearbox is too low, that is, the lack of oil, the parts are harmed, of course, there will be abnormal sounds, most of this kind of sound is the sound of friction, if the more brand image of the metaphor of this kind of sound, very similar to the sound of beer bottle caps rubbing the concrete ground, it is not necessarily this kind of sound, sometimes there will be impact sound, at this moment it is very likely that the oil amount is too low or the oil in the gearbox has already changed, can not be used normally, In particular, a part of the rolling bearing must be moistened with a large amount of grease, and at this time, the oil is relatively small or the oil has already mildewed, which will endanger the rotation of the rolling bearing.

There are also cars often in the very bumpy vehicle driving, it is very easy to cause the transmission gear gap is too large, although both sides of the two transmission gears are sealed, not easy to fly out, that is because the gap will cause different transmission gears to collide with each other, and in the collision process with the rolling bearing has a strong friction, will also make the rolling bearing send out abnormal noise, this kind of abnormal sound is closer to the gurgling sound, very similar to the grinding sound, if this kind of noise occurs, as far as possible to immediately go to maintenance, And narrate the sound to the maintenance master.

There is also a very common situation that the rolling bearing has been loosened or more serious damage, at this moment in the course of the driving will occur quite a large friction sound, but this abnormal sound is not all gears will occur, after all, the position of the damage is not the same, or this kind of situation, the vast majority of the case in the middle of the speed of 60 70 miles is more obvious.

All in all, after discovering that there is a small problem with the car, you should immediately carry out repairs, and you don't have to drive the problem car out, let alone drive the faulty car out of the house.

1. Automatic gear frustration, impact, slippage (valve body failure).

There are three main reasons for abnormal noise and frustration of automatic transmissions.

There is no power at the start, and the car has obvious staggering and frustration when driving at low or medium speeds, and the tachometer hand on the dashboard floats up and down at the same time; In the case of pressing the accelerator pedal sharply during medium and high-speed driving, the car slips, and the tachometer needle rises sharply and has an obvious sense of impact; Hung from P gear to R gear and D gear, the car has an obvious sense of impact and breaking gear.

**: Due to the high oil temperature of the automatic transmission, stubborn dirt and impurities appear in the gearbox, forming a blockage in the valve body, resulting in poor movement of the solenoid valve, and the oil pressure cannot be adjusted sequentially, resulting in frustration, impact and slippage failure.

2. The automatic transmission is noisy and noisy.

There are three main reasons for abnormal noise and frustration of automatic transmissions.

When the car is idling or driving and driving under high load, it hears abnormal noises in the transmission, even loud noise, and rhythmic and dull sounds when switching gears.

**Yes: Under long-term high temperature, the anti-wear performance and lubrication performance of the transmission oil decrease, and the bearings, gears and other components in the transmission are worn or seriously worn, or the gear side is damaged.

3. The temperature of the automatic transmission is too high.

There are three main reasons for abnormal noise and frustration of automatic transmissions.

During driving, the computer slowly Changkai displays an alarm: the gearbox temperature is too high; Or after driving for a while, you feel that the gearbox is overheated, or even hot.

**: The temperature cannot be effectively controlled when the transmission is running under high load! If the temperature is higher, the gearbox starts to slip, which in turn causes the temperature to rise even higher.

Audi and other high-end models will alarm and enter the transmission protection mode) If it is not solved in time, the transmission will be scrapped and disturbed.

1. If the automatic transmission is not repaired in time after water ingress, it will cause a series of automatic transmission failures. Such as: oil leakage, abnormal noise, impact and other faults.

2. If you do not replace the automatic transmission slip only tank oil for a long time, the automatic transmission oil will become thicker, and the long-term use will make it lose its efficacy, and there is no protective layer between the parts and direct friction, which will aggravate the wear and tear of mechanical parts, and damage the automatic transmission planetary carrier, differential and other components in serious cases, so that there will be abnormal noise in neutral.

3. The use of inferior transmission oil, low-quality or counterfeit transmission oil, poor temperature resistance, easy to produce oxidation, resulting in sludge and oil residue, blocking the automatic transmission filter and making the net and lubricating oil channel chaotic, resulting in increased friction of the internal components of the automatic transmission, abnormal noise failure.

First of all, the abnormal sound made by the broken bearing is a continuous buzzing sound, like the sound of metal rubbing, and then the car is driving on the road, if the road surface is rougher, the abnormal sound caused by the broken bearing will not change due to the roughness of the road surface.

Cars are an important tool for human beings, providing convenience for human travel. Each component of the car is very important and plays a key role in the safe travel of the car. The bearings of the car are also checked, maintained and replaced regularly.

Wheel bearing squeak judgment skills When the bearing of the car is broken, the car will make a continuous buzzing sound. If the humming sound does not change after the car has been accelerated to a certain level and the humming sound is caused by the broken wheel bearings. There is also a symptom that if you turn the steering wheel when the car is in place or at low speed, the car will make a squeaky sound, and in severe cases, you can feel that even the steering wheel vibrates.

The difference between tire noise and broken bearingSome people are afraid of confusing the obvious tire noise with the abnormal noise of the car due to the broken bearing, but in fact, there is no need to be afraid, the two are easy to distinguish. First of all, the abnormal sound emitted by the broken bearing is a continuous humming sound, like the sound of a metal wheel rubbing, while the tire noise does not have this sound. Then the car is driving on the road, if the road surface is rougher, the sound of tire noise will be more obvious, and the abnormal noise caused by the broken bearing will not change due to the roughness of the road surface.

When you find that the wheel bearing is broken, you must replace it in time. Because when the bearing is damaged, it will lead to an increase in driving resistance, more fuel consumption, and in serious cases, it will also damage the wheel mechanism of the car and cause the wheel hub to fall off, which will affect the safety of the Xingzen Tong morning car.

Photo by Q&A) NIO ES8 NIO ES6 Wenjie M5 NIO EC6 Xpeng P7 Trumpchi GS8 @2019