Gears are difficult to engage: reasons

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Gears engage with effort: gearbox malfunctions

In cars with a manual transmission, gear shifting is done by the driver himself. Using a lever from the interior, it acts on the rocker and then on the entire gearbox mechanism. Simply put, the driver moves the gears on the shafts.

Since the shafts rotate at high speeds, cooling is required. This is done using special gear oil. Oil also protects the surfaces of rubbing parts from premature wear. The lubricant must be changed on time. On average, this is done after every 40-50 thousand kilometers.

As for the reasons for tight gear engagement, there may be several of them. However, most often they are associated with problems in the clutch or the gearbox itself. If you study the list of the most common breakdowns, then you can highlight the following:

the link is poorly adjusted. In particularly difficult cases, it may be necessary to replace the plastic bushings. This procedure, like adjustment, can be done on your own;
hydraulic drive failure. If it leaks, you may not be able to engage the gear at all, since it is impossible to disengage the clutch;
the clutch cable has broken or fallen off (in a cable clutch);
The clutch basket has failed.

The exception is reverse gear, since it does not have synchronizers; By the way, when the reverse gear is difficult to engage, extraneous noises, clanging, and crunching often occur. Such phenomena directly indicate wear of the gear teeth.

What's the result?

It is important to understand that a manual transmission is a reliable unit, which normally should not cause discomfort to the driver when driving a vehicle. This means that if the gearbox is in full working order, the work should be clear and balanced

If the driver notices extraneous vibrations, noises, etc., or there is an unclear shifting or knocking out of gears while the car is moving, then it is necessary to immediately diagnose the manual transmission.

At the same time, it is important to determine not only why the gearbox does not turn on or why the manual transmission gears are difficult to engage, but also to eliminate the cause as quickly as possible.

In other words, driving on a faulty gearbox can lead to bearings being destroyed, etc. As a result, further damage to the components and mechanisms of the manual transmission cannot be avoided, and the cost of repairing the gearbox in this case increases significantly.

Gears are difficult to engage: causes, solutions

When the speed of the car begins to turn on heavily, it not only causes an unpleasant feeling, but also makes the operation of the car unsafe. In this article we will analyze the reasons why gears are difficult to engage or do not shift at all, which is usually associated with this.

The gearbox is a complex mechanism that requires constant maintenance. Including regular diagnostics and gearbox oil changes. Ignoring these measures often leads to problems with gear shifting.

What are the reasons for poor gear shifting?

Difficulty shifting gears can occur as a result of improper operation of the gearbox, or due to operation of the vehicle on bad roads. Problems with the gearbox sooner or later occur in used cars.

If you have difficulties when trying to switch to another gear, you cannot shift or it takes a lot of effort, then there is clearly a malfunction. Most often, car owners turn to a car service center when they have difficulty engaging first gear or reverse gear . A fairly common problem on VAZ and Ford Focus cars.

Let's look at the faults that lead to difficult gear shifting:

Clutch malfunction. In this situation, the gears will engage either poorly or not completely. A common occurrence in VAZ cars that have fur cables. the clutch is moving away from the mount.
Problems in the drive of the switching mechanism. Broken traction leads to difficult engagement of 1st and reverse gears.
The jet thrust is faulty.
Wear of plastic parts in the box control drive.
The slide is incorrectly positioned. A weighty element, incorrect adjustment leads to malfunctions.
Bearing wear. This is a fairly rare occurrence; anyone can experience this, especially when you have a manual transmission. In such a situation, it is usually difficult to engage first gear.
The box shaft is faulty. By itself, it is not subject to heavy loads, which could lead to wear. A factory defect may cause the entire unit to be replaced.
Clutch failure. Often found among owners of cars with an automatic transmission. The malfunction is eliminated by replacing the clutches.
Faulty synchronizers are the most common problem among gearbox breakdowns. They are made of brass, and this metal itself is quite soft. During use, it wears out and wears out. The breakdown is usually accompanied by a grinding noise when switching to another speed.

Some faults can be diagnosed and fixed independently, but failure of the bearings or shaft cannot be determined. For these purposes, you need special tools and equipment, as well as experience. In this situation, if you have problems shifting gears, it is best to go to a service station.

Why is it difficult to engage manual transmission gears?

manual gear shifting

The most common problem is clutch failure. In such a situation, reverse gear turns on with a bang. This happens because the gear overlaps the tooth. Reverse speed is the only gear in the box that does not have synchronizers. For this reason, clutch failure is so obvious on it.
The second reason is a defect in the mechanism responsible for selecting the gear. This breakdown occurs when the car is stationary and you try to shift into gear.
The third is severe wear of the gearbox synchronizers. Mostly, breakdowns occur with those that are most often used. These are first, second and third gear. Severe wear of the synchronizers only appears when switching while driving.

To prevent possible gearbox malfunctions, perform regular maintenance, change the oil on time, and in case of minor failures, rush for diagnostics . This will save you time and money in the future.

Watch the video for what not to do with a manual transmission:

What to do if it is difficult to engage reverse gear?

If you have difficulty engaging reverse gear, do one of the following :

When you feel that the gear has not reached the end, release the clutch slightly, and the gear will be inserted all the way.
Fully depress the clutch and only after a few seconds engage reverse gear.
Depress the clutch, set the gear to neutral and release the clutch. After this, press down and engage reverse gear.
Shift into reverse through another gear. For example, first engage 4th and then shift to reverse.

How to properly engage reverse gear on a Hyundai Solaris, watch the video:

It's hard to engage first gear

Many drivers who encounter this situation try to force the gearbox selector to engage 1st speed. But this is fundamentally wrong and should not be done this way.

In this situation, it is necessary to use the regas method . Its essence is as follows:

While driving in second gear, depress the clutch and set it to neutral and then release the clutch.
After this, you need to press the gas pedal, increasing the speed to 2.5 thousand.
The next step is to engage the clutch again by pressing the pedal all the way and turn on the first gear on the gearbox. If you still have difficulties with this, then you need to repeat it, because... You gave too little gas, there were too few revolutions.
If all the steps are performed correctly, the first speed will turn on without any difficulties or sounds.

However, this method should not be used on an ongoing basis when it is difficult to engage 1st gear. This method is temporary in order to at least get to the service station without any problems. In any case, the box will have to be repaired.

What to do when it’s hard to engage 1st gear on a car, watch the video from a driving instructor :

The procedure for replacing synchronizers requires experience, relevant knowledge and special tools, so it is better to contact professionals. Automotive technicians will perform the replacement quickly and efficiently, and will also advise you on further operation and maintenance of the box.

The main causes of manual transmission malfunctions

In good condition, a car with a manual transmission accelerates quickly and without jerking. It is worth highlighting the symptoms that a malfunction of the gearbox on the car has occurred:

one or more gears do not engage;
changing speeds is difficult;
“knocks out” the transmission, extraneous noise is heard;
the appearance of oil smudges under vehicles.

The range of occurrence of these manifestations is quite wide, ranging from gear wear to the use of low-quality gear oil. As a rule, a problem with shaft bearings occurs if vehicles have been in operation for a long time. If they are worn out, noise may occur at idle.

If there is no lubrication on the bearing or there are cracks on the rollers, a whistle may be heard.

The clutch includes a disc and a basket. Malfunctions of the basket may be associated with wear of the “petals”, as a result of which it will overheat, which will affect the efficiency of changing speeds. Gears often fail to shift because the friction linings of the disc have become deformed. Against this background, a drop in power indicators may be observed.

In case of any manifestations, you cannot do without diagnosing the car transmission. This procedure should be entrusted to car service specialists. In some cases, repair work may involve replacing the transmission fluid. Adding new fuel to the existing old one is allowed, but you should use fuel of the same brand that was previously added. Otherwise, mixing liquids of different brands will negatively affect the functioning of the vehicle.

How to engage first gear without harming the gearbox?

Often, inexperienced motorists, turning the gearbox selector from second to first speed, may notice how some difficulties arise, in particular, how difficult it is to engage first gear. In such cases, a novice driver often tries to turn on the speed using force, simply by driving the selector into the desired position. This should not be done under any circumstances, since such actions can be fraught.

Actually, having noticed such a drawback in the manual transmission, motorists developed a rule - the first speed should be engaged only in order to move away. In all other cases, second, third and fourth gears are engaged. Experienced motorists especially often use this rule, but we would like to say on our own that this is fundamentally wrong.

Operating principle of gearbox synchronizers

Any driving instructor will tell you that the choice of speed should be based on driving speed and engine crankshaft speed. In principle, even parking normally is only possible in first speed. If you try to park in second gear, you will have to maneuver very quickly, and in such cases there will be a strong load on the clutch. Actually, just like the gearbox unit itself. Accordingly, you must learn one simple rule for yourself - you can engage first gear when driving only if the speed is low and the crankshaft speed is low.

Why did the gearbox shift poorly?

There are several factors that can lead to difficulty shifting gears on a manual transmission. In particular these are:

clutch problem;
breakdown of the gear selection mechanism of the gearbox;
warping of the driven disk;
wear of synchronizers.

In addition to this, a leak may appear from the box. It seems possible to eliminate the problem with fluid leakage from the gearbox by replacing the rubber seals and the drive shaft seal.

If the problem lies in the clutch, then because of this the reverse gear will engage with a characteristic crash. The clutch fork must be checked. If this component of the box is damaged, it must be replaced. You should also pay attention to the driven disk.

Gears engage poorly even when the gear teeth are worn. In this case, a characteristic noise may be noted when the gear is in gear when the engine is running.

In some cases, adjusting the backstage helps to restore the functioning of the gearbox. This component of the box ensures the connection of the gear lever with the gearbox. If the backstage is deformed, it needs to be replaced. As a rule, in this case there may be not only a problem with shifting gears, but also a large stroke of the gearshift lever itself.

The breakdown of the gear selection mechanism is due to the fact that there is damage to the gears, bearings or synchronizers, i.e. components of the manual transmission.

As for the synchronizers, when they wear out, 1st, 2nd, and 3rd gears do not engage. As a rule, when a change of modes occurs, a characteristic crunching sound becomes clearly audible. Also, manual transmission gears can activate spontaneously.

Precautions for operating a car with manual transmission

In order not to encounter problems with manual transmission, you should not neglect to undergo a technical inspection. To accurately determine the nature of the problem, you need to remove the box to disassemble it and then troubleshoot it.

When the speed decreases, for example, if you are driving uphill, you should switch to a lower gear. This ensures efficient movement over rough terrain.

It is possible to replace worn manual transmission components if the gear does not engage on your own, but you should know the design features of the gearbox.

The frequency of checking the oil level is approximately 15,000 km on a car with a manual transmission. Each individual car model with a manual transmission has its own oil change period. If the machine is used non-aggressively, as well as using high-quality fluid, replacement may be necessary after 50,000 km.

When moving forward, you should not engage reverse gear. This is the main reason that the box failed.

When changing gears, you should fully depress the clutch pedal. Otherwise, the car owner may experience damage to gears and synchronizers.

Thus, the durability of a manual transmission depends on the operating conditions of the vehicle. With frequent trips over rough terrain, the gearbox is subjected to stress, and as a result, gear shifts become more difficult. Car diagnostics required. This procedure checks the tightness of the clutch hydraulic circuit. To extend the service life of the gearbox, you need to undergo timely maintenance, change oil, filters, and worn-out spare parts.

Problems with automatic shifting

An automatic transmission is very demanding in maintaining the oil level and its condition, unlike a manual transmission. Too high or low oil level can lead to machine malfunction. In addition, due to a lack or excess of oil, difficulties may arise in switching gears.

The most common automatic transmission faults:

Forward gears do not engage.
There is no reverse gear, forward there is only 1st and 2nd.
All speeds are engaged except reverse.
The gears don't engage at all.

The oil level in the automatic transmission is checked using a dipstick. If the oil level is low, add.

Poor activation due to the slider

Communities GAZ Volga Blog Expansion foam
First, let's look at why first gear doesn't engage well and the problem is with the transmission.

Often the problem with turning on the speed lies in the latch and slider. The appearance of a burr near the groove for the retainer on the slide can easily prevent the ball retainer from entering the groove. When moving the slider, the latch rests on this burr and cannot overcome it without significant effort from the driver. In this case, the gears come very close to each other, but do not engage, and the teeth of one gear hit the other.

In the future, such beating can lead to flaring of the teeth, and the impossibility of engagement will be due to the fact that due to this flaring, the teeth will no longer be able to engage.

Theory of gearbox operation

At the moment, all modern gearboxes are equipped with synchronizers, which are important elements of the gearbox. The essence of how synchronizers work is that they equalize the operation of the gearbox shafts.

Every driver, when switching from second to first gear, has encountered a situation where some kind of obstacle was felt. What prevents you from engaging first gear while driving. This is the synchronizer.

If you have a fairly new transmission, then when switching from an upshift to a downshift you will not find yourself in such a situation. Switching will be carried out without problems. This manifests itself as the components of the unit are used and worn out.

Watch a video about the design and operating principle of the gearbox:

Repair

Regardless of what exactly you do with the rocker - repair, adjust or change, you will still need to disassemble this unit.

https://youtube.com/watch?v=O6k7u9APbvw

Disassembly is performed as follows.

Remove the cover from your gear shift knob.
Place the car on a pit, or raise the front end with a jack.
Remove the front console. It is held in place by mounting bolts.
Now remove the curtain itself. To fix it, AvtoVAZ used 6 bolts in the case of the VAZ 2110 model.
When carrying out dismantling work, be sure to examine the condition of all elements.
By bending the boot, you will gain access to the support, oil seal and cardan shaft.

Changing the boot
Now as for the repairs. There may be several recommendations in this regard, depending on the current state of the node and its components.

At best, repairs will require the use of a repair kit for the backstage. It doesn't cost much.
If the bushing is deformed, it will need to be replaced with a new one.
Check the lever shaft bore for wear.
Make sure there is no play in the driveshaft. Otherwise, a regular repair kit will no longer be enough, that is, a complete replacement of the entire backstage will be required.
Often the culprit of extraneous noise and rattling when shifting gears in gearboxes is the rocker pad. Changing it is quite simple, and even a beginner can perform the operation.

Replacing the oil seal

Quite often, VAZ 2110 owners are faced with a situation where, after parking under the car, they find traces of oil. There are two options here - the oil filter has worn out or there are problems with the oil seal.

As you replace the oil seal, you will be able to simultaneously inspect and change such elements as the cushion, cardan shaft, and boot.

Dismantling works

But let's talk about everything in order. First of all, check whether it is really an oil seal and not a filter. If everything is fine with the filter, then we drive the car into a pit or find another way to end up under the bottom of your VAZ 2110. Beforehand, it would be a good idea to watch video materials regarding your current situation.

Carefully inspect the boot. If oil leaks from the gearbox through the oil seal on your car, traces of it will definitely remain on the boot.
Bend back the boot. This way you can get to the cardan, disconnect it and gain access to the cuff.
You first need to dismantle the cardan from the lever, and only then from the rocker itself. Not the other way around.
The cardan has been removed, so we move to the oil seal.
The cuff is removed from the gearbox using a hook and an awl. Therefore, make sure you have these tools at hand in advance.
Now a new one is installed in place of the old oil seal. Craftsmen have adapted to using ordinary plastic bottle caps. If you get used to it, it turns out to be very easy to change the oil seal.
After replacing the element, return all dismantled components to their places. If some of them need replacing or signs of wear are already visible, it is better to replace them immediately. It is unlikely that you will want to repeat the same operation in a couple of weeks and lie under your own car.

Repair will not give the desired result if the adjustment was carried out with errors. To do everything carefully and competently, use the help of a partner. One will work under the car, the second will help from inside.

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Why don't the gears shift when the engine is running?

Shifting gears in a manual transmission should be easy and quiet, regardless of whether the engine is running. In general, the engine is connected to the gearbox through a single unit - the clutch. It is with this that the difference in ease of switching is associated. There is one exception to this rule, which will be mentioned later.

Mechanism of interaction between the engine and the gearbox

The torque created by the car engine is removed and transmitted further from the flywheel. The flywheel is usually installed at the rear end of the crankshaft and is securely attached to it with several bolts. The bolts are equipped with special fixing belts in the threaded areas or are installed on an anaerobic retainer. Problems with fastening are extremely rare and are associated with gross mistakes by inattentive or unscrupulous servicemen.

The flywheel is a massive steel part with a machined end surface during manufacturing, along which the front friction lining of the clutch driven disc operates. When the clutch is engaged, the driven disk itself is tightly pressed to the flywheel by a powerful diaphragm spring of the drive disk. The spring, working surface and drive plate housing form the clutch basket. The basket is attached to the flywheel with several bolts around the perimeter of the casing.

The driven clutch disc is located between the flywheel and the drive disc, sometimes called the pressure disc. It consists of two friction linings, respectively to the flywheel and to the pressure plate, a damping device and a splined hub that slides freely along the splines of the gearbox input shaft.

When you press the pedal through a mechanical or hydraulic drive, the release bearing moves along the input shaft of the gearbox. The basket spring compresses and ceases to exert pressure on the driven disk. Zero force on the disc linings will result in zero friction between the flywheel and the linings. The primary shaft of the box, connected by splines to the disk hub, will stop its rotation. In such a situation, engaging a gear in the box is no different from the situation when the engine is not running.

Problems with switching to automatic transmission

Shifting problems with automatic transmissions are not uncommon. Problems with the automatic machine arise for several reasons.

backstage malfunction . This mechanism is the most problematic in old-type automatic transmissions. To eliminate the malfunction, the unit will need to be replaced. In most cases, it will be necessary to dismantle the gearbox for these purposes;
insufficient oil level . The presence of lubricant leaks on the automatic transmission housing may indicate wear of the sealing gaskets, which are not difficult to replace yourself. After this, you need to change the oil in the box. Also, owners of cars with an automatic transmission are recommended to visually inspect the gearbox for oil leaks at least once every 2000 km;
problems with the transmission control unit can ultimately cause the automatic transmission to completely lock up. To fix the problem, you will need to replace the failed mechanism and thoroughly inspect the electrical part of the gearbox.

Important! To solve problems with automatic transmission, it is recommended to conduct computer diagnostics of transmission faults.

Manual transmission: What you need to know when shifting gears

The result is premature wear of the clutch disc. In order to keep the car from rolling on an incline, you need to depress the brake pedal. In order to start, of course, you will have to press the clutch and smoothly press the gas, releasing the clutch. In this case, you will reduce the load time on the clutch basket and release bearing. You can also hold the car by maintaining certain engine speeds, catching a certain moment when you release the clutch and press the gas.

Surprised? But in fact, this advice is really very important, because having a habit of leaving your hand on the gear shift knob can lead to premature transmission failure. If you most often leave your hand on the gearbox when stopped in a traffic jam or at a traffic light, then the first gear of the manual transmission suffers the most. Remember that by placing your hand on the gearshift knob, you create extra pressure on it, which is transferred to the gearbox. As a result, excess pressure on the handle can lead to unfree shifting of the desired gear. This can damage the gear shift knob as well as the transmission itself.

Clutch disc and flywheel

In fact, wear occurs both at the clutch disc and at the flywheel itself. However, here, most likely, the gears will shift, but slip! You release the clutch pedal, but slippage occurs, that is, the car does not move, and it may jerk.

We look at the disk, maybe change it. We also look at the wear on the flywheel! If it is large, then we change it completely.

From experience I can say that our working VAZ 2111 was used mainly intercity, after 2 - 3 years the mileage was very high. The following symptoms began to appear: the gears turned on very poorly when the engine was running! We removed the manual transmission, looked at the basket - clutch disc - flywheel. And everything went for replacement, there was a lot of wear, and one petal on the basket was cracked. They even changed the release lever and the fork.

For what reasons do interruptions occur?

There can be many reasons why gears do not shift when the engine is running. However, all of them, in one way or another, are connected with the two most important units of the car - the engine or gearbox. In case of serious damage, you should contact a good car service.

If the problem is in the gearbox, it will need to be removed for further disassembly and troubleshooting. If the problem is with engine components, they may need to be replaced. However, there are cases when, to eliminate a malfunction, it is enough to carry out preventive maintenance: removal, lubrication and careful adjustment of the components.

Why is it difficult for the gear lever to shift on a manual transmission?

After the desired shift has occurred, you need to release the clutch pedal, there is no need to hold it! Because there is increased wear on the clutch disc

It is advisable to move in the gear that corresponds to a given speed, this relieves both the engine and the gearbox from unnecessary loads, the best is 4th gear, also called “direct”, in this connection the minimum number of gears and all two shafts are occupied (in bypassing the intermediate). This reduces wear on the manual transmission
A lower gear should be engaged when the speed decreases, just like an upshift when accelerating.

The main causes of malfunctions Mechanics, like automatic ones, are designed to transmit and change torque from the power unit to the wheels, and this must be done comfortably and dynamically. That is, the car must accelerate as quickly as possible and do this without any “jerks” of prohibitive engine speeds (so that it does not “growl like a victim”) and, if possible, have sufficient traction forces.

Symptoms of delayed gear shifting

Like any complex mechanism, an automatic transmission can have malfunctions. There are often cases when the automatic transmission changes gears with a delay, delaying them for 2-3 seconds. At this moment, a “failure” of power occurs, and the car sharply loses speed.

Read

How to drive an automatic car correctly

In order for the shift transition to take place, the oil pressure increases. The pump wheel transmits torque to the turbine wheel. When they reach a certain acceleration, the clutches brake the lower gear, and the oil through the valve accelerates the next stage. This is how automatic transmission speeds change without “failure”.

During tightening, the speeds do not switch on time, although the torque increases to a dangerous 3.5 - 4 thousand. After this, there is a delay in switching for a couple of seconds. The car then loses power and shifts into overdrive. The presence of such failures during automatic transmission operation is a serious flaw and a reason to start diagnosing the unit.

Why don't the gears shift when the engine is running?

The problem of shifting gears while the engine is running is common, especially in cars with a manual transmission. The malfunction can occur either completely unexpectedly, or gradually, making itself known by the appearance of a characteristic grinding sound and difficulties when shifting gears. In any case, without eliminating the cause of the malfunction, you will not be able to operate the car.

For what reasons do interruptions occur?

What you can do with your own hands

There are a number of simple actions that can prevent the automatic transmission from stalling.

Reasons why the transmission delays the transition between stages	Troubleshooting Methods
Automatic transmission overheating	Lack of transmission oil level, heavy loads on the automatic transmission;
Wear and destruction of internal mechanisms	Clean the magnet, change filters;
Sensor malfunction	Replace them, preferably with original ones

Servicing a car when the automatic transmission is delayed in transmission does not always mean many problems. Some automatic transmissions are capable of exceeding the 500 thousand km mark without major repairs. To check the transmission for gear drag, it is recommended to turn on the kickdown mode. Its name describes the moment itself: push down.

If, while driving a car with automatic transmission, you sharply press the gas pedal, the car goes to a lower gear so that the speed increases as quickly as possible. If this moment passes quickly and without interruptions, then the box does not delay transitions and is in good working order.

Read

Which gearbox is better, automatic or manual: pros and cons

The simplest actions that any car enthusiast can perform for his favorite iron horse when tightening is to change the oil filter and the “transmission” itself in the automatic transmission. But you need to buy consumables in trusted places so as not to stumble upon a fake.

Troubleshooting methods

Once the source of the problem has been found, you can begin to eliminate the causes of the malfunction.

If the problem is in the engine

The simplest cause of problems when shifting gears can be a leak of brake fluid, which is the working fluid for the clutch. If there is insufficient lubrication in the clutch hydraulic system, it will not engage fully. Therefore, first check the fluid level in the car's tank. If the level is low, check for leaks, repair defects and bleed the clutch. When the fluid level is at the normal level, the clutch elements should be inspected.

Clutch problems

The clutch consists of three main components:

disk;
release bearing;
baskets (pressure disk).

Malfunctions of these units can lead to problems with gear shifting when the engine is running.

The fact that the bearing is failing may be indicated by the appearance of a rustling or distinct hum when the engine is running and the clutch pedal is pressed to the floor. When you release the pedal, the noise should stop. When the bearing completely jams, it will no longer be possible to operate the gear shift mechanism. In this case, the unit will need to be replaced.

A faulty basket can also cause the problem. This often results from critical wear of the petals. In this case, the basket stops performing its functions when heated, and it is not possible to completely remove the pressure disk. Therefore, after removing the box, it is necessary to carefully inspect the basket for deformations and other defects. If the condition of the unit is not satisfactory, it should be replaced with a new one.

Finally, the last reason for problematic gear shifting associated with the clutch is wear or deformation of the disc and the friction linings on it.

Important! After the failed elements are replaced, during assembly the box should be centered and the clutch should be pumped.

The problem is at the checkpoint

The most common cause of a gearbox malfunction is wear of the synchronizers. You may have previously been warned about this by a characteristic crunch when changing gears. Synchronizers that smooth out the angular speeds of the shafts are usually made of copper and are therefore subject to wear.

Much less often, the gearbox shafts themselves can fail. In this case, a separate transmission may not be included. The degree of wear and the need for replacement is also determined after dismantling and disassembling the transmission.

Important! To eliminate faults that have arisen in the box, a major overhaul may be required, which is not cheap and does not happen quickly. Therefore, you need to be prepared for the fact that your car will be delayed in service.

However, you should not immediately think about the bad. Sometimes a problem with gear shifting can be caused by a lack of oil in the gearbox. Loud noise while driving or a metallic grinding sound in the box may indicate insufficient oil level. If there is a complete lack of oil, you will not be able to change gears at all: the synchronizers will not function properly. Changing the gearbox oil is recommended every 60-80 kilometers.

In addition to checking the oil level in the gearbox, you will also need to inspect the unit body for damage and the absence of lubricant leaks through the gaskets and seals.

Table of faults and their elimination

Manual transmission malfunction

Cause and remedy

One or all gears do not engage

Wear, broken synchronizers (broken teeth), broken clutch basket petals, a problem with the fork or release bearing, a broken shaft or gears, faulty linkages to the manual transmission (they may need to be adjusted with the replacement of plastic bushings), low oil level, or the wrong transmission fluid has been filled ( maybe water got in)

Noise in neutral when the engine is running

Wear of the bearing (drive gear or drive shaft), low level of lubrication, dirty (worn out oil), ingress of dirt or water, it happens that there is a malfunction in the shaft itself (for example, it is overheated initially)

Noise when gears are engaged (in all gears) – the engine is running

The same reasons as in neutral, the bearing of the output shaft or driven gear has collapsed, the clutch and engine housings are not aligned

Noise in one gear engaged, engine running

The synchronizer is broken, the teeth of this gear are worn out

Crunch when switching

Clutch malfunction (basket, disc), drive does not work (cable breaks, fluid leaks), synchronizer wear, gear malfunction, sometimes the box unscrews itself (you need to check the fastening)

Gears disengage on their own (either when accelerating or when resetting)

Problem with synchronizers, broken gears, damaged gear forks, destruction of shaft bearings, manual transmission unscrewed, damaged gear shift rods

Vibration from manual transmission when engine is running

The power unit itself operates unevenly, the manual transmission has come loose, the fastenings to the body are broken, the supports are destroyed

Oil leak from manual transmission

The oil drain plug is leaking, oil seals and O-rings are leaking, there is too much oil inside, the manual transmission housing is broken (cracks have appeared as a result of impacts)

This is not all, but the most common reasons, of course, to eliminate them you need qualified help; you are unlikely to do anything yourself, if only because removing a manual transmission, especially on a front-wheel drive one, is not so easy. The thing is that the main faults lie inside and in order to identify them, in any case you need to remove your gearbox.

Problems with switching to automatic transmission

Shifting problems with automatic transmissions are not uncommon. Problems with the automatic machine arise for several reasons.

backstage malfunction . This mechanism is the most problematic in old-type automatic transmissions. To eliminate the malfunction, the unit will need to be replaced. In most cases, it will be necessary to dismantle the gearbox for these purposes;
insufficient oil level . The presence of lubricant leaks on the automatic transmission housing may indicate wear of the sealing gaskets, which are not difficult to replace yourself. After this, you need to change the oil in the box. Also, owners of cars with an automatic transmission are recommended to visually inspect the gearbox for oil leaks at least once every 2000 km;
problems with the transmission control unit can ultimately cause the automatic transmission to completely lock up. To fix the problem, you will need to replace the failed mechanism and thoroughly inspect the electrical part of the gearbox.

Important! To solve problems with automatic transmission, it is recommended to conduct computer diagnostics of transmission faults.

Reasons for long switching

The automatic transmission delays changing gears for several reasons:

insufficient tension of the throttle cable;
damage to the rubber adapter of the modulator;
incorrect modulator adjustment;
overheating of the automatic transmission due to worn-out transmission oil;
accumulation of metal shavings in the working chambers of the automatic transmission;
oil filter clogged;
improper operation of a vehicle with an automatic transmission (slipping off-road, transporting heavy loads, trailers, towing other vehicles;
failure of the solenoids responsible for changing automatic transmission gears;
failure of electronic sensors.

Shifting from 1st to 2nd gear

The movement of a car with an automatic transmission begins with depressing the brake pedal. At first speed, the car moves only for the first few meters of the path, then the stage changes. Often there is a prolonged switching from 1st to 2nd speed due to insufficient heating of the unit, in particular the transmission oil.

If there is a lack of transmission, there is also a disturbance in the smooth operation of the automatic transmission. To correctly measure the oil level, you need to check the dipstick twice: with a cold engine and once with a warm one.

Read

How to remove and install automatic transmission

Shifting from 2nd to 3rd gear

The reasons why the automatic transmission delays the shift between the second and third stages may be due to severe wear of the internal mechanisms or damage to the rubber adapters. The rubber adapter fits the modulator. It may dry out and crack. As a result, the pressure on the modulator decreases, and a stream of air emerges from the crack, which can be felt by hand. As a result, the automatic transmission delays shifting.

The pressure in the modulator itself may be too high. It is recommended to turn the regulator knob a few degrees counterclockwise in the direction of decreasing pressure. Another reason for prolonged transmission operation may be that the cable running from the automatic transmission to the engine is too loose. It is located on the right side of the driver's seat.

Shifting from 3rd to 4th gear

In most cases, why there are delays in shifting gears on an automatic transmission with mileage, the reason is wear of the internal mechanisms. Metal parts wear off on adjacent surfaces and the friction force changes. The engagement between the clutches becomes less efficient and the gear does not increase at the right time.

Wear of parts responsible for changing automatic transmission speeds often affects tightening and untimely switching between 3rd and 4th stages. At this moment, the transmission behaves as if it had been switched to neutral for a couple of seconds.

To troubleshoot problems, in particular shift delays, you first need to check for chips on the automatic transmission pan magnet. If there is a lot of it, this is a sign of severe damage to internal parts. After washing the pan, changing the oil, washing the internal and replacing the external filter of the automatic transmission, you need to carefully monitor the operation of the car. If the situation repeats, when the transmission delays the transition, you should contact a specialist.

Read

Basic malfunctions and errors of automatic transmission

Shifting from 4th to 5th gear

For automatic transmissions, as well as for manual transmissions, in an urban environment a typical operating mode is when second or third speeds are most often selected. On the first one there is always movement from a place. The mechanisms responsible for changing the 4th and 5th stages are subject to less wear.

Despite this fact, automatic transmissions are delaying the transition for several reasons:

failure of the hydraulic unit;

malfunction of the throttle position sensor (TPS) or the English version of the name Throttle position sensor (TPS);

errors in the functioning of the electronic unit.

Problems with the control unit can be resolved by car service specialists using the on-board computer. In case of some minor failures, it is enough to reset all settings to factory defaults, which will update the system and cause it to work correctly.