Primary Shaft Bearing

Any mechanical gearbox has in its arrangement a bearing of the input shaft. The primary shaft is one of the leading elements in the transmission. It is necessary for the transmission of torque from the clutch discs to the driven and intermediate shaft. The primary element rotates around its axis due to its bearings. The latter fix the shaft, center it, and also protect the part from vibrations. Also these elements are one of the important links in the ICIE system.

Device

Advantageously, needle bearings are used to support the shaft . The use of thin and long rollers makes it possible to minimize the thickness of the ring together with maintaining high resistance to loads.

The fastening of the part has its own peculiarities. During operation, the element generates its installation site. Due to the growing backlash and vibrations, the part is gradually destroyed, and then it is necessary to replace it.

Symptoms of malfunctions

Signs of failure of this element are strongly associated with the installation site. The bearing of the input shaft of the gearbox is installed on the primary shaft, and behind it is the stuffing box. In various transmission models, the bearing itself can work as an oil seal. So, paired with squeeze, this part experiences almost all the load from the car engine. To find the problem bearing, you need to dismantle the transmission. Symptoms of failure of this element are similar to how any other bearings come into disrepair. With serious breakdowns from the checkpoint, there are characteristic sounds resembling howl. This sound can be heard at the moment when the clutch is released and the car is standing. But also the input shaft bearing can whistle and while driving. Very rarely you can hear characteristic knocking - they talk about the complete destruction of the site.

There are also problems with switching on or not turning off the clutch. The reasons for this work are the bearings in this bearing. A malfunction often occurs if the part is jammed. In difficult situations, it may be necessary to replace the primary shaft. Often the whistling and buzzing is audible in the absence of lubricants in the bearing. This issue can be solved by lubricating the part. But in the beginning it needs to be removed from the gearbox. The transmission will make a howl if the bearing has chips and cracks or one or two rollers are destroyed. If you hear a characteristic knocking, then this indicates a complete failure of the details. The knock will be issued in any program. If you do not replace the worn or damaged parts in time, then the element can seriously "weld" to the shaft. As a result, you will have to change the input shaft bearing and the shaft itself.

Causes of breakdowns

The fact that the element wears out and collapses can be influenced by many different factors. Often the fault is the low quality of the parts. When purchasing a product, you should not give preference to the cheapest options, but it is worth buying a quality product. It is necessary to carefully inspect the assembly and make sure that it is reliable and made of strong materials. Also one of the possible reasons is the manner of driving. If the driver uses a too aggressive style, literally pulling out the shift lever, then this does not add to the bearing of the resource, but seriously reduces the service life.

Still important are the conditions in which the car is operated. If the car is constantly stored in the garage, if there are no overloads, then all this will have the best effect on the resource of each node. And finally, the most popular reason for the failure of the VAZ shaft bearing is the ignoring of the maintenance of the mechanisms and components of the car. Owners of inexpensive cars that use them for work, as well as novice drivers who are just learning, can ignore the maintenance.

How to replace

Replacement of the input shaft bearing can be carried out independently.

It does not require special skills. Also, no special tools will be needed for the work. For replacement, you do not even need to disassemble the box. But the dismantling of the checkpoint is still necessary.

How do I remove the transmission?

To remove the box you need a viewing pit or a lift. Also, you need a standard set of tools - a wrench, heads, wrenches and mounting. The dismantling process is performed in several stages:

1. First of all, disconnect the battery terminal. Then neutral transmission is switched on, the parking brake is switched off. Raise and withdraw the rear axle. Then unscrew the bolts holding the cardan and the flange of the reducer. After that, you can detach the PTO shaft.
2. Then unscrew bolts and dismantle the exhaust pipe of the exhaust manifold, detach the oxygen sensor, remove the starter. Further in the car you need to dismantle the console and the gearbox knob.
3. After that, remove the protection of the box, unscrew the clamps that connect the intake pipe to the catalyst. After that, the clutch slave cylinder can be dismantled. Next, unscrew the speedometer cable, remove the dust guard and the rear transmission cable. Now you can get a cardan shaft. Then untwist traverses (thus it is necessary to hold a box that that has not fallen). Finally, you can unscrew and remove the gearbox assembly.

Where is the bearing, how to dismantle it?

On the domestic production cars, the primary shaft bearing is located on the secondary shaft, directly behind the stuffing box. When the gearbox is completely removed from the car, the bell is pulled out, as well as the locking rings. Next, you do not need to parse the node.

In order to replace the part, you need to use a screwdriver to engage the bearing by its annular groove. Then the primary shaft is pushed forward using the bearing as a support. Then slowly pull the bearing off the shaft, tapping it with a hammer. To hurry it is not necessary. Replacement of the bearing of the input shaft of the VAZ can take from several minutes to one hour.

How to install a new element on the shaft?

The new part on the primary shaft can be installed using the crimping technique. The bearing is heavily lubricated with engine oil, and then pressed with a small hammer.

It is important that the tool is not only small, but not heavy. The hammer must be gently and evenly beat on the inner ring of the part. The shaft is pulled forward. After pressing it is recommended to make sure that the part works normally. The serviceable bearing rotates easily and quietly, without noise. After the replacement of the bearing of the input shaft (VAZ including) is completed, establish a check point to its rightful place. All assembly work should be carried out in the reverse order.

Helpful Tips

If the bearing is completely free of oil, but there is no damage on its surface, then the replacement can be omitted, but with the lubrication and installation back. So do, if for some reason the right spare part is missing on the hands. Lubricate the bearing of the input shaft of the gearbox (VAZ including) in two ways. The first option involves the digestion of the part in lithol. It is best to perform such an operation on a water bath. But there is also a safer option - lubrication by the method of syringing. To do this, the lithol is collected in a syringe and stuffed with a lubricant into the bearing. But you need to take into account that this process requires more time.