Replacing the bearing of the secondary shaft of the VAZ 2107 gearbox

The gearbox on the VAZ classic (which includes the “seven”) is particularly reliable. Often the gearbox “survives” 1-2 engine repairs before it has to be repaired. But sooner or later, her turn comes. One of the gearbox parts that most often requires replacement is the VAZ 2107 input shaft bearing .
The reason for its premature failure may be a factory defect or extreme driving style. If you “tear the gearbox lever”, constantly overload it with sudden accelerations or heavy loads when towing, even a high-quality bearing will not be able to hold out for long. Another reason for bearing failure may be neglect of regular gearbox maintenance regulated by the manufacturer. Many believe that replacing the input shaft bearing requires complete disassembly of the gearbox and prefer to entrust this operation to specialists at a service station. But practice has shown that complete disassembly of the gearbox is not required. You can change the input shaft bearing yourself without seriously disassembling the gearbox, and the operation does not require the highest qualifications or special devices and tools.

First stage. Removing the gearbox from the car

Repair of the VAZ 2107 gearbox must be carried out when the first signs of a malfunction appear. For repairs, it is necessary to remove the gearbox from the vehicle.

On a note. It is quite difficult to do this alone. Therefore, it is advisable to have an assistant so that everything goes smoothly.

the first thing to do is to lift the vehicle above the pit or onto an overpass;
disconnect the wire with a minus sign that goes to the battery;

Do not forget that on VAZ cars, for repairs, the radio panel must be removed.

press the box lever;
a screwdriver is inserted into the marked hole. It has a bushing that is of the locking type;
the screwdriver needs to be moved down;
remove the sleeve from the rod;
we separate this rod located on the RPP.

the rubber bushing of the damper is removed from the rod using pliers;
then you need to unclench the petals that grip the damper bushing, then you need to remove them from the lever (see the figure).
then the damper spacer bushing is removed;
the floor upholstery moves;
the bolts that secure the cover covering the hole are unscrewed;
the lever is removed simultaneously with the foam rubber seal;
the receiving pipe is removed from the device releasing gas;
we climb under the car;

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the starter is removed;
the “cross” is removed;
the support cross member of the power device is disconnected;
it is necessary to remove the flexible shaft, which is connected to the speedometer drive;
The hydraulic drive cylinder must be separated from the crankcase. Important! The hose attached to it does not need to be touched;
remove the bolts securing the clutch housing cover using a ten key;
it is necessary to install a support under the gearbox;
you need to take an extension cord and put it on a 19 socket type key;
using a key and a “cross” hinge, you need to unscrew the bolts securing the cylinder block with the clutch;
using a screwdriver that was inserted into the gap, it is necessary to press the clutch away from the cylinder;
remove the starter from the directional bushings;
the input shaft of the VAZ 2107 gearbox must be removed from the driven disk hub;
we displace the primary shaft from inside the bearing ring located in the crankshaft;
and finally, remove the gearbox from the car.

Rear axle drive gear bearings

The VAZ 2107 passenger car has two rear axle drive gear bearings: front and rear.

Rear axle drive gear front bearing

The front bearing of the rear axle drive gear is roller, bevel.

Article number of the front bearing of the drive gear of the rear axle VAZ 2107:

Designation VAZ - 2101-2402025;
Manufacturer's designation: 6-7705U.

Dimensions of the front bearing of the rear axle drive gear:

Outer diameter D - 57.15 mm;
Inner diameter d - 26 mm;
Height h - 17.46 mm.

Rear bearing of the drive gear of the rear axle VAZ 2107

The rear drive gear bearing of the rear axle is roller, tapered.

Designation of the rear bearing of the drive gear of the rear axle 2107:

VAZ classification - 2101-2402041;
The designation of the bearing plant is 6-7807U.

Dimensions of the rear bearing of the rear axle drive gear:

Outer diameter D - 73 mm;
Inner diameter d - 35 mm;
Height h - 27 mm.

Second phase. Disassembly and direct repair

Before starting repairs, it is necessary to clean the outer part of the gearbox using a brush and rinse it with kerosene. Now we can begin. The fork that disengages the clutch and the release bearing in the clutch is removed from the gearbox. We separate the secondary shaft from the propeller shaft and disconnect the edge of the EF from the secondary shaft. Then we separate the entire power unit block. We remove the speedometer drive.

It is necessary to remove the cuff from the ball joint;
Unscrew the three fastening nuts that secure the shift lever to the rear of the crankcase;
The sealing gasket is removed from the stud;
Using a socket-type wrench, loosen the nuts that secure the supports (bracket) of the exhaust pipe;
This support is removed and the bolt that is located between them is removed;
The nuts that secure the cover from the back must be unscrewed using a thirteen wrench;
Using a 10mm socket wrench, unscrew the 10 nuts securing the bottom cover of the box;
After which the cover is removed and the gasket is removed from under it;

If the nuts are turned out at the same time as the studs, it would be wise to use fixing glue. Before applying it to threaded holes and studs, they must first be washed with solvent. After completing this procedure, you need to take a 30mm wrench and unscrew the nut that secures the back cover. You can see it inside the crankcase itself.

Then you need to remove the back cover. Important! It is necessary to put in second gear. We take out the plug made of plastic, which is located on the back of the lid; using tweezers or tweezers, you need to remove the thrust ring. And finally, we take out the secondary shaft ring, which is located inside.

Sometimes it becomes necessary to replace bearings. So, replacing the VAZ 2107 gearbox bearings will be carried out according to the following algorithm:

The retaining ring is removed from the holder located outside;
Using a puller, the ring is removed;
Then we take out the old bearing and insert a new one, after which we put the retaining ring in place.

This completes the disassembly of the VAZ2107 gearbox. Now you can replace all unusable parts.

The vehicle's transmission helps transmit the required torque to the vehicle's wheels in accordance with the vehicle's speed. In this article we will look at what a gearbox secondary shaft is, and also touch upon such important parts as the bearing, secondary shaft oil seal and their replacement.

Operating principle and design of the secondary shaft of the gearbox?

The gearbox consists of many parts that are connected to each other, allowing them to interact and ensure reliable transmission of torque. Initially, the torque is transmitted from the clutch disc to the gearbox input shaft. The primary shaft has a short length and a common fastening device with the secondary shaft. However, there is no rigid mechanical connection between these two parts, and they rotate independently of each other. The third element of the transmission is the intermediate shaft, which is located under the primary and secondary shafts.

All these elements have a large number of gears, each of which, paired with the other, forms a gear ratio, and the pair, in turn, forms a gearbox stage. The intermediate shaft provides connection between the primary and secondary shafts through certain gear ratios. It is on it that the gear ratios change and, as a result, the gear changes when driving.

The output shaft plays a concluding role in the gearbox. It transmits the converted torque to the shank, and then it goes to the driveshaft of the car. Thus, the secondary shaft provides connection between the gearbox and the chassis of the car, and the level of its operation determines whether the car will move or not.

Replacing the bearing and oil seal of the secondary shaft of the VAZ 2107 gearbox

The bearing of the secondary shaft ensures free rotation of its end in the place where the shaft already leaves the gearbox. From the inside, the bearing is filled with a lubricant, which facilitates the rotation of the part.

The gearbox secondary shaft oil seal is installed in the same place. The oil seal is a rubber O-ring that fits onto the shaft and fills the gaps between the shaft and the transmission housing. The oil seal is designed to prevent oil leakage and ensures the tightness of the system.

Over time, both the seal and the bearing are subject to natural wear. Parts of the bearing are destroyed and begin to loosen the shaft. Gradually, the friction between the parts increases, and the bearing begins to disrupt the shape of the shaft. The balancing of the shaft becomes unbalanced over time and it begins to vibrate. The very first to suffer is the oil seal, which will lose its shape and will no longer be able to hold oil in the gearbox. The oil gradually disappears and the lubrication of gearbox parts is disrupted. In addition, the oil seal may fail due to wear, which occurs in any case. The fact is that a rubber product has a certain service life, which is determined by mileage and the oil seal begins to crack and also lose its sealing properties.

You can diagnose a seal malfunction visually. To do this, it is enough to look from time to time at the junction of the cardan and the secondary shaft. If traces of transmission oil are found there, then we can confidently say that the oil seal has become unusable and needs to be replaced.

Bearing failure is quite difficult to determine. To do this, you need to have good hearing and know your car perfectly. When driving in gears, a hum and vibration may appear from the gearbox; when the clutch is depressed or the gear is disengaged, the hum disappears, but this sound should not be confused with the sound of a faulty clutch release bearing or gearbox input shaft.

Causes and symptoms of bearing failure in manual transmissions

Bearing units in a manual transmission perform the function of rolling bearings, therefore, if the rolling bearing is faulty, there will be difficult rotation of the elements, an imbalance will appear, as well as radial and axial runout, backlash, noise, and knocking.

The bearing hums, the noise increases when the clutch is disengaged;
Difficulty switching gears;
Spontaneous transmission shutdown;
A knocking noise is heard when pressing the clutch pedal.

Expiration of product service life;
Poor quality ball bearing;
Wear or runout;
Aggressive driving style and gear shifting;
Insufficient amount of lubricant on the bearing or its absence;
Dirt or abrasive particles getting inside the ball bearing;
Malfunction of adjacent components (releaser, clutch, secondary or intermediate axle).

After removing the axle from the axle, you need to make sure that the part is faulty. To do this, check the ease of rotation of the part, and also do a visual inspection, namely, the presence of damage to the rings, cage, as well as defects in the raceway. If the product is in good condition, it is advisable to take measurements of the axial clearance and radial clearance, as shown in the video.

Video: “How the VAZ 2107 input shaft bearing hums”

Video: “Bearing play in the input shaft of the VAZ 2107 gearbox”

Step-by-step replacement instructions

The car must be driven onto a pit or overpass. The most important requirement will be that he must be immobilized for safety reasons. To do this, install wheel chocks under the wheels or block the wheels using the hand brake.
Prepare the gearbox for removal. Without this operation, replacing the oil seal and bearing is impossible. First, disconnect the ground or negative terminal of the battery. Now find the shift lever inside the car, push it down and use a screwdriver to release the locking sleeve. The lever should come out. After this, release the remote plastic sleeve using two screwdrivers, which need to be used to release the special fastening tabs. Then, go down under the car and remove the exhaust pipe, as it will interfere with further removal of the gearbox.

In the same place, on the gearbox, disconnect the special block of the two wires that are responsible for turning on the reverse lights. Unscrew the universal joint drive mount, the starter mount, release the clutch release hydraulic cylinder, but do not unscrew the hose from it to avoid subsequent bleeding of the clutch, and remove the flexible speedometer cable.
Now the most important thing: unscrew the fastenings of the cross member holding the box at the back, and place any support under the gearbox so that it does not collapse when unscrewing the fastenings to the engine. Unscrew the corresponding fasteners and remove the gearbox from the support.
Disassemble the gearbox, but before doing this, all the oil must be drained from it. Once the transmission is completely disassembled, locate the bearing mounted on the shaft and press it out using a puller. After this, install a new bearing in the same way and change the oil seal.

By the way , the oil seal can be replaced without removing the gearbox; to do this, just unscrew the crosspiece and simply replace the rubber seal with a new one. Don't forget to also drain the oil before carrying out repair work.

Reassemble the gearbox in reverse order and install it on the car.

At this point, the replacement of the oil seal and bearing of the secondary shaft of the VAZ 2107 gearbox is completed. If you are not fluent in tools and do not understand the structure of a car transmission at all, then it is best to entrust this task to professionals from the field of car maintenance.

Cardan joint bearings

Bearings for cardan joints, roller, needle, cardan.

There are 2 pieces on the car.

Designation of the VAZ 2107 universal joint bearing:

VAZ classification - 2101-2202025-01;
According to the manufacturer's classification - 904902K5S14.

Note! Designation of a bearing without a cross.

Cardan joint bearing dimensions:

Outer diameter D - 23.8 mm;
Inner diameter d - 14.7 mm;
Height h - 13.1 mm.