Operation Skoda Octavia Tour It is often associated with the need for routine work, especially if the mileage of the car has exceeded the mark of 150 thousand kilometers. One of the most common problems in the transmission is the wear of the drives, namely the inner hinge of equal angular speeds (SRUS). Ignoring the first signs of failure can lead to complete destruction of the knot and jamming of the wheel on the move, which is fraught with serious accidents.
Replacement process internal CV joint This model requires not only a set of tools, but also an understanding of the suspension design. Unlike the external hinge, the internal works at large angles and axial loads, so the choice of spare parts and the quality of the assembly must be approached with special care. The article will help you to diagnose the malfunction and correctly carry out repairs, saving a significant amount on the services of the service center.
Diagnosis of a malfunction of the internal CV joint
Determine that the problem is in the internal joint, and not in the external or bearing of the hub, it is possible for specific symptoms. When driving on a rough road or when you start abruptly from a place, you can hear a rhythmic metal knock, which is amplified when you press the gas pedal. This sound is often confused with the sound of shock absorbers, but when diagnosing it is important to pay attention to the nature of the vibration.
If during a sharp acceleration from the spot there is a strong vibration through the steering wheel and body, and when the gas is discharged, it disappears - this is a sure sign of wear of the internal clip. The external SRUS usually gives clicks when turning the wheels, while the internal knocks when moving straight with load. It is important not to confuse these symptoms with the knocking of the Silent blocks of levers, which can also manifest on the bumps.
- π Rhythmic knocking during acceleration, depending on the load on the engine.
- πͺοΈ Strong vibration of the steering wheel and floor of the cabin at a sharp start.
- π Weakening of traction, feeling of "failures" during acceleration.
β οΈ Note: If you find a torn anther and leaked lubricant during the inspection, replace it CV joint Right away. Sand and dirt trapped inside the mechanism act as an abrasive, destroying the grenade in a matter of kilometers.
Preparation of tools and selection of spare parts
Before starting work, a specialized tool should be prepared. The usual set of keys here will not cope, since the nut of the hub has a huge tightening moment. You will need a powerful collar, a head of 30 mm (or 32 mm depending on the year of release) and a rattle with an extension cord. Also, you can not do without a skipper to remove the ball support and a device for knocking the drive out of the gearbox.
Selecting a new spare part is a critical step. For Skoda Octavia Tour Drives from other models of the VAG group are often suitable, but it is important to check compatibility with the VIN code. Donβt skimp on quality: cheap counterparts wear out quickly, and the original VW Group parts ensure durability. Carefully inspect the new unit for no backlashes before buying.
- π§ Powerful collar with a head of 30/32 mm and an extension.
- π¨ Heavy hammer and mounting shovel for pressing.
- π’οΈ Special lubricant for SRUS (usually complete with a grenade).
- Front
- Full (4x4)
- Back (rarely)
- I don't know
Donβt forget to buy a new stain and a new stain. Old clamps after removal are often deformed and do not provide tightness. You will also need a new hub nut, as the old ones often have residual thread deformation and do not give the desired tightening moment. Quality assembly is impossible without replacing fasteners designed for single use.
Step-by-step instructions for dismantling the drive
Work is better carried out on the lift or observation pit to provide free access to the bottom of the suspension. First, you need to unscrew the wheel and loosen the nut of the hub, without removing it until the end while the car is on the ground. After lifting the car on the jack or lift, you can completely unscrew the nut and remove the wheel for easy access.
Next, you need to unscrew the lower bolt securing the ball joint to the steering knuckle. This will allow you to spread the suspension components and remove the drive from the hub. Be careful: the drive may be thrown out with force, so place a support under it or have an assistant hold it. After this, you need to unscrew the bolts securing the automatic transmission bracket or transfer case, if this is required to access the internal hinge.
βοΈ Preparation for dismantling
The most crucial moment is removing the inner CV joint from the gearbox. Use a pry bar to carefully pry up the drive housing. Do not hit the shaft itself or the box body with a hammer, as this may damage the seal or internal gears. If the drive is stuck, you can gently tap it through a wooden spacer, but it is better to use a puller.
β οΈ Attention: When removing the drive from the transmission, be sure to place a container under the transmission. About 100-200 ml of oil will leak out, and if this is not done, the lubricant level in the gearbox will drop to critical levels, which will lead to overheating of the gears.
Installation of a new CV joint and assembly
Before installing a new joint, thoroughly clean the seat in the gearbox from any remaining grease and dirt. Make sure the oil seal is level and undamaged. The new drive must be inserted until there is a characteristic click, which will mean that the splines are engaged with the differential. Do not use excessive force unless you feel traction.
Assembly occurs in reverse order. First, insert the drive into the hub, then connect the ball joint and tighten its bolt. It is important to properly center the shaft before tightening the hub nut to avoid misalignment. The hub nut must be tightened to the torque recommended by the manufacturer, usually about 200-250 Nm, after which it is necessary to tighten it or install a new locking clip.
- β Check the cleanliness of the seats before assembly.
- π© Tighten the hub nut with a torque wrench.
- π‘οΈ Install a new boot with sealed clamps.
What to do if the hub nut does not unscrew?
If the nut is stuck, use penetrating lubricant (WD-40) an hour before starting work. As a last resort, you can heat the nut with a blowtorch, but be careful not to damage the rubber suspension elements.
After assembly, be sure to check the brake pedal travel and suspension function in place. Spin the wheel by hand to make sure there are no extraneous sounds. Install the wheel and lower the car. At the end of the work, it is necessary to add transmission oil to the gearbox to the required level if it was lost during dismantling.
Proper tightening of the hub nut is a guarantee of safety, since loosening it while driving can lead to the wheel flying out and loss of control.
Torque Chart and Specification
For correct assembly, it is necessary to comply with the technical parameters for tightening threaded connections. Deviation from these values ββcan lead to rapid destruction of the nodes or their self-unscrewing. Below is the current data for most modifications Skoda Octavia Tour with front-wheel drive.
| element | Tightening torque (Nm) | Note |
|---|---|---|
| Hub nut | 225 + 90Β° turn | Just a new nut |
| Ball-support bolt | 25 | + turn 90Β° |
| Lever mounting bolt | 100 | With washer |
| Transmission mounting bolt | 40 | Metric thread |
Compliance with these numbers is critical to the longevity of the assembly. The use of a torque wrench is mandatory, since it is impossible to determine a force of 225 Nm βby eyeβ. This is especially true for the hub nut, which holds the entire drive assembly and bears enormous loads.
Checking the quality of repairs and operating nuances
After completing the work, take it for a test drive. Pay attention to the car's behavior when accelerating, braking and turning. The knocking should completely disappear, and the vibration should disappear. If you feel the slightest deviation, it is better to double-check the tightness of all connections and the correct installation of the boot.
In the first days after replacement, monitor the condition of the new boot. Make sure that it is not twisted or kinked, as this may cause it to break during operation. Inspect drives regularly at every oil change to spot signs of wear.
Before driving after replacement, check the transmission oil level. Its lack can lead to rapid failure of the differential and new CV joints.
Sometimes, after replacement, a wheel alignment may be required, especially if elements of the levers or steering knuckles were removed. This will help prevent uneven tire wear and improve vehicle stability on the road. Do not neglect this procedure if you notice that the car is pulling to the side.
β οΈ Attention: Never use a lubricant other than one specialized for CV joints, since conventional lubricants (such as Litol-24) destroy rubber boots and cannot withstand temperature loads. This will lead to rapid failure of the unit after just a few thousand kilometers.
Common mistakes when replacing an internal CV joint
One of the most common mistakes is trying to knock the drive out of the hub through the shaft itself. This leads to damage to the splines and the impossibility of subsequent assembly. Always use special mandrels or mount through a hub nut if the design allows this.
Another mistake is reusing an old hub nut. Even if visually it looks intact, its thread is already deformed and it will not create the required preload. This may cause the nut to come loose while driving. Always install the new nut purchased with the drive.
- β Reusing an old hub nut.
- β Ignoring the replacement of the boot and clamps.
- β Incorrect drive alignment during assembly.
Conclusion and final recommendations
Replacement internal CV joint on Skoda Octavia Tour - a task quite feasible for a home craftsman if he has the right tools and knowledge. The main thing is to take your time, carefully monitor the condition of all components and observe the tightening torques. A quality repair will extend the life of the transmission by tens of thousands of kilometers.
Remember that prevention is always cheaper than repairs. Regularly inspect the drive boots and, at the slightest sign of damage, change them, changing the lubricant at the same time. This will avoid costly replacement of the entire assembly. Take care of your car and enjoy a safe ride.
Frequently asked questions (FAQ)
Is it possible to replace only the inner CV joint boot?
Technically this is possible, but only if the hinge itself has no play or wear. If, when rocking the shaft by hand, you feel a knocking or jamming, replacing only the boot will not save the situation - the entire assembly will have to be replaced.
Is it necessary to do a wheel alignment after replacing the CV joint?
Typically, replacing the drive itself does not require correction of the wheel alignment angles, since the suspension geometry does not change. However, if you have removed the arms or ball joints, the wheel alignment procedure becomes mandatory.
How much oil will leak out of the box when removing the drive?
The volume depends on the gearbox model, but usually about 100-200 ml of gear oil leaks out. This is enough for the level to drop below normal, so be sure to add oil after assembly to the dipstick mark.
What tool is needed to unscrew the hub nut?
To unscrew the hub nut (tightening torque about 225 Nm), you need a powerful wrench, a 30 or 32 mm socket and a long lever. Sometimes it is necessary to use a pneumatic impact wrench or a special brake disc clamp.
Is it possible to drive with a damaged inner CV joint?
Strongly not recommended. Driving with a faulty inner joint can lead to its complete destruction, wheel jamming and loss of vehicle control, which poses a direct threat to the lives of the driver and passengers.