The constant velocity joint performs the transmission of torque to the wheels. Abbreviated as SHRUS. By itself, this device is quite simple. It is a ball bearing that rotates not along its axis, as occurs in most similar devices, but across. By its appearance, it resembles an anti-tank grenade, therefore it received a similar nickname "grenade" among the people.
Thanks to SHRUS, front-wheel drive cars were born again at one time, since before the creation of this device, engineers could not come up with a practical technology that would transmit torque with sufficient force when turning to the front wheels. And SHRUS made it real.
When the “grenade” fails, it emits corresponding sounds that cannot be confused with the sounds made by another spare part. This is a knock or crack that sounds when starting off or when making a turn. If you hear such sounds - undoubtedly, you need to change this detail. The reason is that there is no lubrication. SHRUS should be constantly lubricated. Also, this can also occur due to the fact that the driver starts abruptly when the wheels are turned out or turns at high speed.
SHRUS is not subject to repair . When it fails, it must be replaced. If you have a question “how to replace the grease?”, Discard it immediately. In "grenades" should be only the grease that is provided for it. Graphite grease is absolutely not suitable for this . Its use is provided for completely different purposes. But some "wise men" stuff the SHRUS with it. I repeat, in “grenades” there should be only SHRUS lubricant. If you do not take these points into account, you can go to the service station on a tow truck.
SHRUS grease is in the "grenade", as a rule, the entire period of operation. But it happens that she leaves from there. The reason is the spoiled boot CV joint. His task is to delay this lubricant. If this is detected in time, then mechanisms can be saved, for which the boot changes and a new SHRUS lubricant is packed. But first, you need to remove the old as much as possible, because it already contains dust and sand, which contribute to the rapid destruction of parts.
When you choose a lubricant for SHRUS, pay attention to indicators of water resistance, mechanical and antioxidant stability, extreme pressure properties, and also volatility. The better they are, the greater the guarantee that your “grenades” will serve you faithfully for a long time.
How to change the boot CV joint? At first glance, it might seem that the procedure is quite easy, but this is only at first glance. After all, you need to drain the oil, unscrew the wheel, loosen all the bolts, etc. If you have experience in this matter, then you can handle it, and if not, it is better to contact special workshops. After all, if you make a mistake, the boot will not provide tightness, and this is already fraught with sand and dust getting into the lubricant, which will very quickly lead to the failure of the entire SHRUS. Then you will have to pay for the repair much more than the master when replacing the boot.