The technical name of this important detail is the constant velocity joint. While the popular name in all auto repair shops and among experienced drivers is “grenade”. Repairing this important transmission part is one of the most expensive items after gearbox repair. How to save the “grenade” as much as possible, what are the signs of a malfunction. And why is this CV joint installed in the car?
Where is the CV joint installed, and how does it work
CV joints are installed on front-wheel drive and all-wheel drive vehicles with independent suspension. The unit is designed to transmit torque from the gearbox to the wheel hub while simultaneously controlling speed indicators. There are two “grenades” for each wheel: external and internal – the internal part enters the gearbox. And the outer part goes directly into the hub. A fixed axis interconnects both CV joints.
Causes of the malfunction
If there is a grenade in the car, it must explode sooner or later … This is exactly what car mechanics who repair CV joints say, and recently the failure of the speed joint has become much more frequent. The most common causes of failure:
- Dirt. Cracks, ruptures, and depressurization of the anther are the most common cause of failure of hinge failure. During operation, dust and dirt accumulate on the rotary mechanism, and part jamming and breaking occur.
- Aggressive drive. Here we are not talking about a sharp set of speed and a brake, but about a strong start with the wheels turned out. Inexperienced young drivers often demonstrate this style of driving. As a result, the hinge experiences a critical load in the clamped state; a crack may form.
- Gearshift braking. Systematic slippage and braking by the transmission lead to premature wear of the hinge.
- Wrong replacement. When replacing the CV joint, incorrect installation or a low-quality part is possible. In this case, the driver understands that not everything is in order with the new hinge after a few tens of kilometers.
- Backlash on ball bearings. An increasing play occurs in the process of wear of components in the ball bearings, which can lead to rapid wear of the CV joint. If the ball pin pulls out of the seat during the ride, the outer grenade may be broken.
When a part breaks, the grenade bearings begin to lose needles. Small parts can get into the crankcase gearbox, where, together with the oil, they get to the gears. This is one of the most serious cases of repair. Often this will require the replacement of the entire transmission system.
A CV joint failure while driving can result in wheel jams, leading to an accident, especially if the failure occurs on the highway during an overtaking maneuver.[/stextbox]
The axle shaft will need to be replaced.
Repair of the CV joint is far from possible on all cars; often, manufacturers do not even put in the assembly the replacement of the anther, and the entire drive shaft has to be replaced with a new one. It is recommended to inspect the condition of the “grenades” every 5,000 km. Run. During scheduled maintenance, the diagnostics of hinges should be included in the set of mandatory measures.
Car mechanics replace the boot and renew the lubrication packing if there is no severe wear on the part and a crack in the casing is found after an inspection. It is quite difficult to identify the leakage of the anther – most often, drivers turn to the service station after the appearance of characteristic signs of a hinge failure.
Signs of breakdown
The first thing that should alert the driver is the appearance of a slight crunch when reversing with the steering wheel completely turned out. In this situation, the engine runs smoothly, and the uncharacteristic sound from the wheels is heard well in the cab. If you immediately check the assembly, you can get it by replacing the hinge without losing the drive.
If already during normal turns or maneuvering, an uncharacteristic knock is heard in the area of \u200b\u200bthe wheel; this is a sign of significant wear on the part. And if wheel strikes occur during acceleration, specific slippage of the car indicates that several tens of kilometers are left before the hinge is completely jammed.
The hinge is not dangerous – it is a fairly reliable with a large inherent potential. But if you bring the “grenade” to an explosion, this will lead to the fact that buying a new car will become a less expensive option than repairing an old one.