Vibration when starting off: possible faults and their elimination

At the beginning of the movement, when you squeeze the clutch pedal, turn on the first gear and release the pedal, vibrations appear when starting from the seat. As a result, drivers for a long time puzzle their head and can not figure out what the essence of this problem is. In fact, there are a large number of causes of vibration when starting from a place. This can be due to the engine, gearbox, and clutch. To fix the problem correctly, you need to study this fault.

Causes of vibration when starting from a place associated with the engine

If the malfunction is connected to the motor, then it is worth checking the integrity of its fasteners to the body of the car.

Broken cushions or broken brackets of their fastenings do not provide the required stability of the engine, accordingly, it begins to shake on the sides, which makes the clutch work more difficult. The same consequences occur when the engine is trod. Therefore, it is necessary to check the efficiency of all its cylinders.

Troubleshooting the Engine

Pre-subdued motor, old, broken pillows are unscrewed. In their place are installed new ones.

Now, if the engine is moving, you need to first determine what is the reason. This is due to a bad armor, a defective spark plug or the wear of one contact in the interrupter-distributor. In the case of an injector engine, the nozzle may be clogged. Determine which of the cylinders does not work, you can in a simple way - alternately removing the armored car from the candle and listening to the motor's reaction. If the engine starts to work with even greater interruptions, then this cylinder is OK. If, however, he did not react after removing the armored tube, then this cylinder does not work. Now, having determined the non-working cylinder, you can begin to search for the reason for his refusal to work and eliminate this problem.

Vibration associated with adhesion

Very often a strong vibration when starting from the seat occurs with malfunctions with the clutch. This can mean a strong wear of the pressure plate and release bearing. The resource of these elements is about 100 thousand kilometers. Over time, the bearing starts to hum, and the disc - to burn.

As a result, the clutch slips out of the load, because at the start a large force is applied to it. It is thanks to the disc that you can move the car from its place. Significantly reduces the life of the element on commercial vehicles, as they have to start with an additional load. Typically, the cohesion resource on the car type "GAZelle" is 20 000 km. Malfunctions related to the clutch release (such as cable breakage, wear of the rubber cuffs of the working or master cylinder, wear of the hose, air in the system) do not allow the clutch to be properly switched off on the vehicle. Maybe it does not turn off at all. As a result, the first transmission is difficult to switch on. This indicates that the system is airborne.

Vibration may occur during power-up. To ride with such a malfunction is not worth it. More common situation - the vibration of the car when starting from the seat just after the replacement of the clutch. In this case, there may be a poor tightening of the clutch bolts , incorrect alignment of the clamping plate . This prevents the input shaft of the gearbox from engaging with the splines of the release disc. Such consequences still arise as a result of breakage of the petals of the diaphragm spring or damper elements in the torsional vibration limiter.

Troubleshooting clutches

In case of drive failure, it is necessary to replace its damaged parts: cable, or, if the clutch release actuator is hydraulic, then worn rubber cuffs, springs, hoses or the main and working shut-off cylinder assembly.

It is recommended to install the master cylinder or the working cylinder as a whole. Replacement of rubber cuffs will only solve the problem for a short time. After all, the working surface of the liner inside the cylinder is already worn out, and it will only speed up the wear of the new cuff. After work, it is necessary to pump the hydraulic system, so that there is no air left in it. Because of it, the clutch release operation will be incorrect. In the event of breakage of the petals of the diaphragm spring or damper springs of the torsional vibration limiter, the clutch must be completely replaced with the basket. When installing a new unit, be sure to center the pressure plate.

This is done using a special mandrel or primary gearbox shaft for this vehicle. The mandrel is inserted into the pressure plate and diaphragm spring, and only then the clutch basket is screwed to the engine flywheel. Then it is well and evenly tightened to prevent the screws from loosening during operation.

Shocks associated with the gearbox

In the case of a transmission failure, vibration can also be felt when starting off. They are associated with badly worn synchronizers inside the box. As already described, during the start, there is a large load on the clutch and the gearbox. With worn synchronizers, the first gear will be difficult to turn on. Do not exclude the malfunction of the gears gearbox. They can slip, in connection with which there is a vibration on the body.

Transmission fault rectification

The first difficult task is to dismantle the gearbox from the car. Depending on the drive of the car, the job of removing the transmission is different. Before you start, you must always drain the oil from it. On the rear-wheel drive car, the cardan is first unscrewed, the shift lever, and then the gearbox itself is unscrewed from the engine. In the case of a front-wheel-drive car, the hinges of equal angular speeds are loosened and removed , the shaft connecting the shift lever to the box is dismounted. And only then the transmission is unscrewed from the engine and removed.

Having disassembled the gearbox, you need to inspect the gears and synchronizers for signs of wear. Damaged and worn parts should be replaced. At the end of the work, everything is assembled and installed in its place in the reverse order. When the gearbox is standing still, the ideal option is to replace the oil in it.

Vibrations that are transmitted to the steering wheel

Vibration of the rudder arises as a result of kickbacks of the body due to the occurrence of all of the above faults. However, such a problem can arise in the case of malfunctions of the steering itself, namely with the wear of the parts of the rack mechanism, depending on its type or the breaking of the trapezium's fastenings. Below we will consider this problem in more detail.

Troubleshooting steering problems

If the type of screw-nut mechanism, then during the long-term operation wear of friction parts increases the gap between the worm and the driven gear. Eliminates by tightening the adjusting bolt in the cover of the body of the steering gear and using a quality grease. The main thing - do not tighten the bolt during tightening. Otherwise, the rotation of the steering wheel will be difficult and the wear of parts will only increase.

If the type of gear is gear-rake, then a strong wear increases the gap between the pinion of the rack. The fault is also removed by tightening the adjusting bolt. However, there are such mechanisms where there is no adjustment of the gap. They are replaced in the collection, or dismantled and polished on machine tools. Poor attachment of the steering trapezium supports is caused by poor tightening of the bolts. Also, this breakage of the bracket or, in rare cases, the spar. Eliminates the tightening of bolts and welding of broken parts. What to do if there is vibration when starting from the place (VAZ 2101-2109)? Let's consider below.

Cars of the VAZ family

On VAZ vehicles, vibrations occur for the same reasons associated with a malfunction of the engine mounts, the engine itself, the gearbox and the clutch. In the event of a vibration, you need to check the car aggregates for malfunctions and eliminate them.

Vibration when starting from the place of automatic transmission

In the automatic gearbox, shocks at start-up occur when the clutches, clutches and gears of the planetary gearbox are heavily worn. Also, the matter is in the malfunction of the hydromechanical transmission and the electronic control system inside the gearbox or in dirty oil channels coming from the pump. This is caused by improper operation and use of a poor quality lubricant.

Strongly worn friction parts begin to slip when the gearbox is loaded. Failure of the valves of the electronic control unit does not give rise to the desired oil pressure in the system, and during the torque converter malfunction the torque is badly transmitted from the engine to the gearbox. This is caused by the strong play of the shaft bearings, as well as the breakage of the petals of the drive and driven gear of the torque converter.

Troubleshooting the automatic gearbox

Before starting repair it is advisable to go to the maintenance station and diagnose the box for errors. Malfunctions of an automatic box of a gear change by search of the worn out and faulty sites, then their replacement are eliminated. Change is only for quality parts from original manufacturers. Do not buy cheap analogs. During the replacement, it is also worth paying attention to the bearings. Otherwise, a new part can fail before its term.

To repair it is necessary to approach in a complex, especially in a case with an automatic transmission. Here you need to go through all the details for wear and looseness, replace all rubber products, such as:

• Oil seals.
• Cuffs.
• Rings.
• Gaskets.
• Sealants.

At the end of the repair, you must replace the oil in the gearbox.

Also at the service station, carry out diagnostics and reset errors stored in the archive of the electronic control unit. In the future, you should carefully maintain the gearbox, avoid jerking during the start, do not overclock the car abruptly, and hold the brake pedal depressed for about one or two seconds before the start of the movement so that the pressure required in the oil system forms.

Conclusion

That in the future there were no extraneous noises and vibrations when starting from a place, you need to carefully monitor the condition of the units and assemblies of the car, in time to serve them, using only quality lubricants. And in the event of malfunctions or breakages immediately eliminate them and approach to work with responsibility. Use of substandard spare parts can worsen the situation and provoke the wear and tear of other mechanisms of the car.