Removing and replacing the speedometer drive of a VAZ 2109
We remove the speedometer drive on a VAZ 2109 car to replace the housing, sealing ring or the drive gear itself. Its removal can be done without dismantling the gearbox itself; to do this, the car must be driven onto an inspection hole or overpass. The repair procedure is as follows:
- Using a socket wrench, unscrew one bolt securing the speedometer drive housing to the gearbox and pry it off with a flat-head screwdriver.
- Now you can remove the driven gear itself. This gear is made of plastic, so it must be carefully inspected and if signs of wear are found, replace it with a new one. Also pay attention to the seat where the tip of the speedometer flexible rod is inserted; it should not be broken with licked corners, otherwise this defect is also the reason for replacing the gear.
- Pay attention to the box body where the drive is installed. If traces of oil leaks are noticeable, then it is necessary to replace the rubber sealing ring located on the drive housing. To remove it, you need to remove the driven gear and then push out the O-ring.
- Wash all parts in clean kerosene.
At this point, the repair work on removing and repairing the VAZ 2109 speedometer drive is completed. After washing all the parts, reassemble it in reverse order and install it in place.
Replacement
If you want to save money and want to try to repair the old speed sensor first, we hasten to disappoint you.
We remove and change
The speed sensors installed on the VAZ 2109 (as well as on other cars) cannot be repaired or restored. The only way to solve the problem is to replace the device.
We got to DS
After completing the repair, be sure to reset the error that was generated by the electronic control unit on the on-board computer. Otherwise, the system will assume that the sensor is faulty. Therefore, even its presence in the socket will not allow the DS to start working.
Obviously, there is absolutely nothing complicated about replacing the DS. Therefore, it makes no sense to spend extra money on car service services. Everything can be done with your own hands in literally an hour.
Source
Speedometer drive: types and differences
A speedometer is an important element in cars, as well as several other vehicles, as it is necessary to monitor speed in order not to violate traffic rules. But this is not the last function of this device.
All possible speedometers have a high-speed magnetic unit; due to the rotation of the magnets, a flow is formed, it moves through the coil, thereby facilitating the induction of eddy currents. They thereby begin to create more magnetic fields. They interact with each other, the needle of the device moves along the frequency scale, with the help of this the magnet rotates.
All speedometers are divided into three categories.
- Mechanical speedometers.
- Electromechanical speedometers.
- Electronic speedometers.
Mechanical speedometers. In this type of speedometer, the process of speed measurement and indication occurs thanks to a mechanical device. A gear is used as sensors, which is connected to the secondary shaft of the gearbox; this is the speed unit with an arrow indicator and the drum counter. Previously, speedometers were used in the form of a drum and tape. But they stopped using them quite a long time ago.
Electromechanical speedometers. In these devices, speed is measured using various electronic or electromechanical sensors that are connected to the gearbox. The speed is indicated by a milliammeter or the speed unit of a mechanical speedometer, and the distance is indicated by a counting drum, which drives a stepper motor.
Electronic speedometers. This is a development of new electromechanical speedometers; the main difference is the replacement of the odometer - in an electronic device it is completely digital.
How to remove the speedometer drive with your own hands - instructions
VAZ 2110
- We support the anti-rollback shoes of the rear wheel, then we need to jack up the front of the car, and then install it on supports.
- On a model with a cable-driven speedometer, remove the fastening pin and disconnect the cable from the gear drive.
- Unscrew the fastening bolt and remove it together with the heat shield.
- Remove the drive with the gear from the crankcase and remove it from the seal ring.
- The gear can be removed from the gearbox housing; be sure to check the condition of the gear; if defects are detected, it must be replaced.
- If there are signs of wear or damage to the gear, the condition of the gear should be checked.
- To remove the gear, release it from the transmission. Then you need to unscrew the mounting bolt and remove the drive gear housing. Then you should remove the drive gear and remove all the adjusting washers.
VAZ 2107
- Using a “13” wrench, you need to unscrew the bolt of the clamp securing the exhaust pipe of the muffler.
- Take a 10mm wrench and unscrew the drive fastening nut.
- Using a 13mm wrench, unscrew the two nuts securing the cross member.
- Then you need to lower the rear of the transmission.
- The pipe section must be moved to the right and then the speedometer drive must be removed from the crankcase hole.
VAZ 2114
- We unscrew the DS counterclockwise.
- After removing the DS, check the VAZ 2114 speed sensor drive.
- Using a “10” wrench, unscrew the nut and pull it out.
- After removing the drive, you need to check the condition of the ring and, if necessary, replace it.
Do-it-yourself repair of the VAZ 2109 speedometer drive
The speedometer of this car model is equipped with a mechanical drive. The installation of gears, including the drive gear, is carried out on the secondary shaft of the box. The transmission of torque to the speedometer, which is located on the dashboard, is provided by a flexible shaft.
One of the features of the car model is that the equipment can have either a high or low dashboard, which in turn means that when purchasing a flexible shaft, you need to make sure that its length is suitable for your car.
Peculiarities
The speed counting system of the 09–99 family has several design features. They are connected to the dashboard of these cars. Over the years, manufacturers equipped these models with 3 types of panels. It is especially important to understand their nuances. The choice of components when replacing faulty parts depends on them.
Low
This dashboard was the first modification. One of its features is the absence of a tachometer. As for the speedometer, its system is completely mechanical. It works due to transmission rotation from a mechanical drive, through a flexible shaft to the speedometer itself.
Cars with a low panel were equipped with flexible shafts (cables) 80 centimeters long. The drive gear is also different. It has 8 teeth, which is 4 less than the tall panels. The correct calculation of the speed of movement depends on the number of teeth on the gear.
High
The high panel replaced the low one. The main difference is the absence of a voltmeter and the presence of a tachometer.
The speedometer system remains the same - mechanical. The difference from cars with a low panel is the length of the speedometer cable, it is 1 meter. It also uses a longer drive rod and changes the number of teeth from 8 to 12. This is a significant difference.
Europanel
This panel is already equipped with injection models of the VAZ-2109. Its peculiarity is the complete absence of mechanical drives. The speedometer system is also modernized. Now the mechanical drive has been replaced by a magnetic sensor, a flexible shaft, electrical wires, and the drive of the speedometer itself has become electronic. Complete difference from carburetor models. The work is carried out without gear rotations, which has significantly reduced the percentage of errors in calculations.
Before you figure out why the speedometer does not work, you need to understand the principle of its operation on cars with different layouts.
How to check the speedometer shaft?
Usually, to check the functionality of the shaft, it is enough to drive a couple of tens of meters. Start the engine and drive 20–30 meters and observe the behavior of the end of the shaft. If the tip is motionless, you need to lift the hood cover, unscrew the nut that secures the shaft. If only the shell of the part gives in, then this will indicate only one thing - a shaft break has occurred. In this case, you will have to remove the remaining tip from the drive. For this job you will need pliers.
Another development of events is also possible if both the shaft and the shell fail, and this will indicate that there are simply no edges at the tip of the shaft. Regardless of the reason for the shaft failure, it will have to be replaced.
Often the need to change the drive arises due to wear of paired gears. In order to solve this problem, you do not have to remove the gearbox. To solve the problem, it is enough to have an inspection hole or overpass.
The first step is to unscrew the bolt that secures the drive housing to the gearbox. After this, the housing is removed, then the gears. The latter must be replaced. In order to choose the gears that are suitable for your car, just compare the new ones with the old ones, the number of teeth should be the same.
If there is oil on the housing, it would be a good idea to check the O-ring and replace it if necessary. The drive elements are washed using clean kerosene.
The order of assembling the unit is reverse.
How to check the device
To check the condition of the speedometer, you will need to drive the car onto an overpass or into a garage with a pit. You must have access to the bottom of the VAZ-2109 so that you can unscrew the cable fastening. Also invite an assistant who will turn the cable in different directions or monitor the instruments. The car enthusiast himself cannot simultaneously read the readings and be under the bottom of the car.
The results could be like this:
- the arrow moves - the cable is intact, the problem should be looked for in the device drive;
- the pointer twitches - the flexible shaft is worn out and needs to be replaced.
If the problem is in the drive, then it will have to be removed to repair it. Only then will you be able to diagnose the problem. You will have to follow the instructions:
- lower the cross member to secure the gearbox;
- use a flat screwdriver to pry out the drive frame;
- move the box aside to gain access to the speedometer gear assembly.
Now you can run the diagnostics. First, try turning the gear. If the speedometer cable socket does not rotate, then the entire drive will have to be replaced, not forgetting to lubricate the part. In other cases, you can try to repair it.
If you buy a new speedometer drive for the VAZ-2109, then take the old part with you. You need to count the number of gear teeth on it in order to buy a similar model. If you do not take care of the number of gear teeth, then during the break-in of the new part your speedometer drive will be torn out, and then the transmission will fail.
How to recognize a faulty speedometer?
- The speed is displayed incorrectly;
- The numbers stop crooked;
- The sensor has burned out.
The main condition for success is the correct dismantling of the front panel. Let's consider the sequence of work. A pair of screws are unscrewed, which serve to fix the bottom panel, and the “beard” is removed. The top panel is released from the clamps, and the emergency lights are turned off. This applies to side lights, low beam, and cigarette lighter. Next comes dismantling the pads and removing the panel itself. There is now free access to the screws securing the speedometer.
Thank you for your attention, I hope the article was useful for you, see you again at VAZ Repair.
VAZ 21099 - removing the speedometer drive mechanism
Removal and subsequent replacement of the speedometer drive mechanism on a VAZ 21099 car can be performed without dismantling the gearbox. To carry out repair work, prepare a set of keys and a new drive, then perform the following sequence of actions:
- First of all, clean the drive surface from dirt, then disconnect the flexible speedometer cable from it.
- Using a socket head, unscrew the nut securing the drive housing to the gearbox, then pry it off with a flat screwdriver and carefully remove it.
- Disconnect the driven gear and shaft from the drive.
- Next, use a suitable rod to push the rubber O-ring out of the body.
Now that disassembly has been completed, wipe all parts with a rag soaked in kerosene or gasoline, and then conduct a visual inspection of all elements for mechanical damage. Pay special attention to the gear with the shaft, since it is made of plastic, the shaft itself is most often subject to damage, so that its edges are not licked off. Replace all rubber seals if they have lost elasticity or become dry.
At this point, the repair work to remove the speedometer drive mechanism on the VAZ 21099 car has been completed. After repairs are completed, perform installation in reverse order.
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Principle of operation
The operation of the speedometer system on carburetor and injection models is radically different. Let's describe the main differences.
Carburetor models are equipped with a fully mechanical filling. The speedometer drive is installed on the gearbox. The drive has a rod with a gear, which rotates by working together with the manual transmission transmission shaft. This rotation is transmitted to a flexible cable, which rotates the drive on the speedometer itself. There are some errors in this system. Correct counting may be affected by stretching or snagging of the cable.
Injection models are not equipped with a mechanical drive. They have a magnetic drive. Also installed on the gearbox. It works on the principle of a Hall sensor. During the rotation of the secondary shaft in the gearbox, energy is transferred to the sensor, inside of which the rod rotates. The rod rotates the contactor, which converts the rotational energy into electrical impulses. These impulses pass through wires to the on-board computer and, after recalculation, enter the electronic speedometer drive.
Each type of speed calculation has a number of its own malfunctions and symptoms that precede them. Each problem will be described in detail below.
