What s going on when the car starts loose and the clutch goes away?

Generally because of the clutch.

Abnormal noise caused by wear or jamming of the separation bearing, separation lever pin and loose pin hole due to wear, and wear of the transmission pin and pin hole. It is recommended to inspect and repair it in a timely manner.

1. When the clutch is about to be combined, you hear a sharp whistling.

Step on the pedal, the sound disappears, and the relaxation pedal appears again, which is caused by the broken steel plate of the driven disc or the exposed rivet head scratching the pressure plate or flywheel, which should be overhauled.

2. At the moment when the clutch is combined or separated, if the clutch emits a "click" and "resist" metal impact sound, and it is more obvious when the heavy car starts, it is the spline of the driven disc.

The hole and its shaft are matched with the plate, and when it is serious, it should be overhauled or replaced; If you hear a "click" sound, it is the sound of the driven friction plate loosening on the steel sheet or the impact between the separation lever and the window hole.

3. The clutch pedal is lifted at a very slow speed, and the vehicle crashes into the start, making a "pop" sound. This is caused by the sudden engagement of the main and driven parts, and the reasons come from two aspects: first, the rod train transmission is stuck, so that the pressure plate is suddenly pressed to the driven plate, causing the car to break in; The second is that the driven disc is deformed or the friction lining is stained with oil, which causes the clutch to continue to engage and cause collision.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that they lack their own understanding of mechanical knowledge, so they can distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

Hello, the current number of people consulted may not reply in a timely manner, if it is a vehicle failure problem, it is recommended to use the computer to detect the specific cause of the failure, search for "car master" can be consulted at any time to ask the car to ask the question, 24 hours ** answer.

Phenomenon: clutch abnormal noise.

An abnormal rattle when the clutch disengages or engages.

2 Causes. 1) Lack of lubricant in the release bearing, resulting in dry grinding or bearing damage.

2) There is no clearance between the release bearing and the inner end of the release lever.

3) The oil stain and dust between the separation bearing sleeve and the conduit are serious or the separation bearing return spring and pedal return spring are fatigued, broken and falling off, so that the separation bearing return is not good.

4) Driven disc splines.

The hole fits loosely with its splined shaft.

5) Driven disc damping spring annealing, fatigue or breakage.

6) The rivet of the friction plate of the driven disc is loose or the rivet head is exposed.

7) The pin holes of the transmission pin of the double-piece separation and closing device and the intermediate pressure plate and the pressure plate are worn loosely.

Diagnosis and exclusion.

1) Press the clutch pedal slightly, so that the release bearing is in contact with the release lever, if there is a "rustling" sound, it is the release bearing sound; If the wheel still rings after refueling, it means that the bearing is excessively worn, loose or damaged, and should be replaced.

2) Press and lift the clutch pedal, if there is an intermittent collision sound, it means that there is a series of movements before and after the release bearing, and the return spring of the release bearing should be replaced.

3) Even when the pedal is pressed, if there is a sound when the clutch is just engaged or just separated, it means that the driven disc rivet is loose or exposed, and the driven disc should be replaced.

There are 2 possibilities for this point of failure:

If it is issued in the engine compartment, it may be that the release bearing in the clutch system is faulty, or the release bearing may be worn, resulting in abnormal noise, and it is recommended to check this part.

If it is the abnormal sound of the clutch pedal in the cab, it may be caused by the lack of lubricating oil in the clutch pedal return spring.

The clutch is located in the flywheel housing between the engine and the gearbox, and the Qiyi Royal clutch assembly is fixed on the rear plane of the flywheel with screws, and the output shaft of the clutch is the input shaft of the gearbox. While the car is moving, the driver can press or release the clutch pedal as needed to temporarily separate and gradually engage the engine from the gearbox to cut off or transmit the power input from the engine to the transmission. The clutch is a common component in mechanical transmissions, allowing the transmission system to be disengaged or engaged at any time.

The basic requirements are: smooth jointing, rapid and thorough separation; Easy to adjust and repair; Small overall dimensions; Small mass; Good wear resistance and sufficient heat dissipation capacity; The operation is convenient and labor-saving, and the commonly used ones are divided into two categories: tooth inlay type and friction type.