Hebei Linal Auto Parts Co.,Ltd.
Hebei Linal Auto Parts Co.,Ltd.
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Frequently asked questions about clutches

1. Where is the clutch?

Between the engine and the transmission, it is fastened to the flywheel with screws, and the clutch pressure plate presses the clutch plate.

2. Which parts of the clutch consist of?

The following figure is an example of Santana, which has a large holding in our country. A complete clutch consists of four parts: the driving part, the driven part, the pressing part, and the control structure. I will further describe the working principle of the components later. Active part: flywheel, pressure plate

Driven part: clutch plate

Compression part: compression spring

Operating mechanism: clutch pedal, push rod, return spring, clutch master cylinder, clutch sub-cylinder, release shift fork, release bearing, etc.


3. What is the role of the clutch?

He plays three major roles in ensuring a smooth start of the car, realizing smooth shifting and preventing overload of the driveline.

The first two are easy to understand. As for the overload of the drive train, it is commonly referred to as overweight. When the load of the car exceeds the load it can bear, the clutch will slip and the power cannot be output, which plays a protective role.

4. How does the clutch work?

Depress the clutch pedal, the master cylinder push rod pushes the master cylinder (clutch master cylinder) to move, and the oil pressure of the master cylinder is applied to the working cylinder (clutch slave cylinder). The push rod of the sub-cylinder pushes the shift fork to move, the shift fork pushes the release bearing, and the release bearing presses the diaphragm spring of the pressure plate. The gap between the pressure plate and the flywheel is enlarged to achieve separation and cut off the power transmission.

When we release the clutch pedal again, because there is no force applied to the clutch master cylinder, the clutch master cylinder cannot build enough oil pressure to release the bearing and can no longer depress the diaphragm spring on the pressure plate. At this time, the gap between the clutch pressure plate and the flywheel becomes smaller, the clutch plate is clamped, and then the power is transmitted to the input shaft of the transmission to realize the power transmission.


5. What are the common faults of the clutch

1. The clutch slips

2. Abnormal noise in the clutch

3. The clutch trembles

4. The clutch pedal is heavy

Clutch slip

Phenomenon: When the car is starting, the clutch pedal needs to be raised very high to barely start; during driving, when the accelerator pedal is stepped on, the speed cannot be effectively increased or increased very little; a burnt odor is smelled in the car. These are all phenomena of clutch slippage.

Reasons and solutions:

A. The free stroke of the clutch pedal is not enough

The improvement can be solved by adjusting the length of the cable or the length of the clutch push rod.

B. The clutch plate is stained with oil

Avoid oil on the clutch plate, and pay attention to it when installing it. If it is stained with oil, it needs to be cleaned and solved. If there is oil leakage, the oil leakage fault should be solved at the same time.

C. Ablation of clutch plate

The clutch plate becomes thinner after long-term use or irregular use, and it needs to be replaced at this time.

D. The aforementioned drive train overload


Clutch abnormal noise

Phenomenon: Abnormal noise occurs when the clutch is engaged, disengaged or vehicle speed changes. For example, when the clutch is just engaged, there will be a "rustle" sound, and when the clutch is engaged, disengaged, or when the vehicle speed changes, it will make a "crack, croak" sound.

Reasons and solutions:

A. The free stroke of the clutch pedal is not enough

The improvement can be solved by adjusting the length of the cable or the length of the clutch push rod.

B. The damping spring on the clutch plate is broken

Torsional vibration noise will be generated, and the driven disk should be repaired or replaced at this time.

C. The release bearing is lack of oil or damaged

A "squeaking" noise will be produced. At this time, oil the release bearing or replace the release bearing.

D. The pressure plate diaphragm spring is not in the same horizontal position

The diaphragm spring of the pressure plate is not in the same horizontal position, it is easy to break the damping spring of the clutch plate or damage the clutch plate itself. At this time, check whether the diaphragm spring is corrected or replaced in the same horizontal position.

E. Excessive wear of the clutch plate

Excessive wear of the clutch plate will cause abnormal noise due to friction between the rivets on it and the flywheel or pressure plate. Should be replaced.

F. Clutch pedal abnormal noise

If it has not been used for a long time, or the pedal position will rust, it will produce abnormal noise, so we can slip and lubricate.


Clutch shaking

Phenomenon: When the clutch is smoothly engaged according to normal operation, the car does not accelerate gradually and smoothly. Instead, it starts intermittently and even causes the car to shake until the clutch is fully engaged.

Reasons and solutions:

A. The pressure plate diaphragm spring is not in the same horizontal position

When the diaphragm springs are not in the same horizontal position, the timing of the clutch pressing will be inconsistent, and the pressure plate will be unevenly stressed or even skewed. Causes poor contact between the main and driven plates, causing the clutch to shake. At this time, it should be corrected or replaced.

B. Clutch piece warping deformation

During the clutch engagement process, the clutch discs cannot contact regularly, and the pressure cannot increase smoothly. The clutch plate should be replaced at this time.

C. The installation position is not at the same level

When the engine is loosely installed or the center line of the transmission shaft and the engine crankshaft is not in line, the clutch will shake. At this time, the engine or replacement parts should be affected.

Clutch pedal is heavy

When the clutch is equipped with a pneumatic booster or an oil-air booster, if the pedal is heavy, the power assist system of the watch will not work properly.

Reasons and solutions:

Air leakage in the piping system, abrasion of the cylinder piston sealing ring, and inadequate sealing of the exhaust valve will cause poor boosting effect or no boosting. At this time, we can find out the reason and solve the replacement.