The Throwout Bearing, also known as the Clutch Release Bearing, is a key component of the clutch system in manual transmission vehicles. Its main function is to separate the pressure plate from the flywheel by contacting and pushing the release lever on the clutch pressure plate during the clutch release process, thus interrupting the power transmission between the engine and the transmission. The throwout bearing is usually mounted on the clutch fork, and when the driver depresses the clutch pedal, the clutch fork pushes the throwout bearing, which in turn pushes the release lever on the pressure plate.

Signs of a bad throwout bearing

When a clutch release bearing is faulty or bad, it usually exhibits some of the following signs:

1. A strange noise:

Sharp noise: A sharp “squeaking” or “hissing” sound may be heard when the clutch pedal is depressed or released. This sound is usually caused by worn, under-lubricated or damaged bearings.

Irregular noises: Irregular noises, such as “thuds” or “buzzes”, sometimes occur and may vary with clutch operation.

2. Difficulty in operation:

2.1 HEAVY CLUTCH PEDAL: When there is a problem with the clutch release bearing, operation of the clutch pedal may become heavy or laborious.

2.2 Poor clutch pedal return: after releasing the clutch pedal, the pedal may not return quickly or completely to its original position.

2.3 Difficulty in shifting gears: A faulty throwout bearing may also cause difficulty in shifting gears. When the clutch fails to fully disengage, the gears may not engage smoothly, resulting in frustration or stalling when shifting gears.

2.4 Incomplete clutch disengagement: In severe cases, damage to the throwout bearing may result in the clutch failing to fully disengage, and the connection between the engine and transmission may not be fully disconnected even when the driver fully depresses the clutch pedal. This will result in a noticeable stutter or shock when the vehicle is shifting gears.

3. Clutch slippage:

During acceleration, if the clutch release bearing is badly damaged, it may cause the clutch to slip. This is manifested by an increase in engine speed, but the vehicle speed increase is not obvious, and may be accompanied by a burning smell.

4. Vehicle traveling abnormality:

Vibration while driving: When driving at low speed or turning, you may feel a significant vibration in the steering wheel or vehicle.

Runaway phenomenon: In serious cases, bearing failure may also lead to runaway phenomenon while the vehicle is traveling, increasing the risk of traffic accidents.

5. Reduced vehicle performance: 

A throwout bearing failure may affect the overall performance of the vehicle, including acceleration and fuel efficiency. This is because incomplete disengagement of the clutch will result in partial loss of power output from the engine, increasing fuel consumption.

Countermeasures

As soon as you notice signs of a poor clutch release bearing, you should have it inspected and repaired. This usually involves checking the wear of the bearing, the state of lubrication, and whether there is any foreign matter intruding into it. If the bearing is seriously damaged, it is necessary to replace the clutch release bearing with a new one in time to ensure proper clutch operation and driving safety.

Please note that the above information is for reference only. In practice, inspections and repairs should be carried out according to the specific conditions of the vehicle and the instructions in the service manual. If you are not sure how to handle the situation or are concerned about your lack of skills, it is advisable to seek professional automotive repair services.

Effects of Throwout Bearing Damage on the Transmission:

Throwout Bearing (Throwout Bearing) damage affects the transmission in the following ways:

1. Incomplete Clutch Separation: The main function of the Throwout Bearing is to push the release lever on the clutch pressure plate to separate the pressure plate from the flywheel when the driver depresses the clutch pedal. If the throwout bearing is damaged, it may not be able to effectively push the release lever, resulting in incomplete clutch separation. This means that the connection between the engine and the transmission is not completely disconnected when shifting gears, which can make shifting more difficult and may lead to gear collisions or even damage to the gears and synchronizers inside the transmission.

2. Difficulty in shifting gears: Drivers may experience difficulty in shifting gears due to incomplete clutch disengagement. The gears may not mesh smoothly, leading to frustration or jams when shifting, and in severe cases, the shift may not even be completed, affecting the normal operation of the vehicle.

3. Increased Transmission Wear: When the clutch fails to disengage completely, the transmission is subjected to additional loads during gear shifts. This abnormal operating condition accelerates the wear and tear of the internal parts of the gearbox, especially the gears and synchronizers, which may lead to premature damage to the gearbox.

4. Reduced vehicle performance: Failure of the throwout bearing can affect the overall performance of the vehicle. Incomplete disengagement of the clutch will result in partial loss of power output from the engine, affecting acceleration, while increasing fuel consumption and reducing the fuel efficiency of the vehicle.

5. Noise and vibration: Damaged throwout bearings produce abnormal noise and vibration during operation, which not only come from the throwout bearing itself, but may also be transmitted to the transmission through the clutch system, resulting in abnormal noise and vibration throughout the entire drivetrain.

6. Safety hazard: Clutch and gearbox are key components of the vehicle's transmission system, and their proper functioning is essential to ensure safe driving. Damage to the throwout bearing may lead to clutch and transmission failure, increasing driving risks, especially at high speeds or in emergencies, may not be able to shift gears in a timely manner, affecting the vehicle's maneuverability and safety.

In short, damage to the throwout bearing will not only affect the normal operation of the clutch, but will also cause a series of negative impacts on the transmission, including increased wear and tear, reduced performance, noise and vibration, as well as increased safety risks. Therefore, once you notice signs of damage to the throwout bearing, it should be promptly inspected and replaced to avoid further vehicle damage and potential safety issues.