Throwout bearing (clutch release bearing) detailed explanation

 I. Definition of throwout bearing

The throwout bearing, also known as the clutch release bearing, is a key component in the automotive clutch system. It is located between the clutch pressure plate and the release fork. When the driver depresses the clutch pedal, the bearing pushes the release fork, which in turn separates the pressure plate from the flywheel, allowing for a shift operation. Specifically, the main function of the throwout bearing is to push the clutch pressure plate hydraulically or mechanically when the clutch pedal is pressed to separate the clutch plate from the flywheel, thus cutting off the power transmission between the engine and the transmission and ensuring a smooth gearshift process.

 When to replace throwout bearings

A throwout bearing is usually durable, but it can wear out or become damaged over time and with more frequent use. Here are some common situations when throw bearings need to be replaced:

1. Abnormal noise:

   - If you hear a “buzzing” sound, a sharp metallic scraping sound or a continuous noise when the clutch pedal is depressed, it may be a sign of a worn or damaged throwout bearing. This sound is usually more noticeable when the vehicle is starting.   

2. Difficulty shifting gears:

   - A damaged throwout bearing can cause the clutch to disengage incompletely, which can make shifting gears difficult or jarring. The driver may feel that the gears are not shifting smoothly, or even sometimes cannot be put into gear smoothly.

3. Abnormal clutch pedal feel:

   - If the clutch pedal becomes loose, too hard, or reacts abnormally (e.g., no feeling when pressed), this may be an indication of a throwout bearing problem. Poor pedal rebound or increased “air travel” are also common signs of trouble. 

4. Strange or burning odor:

   - If the throwout bearing does not operate smoothly at high temperatures, an odor may develop and the clutch may even overheat. Other parts of the clutch system may also be affected in this case.

5. Constant vibration:

   - If the ball bearings in the throwout bearing are damaged or worn, this can cause unusual vibrations or an uneven feel, especially when the vehicle is starting or traveling at low speeds.

6. Clutch failure:

   - If the clutch fails to fully disengage or engage, resulting in difficult shifting or loss of engine power, this may be related to damage to the throwout bearing.

7. preventive maintenance:

   - For vehicles with long mileage (e.g. over 100,000 kilometers), or where the clutch system has been serviced several times, throwout bearing replacement may also be part of preventive maintenance to avoid potential problems.

III. cost of throwout bearing replacement

The total cost of replacing a throwout bearing usually consists of the following components:

1. the cost of spare parts:

   - Price of throwout bearings: Depending on the model, brand and market, throwout bearings usually cost between $50 and $150 (about RMB 350 to RMB 1050). High-end models or special parts may cost more.

   - Other related parts: If the clutch plate, pressure plate, flywheel, etc. are also found to be defective when the throwout bearing is replaced, it may be necessary to replace these parts at the same time. The cost of clutch plate and pressure plate usually ranges from $200 to $500 (RMB 1,400 to 3,500), depending on the model and quality of the parts.

2. Labor costs:

   - Replacing a throwout bearing is a relatively complex job that usually requires disassembly of the transmission or clutch assembly, so labor hours are a major part of the cost. Hourly rates vary by region and repair store, and usually range from $100 to $150 (RMB 700 to 1000) per hour. The whole replacement process usually takes 4 to 6 hours, so the labor cost may range from $400 to $900 (RMB 2,800 to 6,300).

3. Additional costs:

   - During the replacement process, other related parts such as oil seals and drive shafts may need to be replaced. In addition, if other problems are found during the repair process, such as worn out bearing housings, damaged oil seals, etc., additional repair costs may also be required.

 IV. Total Cost Estimation

- Replacement of throwout bearing only: If only the throwout bearing is replaced, the overall cost will be roughly $500 to $1,200 (approximately RMB 3,500 to RMB 8,400). This includes the purchase cost of the throwout bearing and labor.  

- Replacing the clutch disc and pressure plate at the same time: If the clutch disc and pressure plate need to be replaced at the same time, the total cost may increase to $1,000 to $2,500 (RMB 7,000 to 17,500). This includes not only the cost of the throwout bearing, but also the cost of the clutch plate, pressure plate, and other related parts.

Recommendations

1. Regular inspection: It is recommended that vehicle owners check the condition of the clutch system regularly, especially after the vehicle has been driven for a long mileage or the clutch system has been repaired for many times, replacing the throwout bearing in time can prolong the service life of the clutch system.   

2. Choose a professional repair store: replacing the throwout bearing is a complicated repair work, it is recommended to choose a professional repair store with experience to ensure a smooth and safe replacement process.

3. Consult quotations: Before deciding to replace the throwout bearing, vehicle owners are advised to consult several repair stores to get accurate quotations and repair suggestions so as to make the most suitable choice.

Through regular maintenance and timely replacement of throwout bearings, vehicle owners can ensure that the clutch system of their vehicles is always in the best working condition, which will enhance the driving experience and prolong the service life of their vehicles.

V. Summary

The throwout bearing is a very important part of the automotive clutch system, responsible for helping to separate the clutch pressure plate from the flywheel when the driver depresses the clutch pedal, thus realizing smooth gear shifting. If the throwout bearing fails, such as abnormal noise, difficulty in shifting gears, odor and other problems, it should be replaced as soon as possible so as not to affect the clutch system and driving experience of the vehicle.

The cost of replacing a throwout bearing usually consists of the cost of parts and labor, depending on the vehicle model, the quality of the parts, the location of the repair, and whether other related parts need to be replaced. Timely inspection and maintenance of the clutch system, especially regular checking of the condition of the throwout bearing, can prevent more serious clutch damage and higher repair costs.