What is the Clutch Release Bearing Noise

Common Types and Causes of Clutch Noise

• Continuous brushing or hissing sounds : Usually due to a lack of oil in the release bearing or a damaged bearing. When the clutch pedal is depressed, the release bearing starts to work, producing this noise. Even after releasing the pedal, the sound may persist for a short while.
• Intermittent metallic clanking noises : If you hear rhythmic metallic noises like “clacking” or “clicking”, there are several possible reasons. For example, loose fixing bolts on the clutch pressure plate can cause it to wobble and produce impacts as the engine turns. Wear and looseness in the keyway between the clutch-driven disc’s spline hub and the transmission input shaft can also lead to knocking sounds during power transmission. Additionally, wear and loosening of the release lever pins or their bushing in the clutch can result in similar noises.
• Sharp screeching sounds : These may be caused by friction between the release bearing and the clutch diaphragm spring. When the release bearing is worn or poorly lubricated, this friction occurs when the clutch pedal is pressed. Also, severe local wear on the clutch friction plate can produce similar noises during vehicle startup or gear shifting.
• Torsional vibration noise : This occurs when the torsion damping spring on the clutch-driven disc becomes aged or broken, or when the driven disc itself experiences torsional vibration. It’s typically noticeable during vehicle startup or sudden acceleration.

Other Factors That May Cause Clutch Noise

• Clutch pedal return spring issues : If the return spring is too soft, fatigued, or falls off, the pedal may not return smoothly. This can cause the release bearing to remain in contact with the release lever, generating friction noise. Also, the pedal might collide with the driver’s floorboard when fully depressed.
• Clutch disc installation or material problems : Incorrect installation or improper material selection for the clutch disc can result in poor contact between it, the pressure plate, and the flywheel, leading to noise during engagement or disengagement.
• Loose connections in the operating mechanism : Loose connections in the clutch operating mechanism, such as the pedal pull rod or release fork, can produce intermittent impact noises during driving, disrupting normal clutch operation.

Solutions and Maintenance Suggestions

• Inspection and lubrication : Regularly check the clutch components, especially the release bearing and other wear – prone parts. Timely lubrication with oil or grease can reduce friction noise.
• Adjustment and tightening : Check and adjust the clutch pedal’s free travel to meet vehicle requirements. This prevents excessive or insufficient free travel, which can cause incomplete clutch disengagement or accelerated component wear. Also, tighten any loose parts in the operating mechanism to avoid impact noises.
• Timely replacement of damaged parts : If key components like the clutch pressure plate, driven disc, or release bearing are severely worn or damaged, replace them promptly to ensure safe driving and proper vehicle operation. Kindly obtain the product information you need through Jingqi’s query website: https://www.jqbearing.cn/?s=JHC.
• Develop good driving habits : Avoid keeping the clutch pedal half – depressed for extended periods, as this can accelerate wear on the friction plate, pressure plate, and release lever, shortening the clutch’s lifespan. Also, when stopping, brake before pressing the clutch to reduce the clutch’s load.

In summary, clutch noise can stem from various complex factors. Drivers should closely monitor the clutch’s performance. If any abnormal noises or fault signs are detected, conduct timely inspections and repairs to ensure driving safety and proper vehicle operation..