What Causes Abnormal Noise When Pressing the Clutch in a Manual Transmission?

[Peeta]

There are several main reasons for abnormal noise when pressing the clutch in a manual transmission: 1. Noise when releasing the clutch: If the clutch can return to its position on its own, check whether the gap between the release bearing and the release lever meets the specified standard, usually a distance of 3-100px. If it doesn't meet the standard, adjustment is needed. If the clutch cannot return on its own, the return spring of the release bearing is likely damaged and should be replaced promptly. 2. Noise when pressing the clutch: If abnormal noise occurs when pressing the clutch, whether lightly, continuously, or intermittently, the bearing should be replaced, as it may be due to broken bearing balls, lack of lubrication, or burning. However, if the noise occurs only when the clutch is almost or fully pressed down, it is likely caused by wear and looseness between the intermediate pressure plate pin hole and the drive pin. This can be addressed by using a thicker conical release spring to stabilize the intermediate pressure plate and prevent it from wobbling and hitting the drive pin. 3. Noise during startup: If abnormal noise occurs when the car starts, it indicates loose rivets between the driven plate and the splined hub or a cracked steel plate. If a single impact sound is heard when the clutch engages, it is usually due to looseness between the driven plate splined hub and the transmission's first shaft. If the driven plate has a damper, the damper spring may be broken. In this case, tighten the loose rivets or replace the cracked steel plate. 4. Noise during the moment of separation or engagement: If noise occurs at this time, it is mostly due to wear and looseness in the release lever or bracket pin hole, looseness between the pressure plate's protruding part and the window hole, or loose and exposed friction plate rivets. This is relatively simple to repair.