The clearance of a hydraulic throwout bearing (also known as a clutch release bearing or clutch bearing) is the space between the bearing and the pressure plate or pressure plate finger when the clutch is engaged. This clearance is critical to the proper functioning of the clutch system.

 Typical Range of Clearance for Hydraulic Release Bearings

Typical clearance ranges for hydraulic release bearings are approximately 0.030 to 0.100 inches (0.76 to 2.54 mm). However, exact clearance values will vary depending on the model and clutch design.

 Effects of Clearance

- Smaller clearances: typically provide a lighter and more responsive clutch pedal feel.

- Larger clearances: may result in a heavier pedal, but may improve durability.

 Hydraulic Release Bearing Setting and Adjustment

The clearance is set when the clutch system is installed and can be adjusted if necessary. It is important to follow the manufacturer's specifications to ensure correct clearance to ensure smooth clutch operation and prolong the life of the release bearing.

 Consequences of incorrect clearance

- Excessive clearance: may cause the release bearing to continually contact the fingers of the pressure plate, resulting in premature wear or even failure.

- Excessive clearance: may result in delayed or incomplete disengagement of the clutch, causing difficulty in shifting gears.

 Precautions for replacing the hydraulic release bearing

When replacing the clutch or release bearing, this clearance should be set accurately using the correct tools and procedures. This usually involves the use of shims or adjusting screws in the clutch release system.

 Manufacturer's Specifications

The exact clearance value for the hydraulic release bearing will vary due to different vehicle makes and models and their specific clutch designs and specifications. Therefore, it is not possible to provide a universal clearance value for all hydraulic release bearings.

 Maintenance and Inspection

Regularly inspect and maintain the clutch system, including the hydraulic release bearing, to ensure proper functioning and prevent potential problems or failures. This includes checking for wear, damage or excessive clearance and replacing any worn or damaged parts as necessary.

 Specific Cases

- Common range: approximately 1/16 inch to 1/8 inch (1.59 mm to 3.17 mm).

- Slightly greater range: approximately 1/8 inch to 1/4 inch (3.17 mm to 6.35 mm), with an actual target of approximately 4 mm (or approximately 3/16 inch).

 Timing of Measurement

Clearance should be measured before oil filling, because after oil filling the system is filled with hydraulic fluid and the air gap may disappear.

 Conclusion

In conclusion, hydraulic release bearing clearance is a critical parameter to ensure proper clutch system operation. To ensure accurate clearance settings, always refer to the vehicle or component manufacturer's specifications. Incorrect clearance can lead to clutch engagement problems or premature wear of the hydraulic release bearing.