A clutch release bearing, also known as a hydraulic release bearing or hydraulic throwout cylinder, is an important part of a manual transmission in an automobile. Its main function is to release the pressure between the clutch pressure plate and the flywheel when the clutch pedal is pressed down, causing the clutch disc to separate from the flywheel, thus cutting off the power transfer between the engine and the transmission and making it possible to shift gears.

With regard to the ‘spacing’ of the release bearing in a hydraulic clutch system, this concept may be somewhat vague, as the release bearing itself does not directly have a fixed ‘spacing’ parameter. However, the dimensions and clearances associated with them can be understood in the following ways:

Clearance between the bearing and the clutch pressure plate: This clearance is essential to ensure that the clutch can be disengaged and engaged smoothly. In a hydraulic clutch system, when the clutch pedal is depressed, the hydraulic system pushes the clutch release bearing forward to separate it from the clutch pressure plate, thus cutting off the power transfer from the engine to the transmission. The size of this clearance will vary depending on the model and design, but is usually precisely calculated and tuned to ensure proper clutch operation.

Bearing Clearance: Clearance is the amount of relative movement between the inner and outer rings of a bearing when it is not under load. For release bearings, a proper clearance ensures that they are able to rotate flexibly during operation while reducing friction and wear. The amount of clearance will also vary depending on the type and size of the bearing and the operating environment.

Mounting dimensions and fit tolerances: The release bearings in hydraulic clutch systems are fitted with certain mounting dimensions and fit tolerances. These requirements will detail the relative position and range of clearance between the bearing and surrounding components to ensure the proper functioning of the entire clutch system.

It is also important to note that bearing clearance and play are critical to the performance and life of the bearing. If the clearance is too large or too small, it may lead to abnormal wear, increased noise or even failure of the bearing. Therefore, when repairing and replacing bearings, it is important to operate in strict accordance with the relevant requirements.

What is the spacing for a hydraulic throwout bearing?

Hydraulic throwout bearings require a specific air gap (or clearance) when installed. The size of this clearance is critical to ensure proper clutch operation. Depending on the source and specific application, the recommended spacing ranges are roughly as follows:

- The general recommended air gap is 1/16‘ to 1/8’ (approximately 1.6 to 3.2 mm) for some types of clutch systems.

- In other cases, the recommended clearance may be 1/8‘ to 1/4’ (3.2 to 6.4 mm), especially when using, for example, a T56 Magnum gearbox, where the recommended preset clearance is approximately 4 mm (about 1/6‘ or 3/16’).

- Maximum Spacing:If the spacing is too great, the clutch may not disengage completely, resulting in difficult shifting or clutch slippage.

To determine the exact spacing of the hydraulic throwout bearing, you should.

1. check your vehicle's service manual:The service manual will have the exact specifications for the clutch system, including throwout bearing spacing.

2. measure the current bearing:If you are replacing a worn throwout bearing, you can measure the old one, but keep in mind that wear may have changed the original spacing.

3. contact the dealer or parts supplier:A dealer or reputable parts supplier can provide the correct specification throwout bearing for your vehicle.

When installing, be sure to follow the guidelines of the vehicle manufacturer or the supplier of the particular clutch component, as different systems may require different clearances to ensure optimum performance and extended service life. Setting this clearance correctly will prevent premature clutch wear and ensure smooth clutch operation. If installed incorrectly, this may result in uneven clutch engagement, slippage, or other problems. If you're unsure about this process, it's best to have it done by a professional mechanic.