Dual Mass Flywheel Inspection Tool Set

Professional inspection tool set designed for testing dual mass flywheels (DMF) by measuring free rotational angle and axial tilt play.

Inspection of the dual mass flywheel is essential during clutch replacement procedures, as worn or damaged flywheels may cause premature failure or destruction of newly installed clutch components and other drivetrain parts.

The inspection can be carried out directly on the installed flywheel after removal of the clutch disc, eliminating unnecessary disassembly work.

Functions

• Measurement of free rotational angle
• Inspection of flywheel tilt and play
• Diagnosis of worn or damaged dual mass flywheels
• Suitable for clutch service and drivetrain diagnostics
• Enables inspection with flywheel installed in vehicle

Included in Delivery

• 2 different locking claws for flywheel locking
• Angle measuring disc with holder
• Dial gauge with holder
• Mounting and measuring bolts
• Rotation lever

Workshop Advantages

Using this inspection tool set helps identify defective dual mass flywheels before installing a new clutch assembly.

This reduces the risk of:

• Premature clutch wear
• Clutch slipping
• Drivetrain vibrations
• Transmission damage
• Repeat repair work

Suitable for professional automotive workshops and transmission specialists.

Original reference numbers are provided for identification and comparison purposes only. This product is not an original OEM tool.

Measurement Methods for Dual Mass Flywheels (DMF)

For dual mass flywheels with an even number of clutch pressure plate mounting bolts, the lever is mounted centrally and the free rotational angle is measured using a degree disc.

This measurement method is used for most DMFs and is the preferred procedure.

For dual mass flywheels with an odd number of clutch pressure plate mounting bolts, the lever cannot be mounted centrally. In this case, the free rotational angle is determined by counting the teeth on the starter ring gear.

Determining Free Rotational Angle Using a Degree Disc

1. Install two suitable mounting bolts opposite each other into the clutch pressure plate threaded holes.
2. Mount the lever so that the square drive is positioned centrally on the DMF.
3. Lock the DMF using the locking claws.
4. Secure the degree disc using the degree disc locking device and holder.
5. Rotate the secondary flywheel counterclockwise using the lever until the spring force of the arc springs becomes noticeable.
6. Slowly release the lever until the arc springs are relaxed.
7. Set the pointer on the degree disc to “0”.
8. Rotate the secondary flywheel clockwise using the lever until the spring force of the arc springs becomes noticeable.
9. Slowly release the lever until the arc springs are relaxed.
10. Compare the measured value on the degree disc with the vehicle manufacturer’s specifications.

Determining Free Rotational Angle by Counting Teeth

1. Install two suitable mounting bolts opposite each other into the clutch pressure plate threaded holes.
2. Mount the lever so that the square drive is positioned centrally on the DMF.
3. Lock the DMF using the locking claws.
4. Rotate the secondary flywheel counterclockwise using the lever until the spring force of the arc springs becomes noticeable.

Important

For DMFs equipped with a friction control disc, a hard stop may be felt when rotating in one direction. In this case, continue rotating the secondary flywheel slightly beyond this stop in both directions using increased force until the spring force becomes noticeable. This ensures the friction control disc inside the DMF is also rotated.

5. Slowly release the lever until the arc springs are relaxed.
6. Mark the secondary and primary flywheel (starter ring gear) at the same position.
7. Rotate the secondary flywheel clockwise using the lever until the spring force of the arc springs becomes noticeable.
8. Slowly release the lever until the arc springs are relaxed.
9. Count the number of starter ring gear teeth between both markings and compare the result with the specified value.

Tilting Play Measurement

1. Mount the dial gauge to the engine block using the holder.
2. Position the dial gauge centrally on the adapter and apply the required preload.
3. Important: The measurement must be performed carefully. Excessive force can distort the measurement result and may damage the bearing.
4. Gently press the lever toward the engine until resistance is felt. Hold the lever in this position and set the dial gauge to “0”.
5. Gently press the lever in the opposite direction until resistance is felt. Compare the measured value on the dial gauge with the vehicle manufacturer’s specifications.