Measure And Adjust Installed Dimension Of Dual Clutch - AR27.20-P-0070-01MFA

Transmission 724.1 in model 118, 177, 247 

Fig 1: Identifying Support (724 589 06 31 00)

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Fig 2: Identifying Parallel Support (168 589 03 21 00)

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Use the following special tools: 2x parallel gauge, support.

When ordering the special tool parallel gauge please note that the scope of supply only includes one special tool.

A digital vernier caliper (02) is required to determine the shim size for the dual clutch (5).

Determine "dimension A" 

1. Install retaining ring (1).
2. Position parallel gauges (01) onto coupling housing (27K).
3. Calibrate digital vernier caliper (02).

   Position digital vernier caliper (02) on the parallel gauges (01) and measure down to coupling housing (27K) thereby making the zero adjustment.

   Make sure that the digital vernier caliper (02) is absolutely vertical to the contact surface on the coupling housing (27K).

4. Measure height distance between parallel gauges (01) and retaining ring (1) of clutch cover (2).

   Perform measurement at three positions and calculate the mean value. Pull retaining ring (1) upwards during the measurement. Make sure that the digital vernier caliper (02) is absolutely vertical to the measurement surface on the retaining ring (1).

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   Determine "dimension B" 

5. Measure height between parallel gauges (01) and the thrust bearing (4) of the dual clutch (5).

   Perform measurement at three positions and calculate the mean value. A shim must not be installed during the measurement. Make sure that the digital vernier caliper (02) is absolutely vertical to the measurement surface on the thrust bearing (4).

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   Determine "dimension C" 

6. Insert new coupling cover (2) into support (03).
7. Place parallel gauges (01) onto support (03).
8. Calibrate digital vernier caliper (02).

   Insert digital vernier caliper (02) into mount (03) and measure down to contact surface, thereby making the zero adjustment. Make sure that the digital vernier caliper (02) is absolutely vertical to the contact surface on the support (03).

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9. Measure height difference between mount (03) and clutch cover (2).

   Perform measurement at three positions and calculate the mean value. Make sure that the digital vernier caliper (02) is absolutely vertical to the measurement surface on the coupling cover (2).

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10. Calculate shim size for adjusting the axial play of dual clutch (5):

    Shim size: 

    Dimension B

    + Dimension C

    - Dimension A

    - Fixed dimension of retaining ring (3 mm)

    = Shim size "S" + oversize tolerance

    Example calculation: 

    Shim size: 

    14.80 mm (dimension B)

    + 20.06 mm (dimension C)

    - 30.65 mm (dimension A)

    - 3 mm (Fixed dimension of retaining ring)

    = 1.21 mm + oversize tolerance (0 to 0.2 mm)

    Add an excess tolerance of 0 to 0.2 mm to the calculated value. In the calculation example, a shim with a thickness of 1.4 mm is now installed. The shims are available in a thickness of 0.8 to 2.6 mm in increments of 0.2 mm.

11. Insertion of determined shims into axial bearing (4).
12. Remove retaining ring (1).

When removing the retaining ring (1) make sure that the seat of the retaining ring (1) and the sealing surface on the coupling housing (27K) are not damaged.