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

Transmission 724.0 in model 117 

Transmission 724.0 in model 118, 177, 247 

Transmission 724.0 in model 156 

Transmission 724.0 in model 176 

Transmission 724.0 in model 242 

Transmission 724.0 in model 246 

Fig 1: Identifying Support (724 589 01 31 00)

Courtesy of MERCEDES-BENZ USA

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

Courtesy of MERCEDES-BENZ USA

The following special tools are required: 2x parallel gauge, mount.

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).

   Courtesy of MERCEDES-BENZ USA

4. Measure height between parallel gauges (01) and the retaining ring (1) of the coupling cover.

   

   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).

   Courtesy of MERCEDES-BENZ USA

   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).

   Courtesy of MERCEDES-BENZ USA

   Determine "dimension C" 

6. Insert new coupling cover (2) into support (03).
7. 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).

   Courtesy of MERCEDES-BENZ USA

8. 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).

   Courtesy of MERCEDES-BENZ USA

9. 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)

   

   An oversize tolerance of 0 to 0.2 mm must then be added to the calculated value. In the example calculation here a new shim with a thickness of 1.4 mm would be installed. The shims are available in a thickness of 0.8 to 2.6 mm in increments of 0.2 mm.

10. Insertion of determined shims into thrust bearing.
11. 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.