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Detach/mount start-up clutch on driven plate - AR27.51-P-0400-01W

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START UP CLUTCH

Number Designation Transmission 722.93
BA27.51-P-1001-01A Bolt, start-up clutch to driven plate Stage 1 Nm 4
Stage 2 Nm 30
Stage 3 ∠° 90
Fig 1: Identifying Wrench Socket (001 589 65 09 00)
G10241194Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Long Wedge (115 589 03 59 00)
G10241195Courtesy of MERCEDES-BENZ USA

Detaching 

NOTES Do not use an impact wrench or compressed-air tools to unscrew and screw in the bolts, otherwise the threaded unions in the driven plate will be damaged.

  1. Remove cover (8).
  2. Remove bolts (1 to 6) from start-up clutch.

    IMPORTANT Counterhold the engine at the center bolt of the crankshaft using the SPECIAL TOOL socket wrench bit and continue turning in the direction of engine rotation.

    Fig 3: Removing Bolts From Start-Up Clutch
    G10241196Courtesy of MERCEDES-BENZ USA

    Checking 

  3. INSPECT Check the driven plate (7) for damage.

    IMPORTANT Replace the driven plate (7) if the threaded unions (7a) are damaged or loose.

    Fig 4: Driven Plate And Threaded Unions
    G10241197Courtesy of MERCEDES-BENZ USA

    Attaching 

  4. Replace bolts (1 to 6) and attach start-up clutch (9) to driven plate (7).

    NOTES Observe the tightening sequence and tightening torque, otherwise the start-up clutch (9) and driven plate (7) will be damaged.

    Fig 5: Start-Up Clutch To Driven Plate Bolts Tightening Sequence
    G10241198Courtesy of MERCEDES-BENZ USA
TIGHTENING SEQUENCE

Tightening sequence Screw Stage
1 Press start-up clutch (9) against driven plate (7) using long SPECIAL TOOL wedge  
2 Attach the bolts (1 to 6) and position by hand  
3 Tighten bolts (1, 2) and, while tightening, press start-up clutch (9) against driven plate (7) using SPECIAL TOOL long wedge Stage 1
4 Tighten bolts (3 to 6) Stage 1
5 Tighten bolts (1 to 6) Stage 2
6 Tighten bolts (1 to 6) Stage 3