Install automatic transmission (GA8HP51Z)

Checking installation position of torque converter

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• Check the installation dimension between the contact surfaces (1) and the outer edge (2) of the threaded hole of the torque converter with the special tool 0 490 189 (00 2 550) .

See repair instructions

• REMOVING AND INSTALLING/REPLACING TORQUE CONVERTER 

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• Align the automatic transmission horizontal to the engine before installation.
• Check the fitting sleeves (1) for correct seating and damage and replace if necessary.

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• Flange-mount transmission.
• Turn torque converter until bore hole of torque converter is aligned with bore hole of flywheel.
• Join the bolts (arrows) and hand-tighten.

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• Turn the knurled screw (2) until the plate (3) is no longer in contact.
• Release screws (1) and remove the special tool 5 A0C 1B9 .

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• Replace screws (1).

  Parts:  Screws

• Tighten the screws (1) on the front axle support.

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• Replace sealing rings.

  Parts:  Sealing ring

• Install hydraulic lines (2) on transmission.
• Position and tighten the screw (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Transmission oil line to transmission
  M6x25 Replace the sealing ring.	tightening torque	8 Nm

• Position and tighten the screw (3).

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  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Transmission oil line on holder
  M6	Tightening torque	4 Nm

• Release screw (1) and screw (2).
• Remove the special tool 0 494 451 (24 4 160) .

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• Install the sealing cap (1).

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• Replace screws.

  Parts:  Screws

• Crank the engine on the vibration damper in the direction of rotation using special tool 0 493 380 (11 6 480) to tighten all six screws (1).
• Tighten all 6 screws (1) of the torque converter using special tool 0 491 667 (24 1 110) .
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Torque converter to flywheel
  M10 Replace screws.	tightening torque	56 Nm

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• Install acoustic cover (2).
• Install the expanding rivet (1).

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• Install the exhaust bracket (2).
• Position the screws (1) and hand-tighten.

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• Tighten nuts (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter to holder
  M8 Nut Replace nut.	tightening torque	28 Nm

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• Remove the special tool 0 494 213 (24 2 390) from the sealing sleeve in direction of arrow.

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  NOTE: Notes on mechatronics are a fundamental requirement for these repair instructions and must be complied with at all times.
  For additional information see: 24 34... Notes on mechatronics (GA8HP50Z/GA8HP51Z/GA8HP75Z/GA8H). Refer to 24 34 SHIFT VALVES, PARKING LOCK .

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• Slide the connector (1) on and turn it to lock.
• Tighten the transmission bolts in sequence (1) to (9).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Transmission to engine
  M8	Tightening torque	19 Nm
  M12	Tightening torque	66 Nm

  Fig 1: Transmission Bolts Tightening Sequence

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• Install the ground strap (2).
• Tighten down screw (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Ground strap to transmission or body
  M8	tightening torque	19 Nm

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• Install transmission cross-member.
• Tighten down screw (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Transmission cross member to rubber mounts
  M12	tightening torque	100 Nm

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• Tighten down screws (2).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Transmission cross member to body
  M8	tightening torque	19 Nm

• Remove the transmission jack.

Follow-up work 

• Refer to FASTENING THE PROP SHAFT (PARTIALLY REMOVED) .
• Refer to INSTALLING TRANSMISSION CROSS MEMBER .
• Refer to INSTALLING THE RETAINING PLATES .
• Refer to INSTALLING THE CONNECTING SUPPORTS ON THE TUNNEL .
• Refer to INSTALLING THE HEAT SHIELDS .
• Refer to INSTALLING EXHAUST SYSTEM .
• Refer to INSTALLING THE LEFT AND RIGHT REAR DIFFUSER .
• Refer to INSTALLING THE TENSION STRUT AT THE RIGHT REAR AND IF NECESSARY, ON THE LEFT SIDE .
• Refer to INSTALLING STARTER MOTOR .
• Refer to SECURING THE OIL SUMP ACOUSTIC COVER .
• Refer to INSTALLING THE STIFFENING PLATE .
• Refer to CONNECTING ALL BATTERY GROUND LEADS .
• Refer to CHECKING/TOPPING UP THE OIL LEVEL IN THE AUTOMATIC TRANSMISSION .
• Refer to INSTALLING UNDERBODY PROTECTION AT REAR .
• Refer to INSTALLING FRONT UNDERBODY PROTECTION .
• Refer to ENCODING/PROGRAMING CONTROL UNIT(S) .