Installing automatic transmission (all-wheel drive vehicle) (GA8HP51Z)

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NOTE: RISK OF DAMAGE
Damage to the transmission .
Damage to the transmission due to unapproved transmission oil .

Use only the approved transmission oil.
Check the transmission oil level after completing the repair.

Checking installation position of torque converter

NOTE: RISK OF DAMAGE
Damage to the automatic transmission/impeller .
When disconnecting the engine and transmission, the torque converter can become loose! Failure to observe the correct installation positions of the torque converter may lead to damage to the impeller driver .

Make sure that the torque converter is in the correct installation position before installing the automatic transmission.

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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
NOTE:
RISK OF DAMAGE
Damage of the flywheel and automatic transmission .
A non-horizontal fit during the removal an installation of the automatic transmission can lead to damage on the automatic transmission or flywheel .
- Align the automatic transmission completely horizontal to the engine during the removal and installation.
- Check for correct alignment before tightening the transmission bolts.
Align the automatic transmission horizontal to the engine before installation.

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Check the fitting sleeves (1) for correct seating and damage and replace if necessary.

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Flange-mount transmission.
Turn the torque converter until the bore of the torque converter is aligned with the bore of the 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 A0C1B9.

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Replace screws (1).
Parts : Screws

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

TIGHTENING TORQUE SPECIFICATIONS

Front axle carrier to body, rear
M14 Replace screw.	Joining torque	100 Nm
M14 Replace screw.	Angle of rotation	90°

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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

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Position and tighten the screw (3).

TIGHTENING TORQUE SPECIFICATIONS

Transmission oil line on holder
M6	Tightening torque	4 Nm

Install the transfer box with the front propeller shaft.
NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.

Fig 1: Transfer Box Screws Tightening Sequence
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Tighten the screws in order from (1) to (5).

TIGHTENING TORQUE SPECIFICATIONS

Transfer box to automatic transmission
M10	Tightening torque	43 Nm

Before installing the prop shaft on the front axle transmission, all 4 threads (1) in the front axle transmission flange must be freed of possible residue and contaminations and cleaned.

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Replace screws.
Parts : Screws
A drop of Loctite 270 (2) must be given before the screw connection on each thread at the end of the respective screw (1).
CONSUMABLE SPECIFICATIONS

High-strength screw lock, Loctite 270 10 ml, Tube 83192210 337

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NOTE: TECHNICAL INFORMATION
After the screw connection of the front prop shaft, a 30 minute hardening time must be ensured before the vehicle is operated again.

Tighten screws (arrows).

TIGHTENING TORQUE SPECIFICATIONS

Prop shaft before the front axle differential
Replace screws. Joining torque and angle of rotation must be observed without fail.	Joining torque	20 Nm
	Angle of rotation	45°

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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
Turn the engine in the direction of rotation using special tool 0 493 380 (11 6 480) on the vibration damper to tighten all 6 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).

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

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NOTE: TECHNICAL INFORMATION
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 .
Slide connector (1) in the arrow direction and lock it by turning it.

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Tighten the transmission bolts in the sequence (1) to (9).

TIGHTENING TORQUE SPECIFICATIONS

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

Fig 2: Transmission Bolts Tightening Sequence

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Connect the connector (1) on the VTG control unit (longitudinal torque distribution) (2).

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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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Version A:
Replace screws (1).
Parts : Screws
Position transmission bearing support (2).

Tighten down screws (1).

TIGHTENING TORQUE SPECIFICATIONS

Transmission bearing support to body
M8	tightening torque	19 Nm

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Version B:
Replace screws (1).
Parts : Screws
Position transmission bearing support (2).

Tighten down screws (1).

TIGHTENING TORQUE SPECIFICATIONS

Transmission bearing support to body
M8	tightening torque	19 Nm

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Install the transmission cross member (3).

Tighten down screw (2).

TIGHTENING TORQUE SPECIFICATIONS

Transmission cross member to rubber mounts
M12	tightening torque	68 Nm

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Tighten down screws (1).

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 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 INSTALLING THE ACOUSTIC COVER FOR THE OIL SUMP .
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) .