SEAT Workshop Service and Repair Manuals

Mechatronic unit for the semi-automatic gearbox - J743 -: removing Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter. Special tools and workshop equipment required

t  Extractor -SAT 1100-, see equivalent → Anchor

t  Removal lever -T10407- t  Central diagnosis -VAS 505X- Brief description   Note t  Observe rules for cleanliness when working on gearbox → Chapter. t  Refer to general repair instructions → Chapter. t  Observe notes on dual clutch gearbox 0AM → Chapter. In order to remove the mechatronic unit, sufficient space must be available in front of the gearbox. Depending on the vehicle, parts must be removed which do not have anything to do directly with the gearbox. These are, for example, the air filter as well as the charge air lines or refrigerant lines that may be installed. Any retainers fitted to the bolts in the cover of the mechatronic unit must be removed. Tester moves all gear actuators »into neutral«. The assembly lever -T10407- must be inserted between the clutch lever and the gearbox housing in this position. This makes it possible to remove load from plungers of mechatronic unit so that they may be removed by hand from cups of engaging levers. Mechatronic unit can be removed and inserted. When installing, make sure clutch plunger is correctly seated in cup of engaging levers. Therefore, please follow description below step by step.   Note t  The clutch is self-adjusting. As the readjusting equipment can be influenced by any type of vibrations, it can also be influenced by »suddenly moving away « the 16 mm open-end wrench -T10241- from under the engaging lever, even when the mechatronic has been removed. t  In order to remove the mechatronic unit, sufficient space must be available in front of the gearbox. In some vehicles, parts must be removed which do not have anything to do directly with the gearbox. Remove any charge air lines or coolant lines that may be present. t  Any retainers fitted to the bolts in the cover of the mechatronic unit are also removed. t  A »new« mechatronic unit is correctly filled with oil. t  Do not drain oil. A »removed« mechatronic unit is sent back with its oil in. Mechatronic unit remains filled with oil. Removing: –  Raise vehicle. All 4 supports of lifting platform must be at same height. –  Put the gear selector lever into position »P«. –  Remove noise insulation → Rep. gr.50 .

In some vehicles, a cover is fitted over the engaging levers. The cover prevents dirt getting in. Tightening torque: 8 Nm –  Connecting the Vehicle diagnostic, testing and information system -VAS 505X- –  Select Guided functions. –  From the „7-speed dual clutch gearbox“, select the basic position, removal position. –  Switch ignition OFF. –  Raise the vehicle.

Caution When disconnecting the battery there is a risk of serious damage to electronic components: Observe the correct procedure for disconnecting the battery → Rep. gr.27. –  Disconnect battery . → Rep. gr.27

–  Remove battery → Electrical system; Rep. gr.27. –  Remove nuts-1- and bolt -2- and extract the battery holder. –  Remove the air filter housing completely → Rep. gr.24 .   WARNING Hot steam/hot coolant can escape - risk of scalding. t  The cooling system is under pressure when the engine is hot. t  Cover filler cap on expansion tank with a cloth and open carefully to release pressure. –  Open filler cap on expansion tank.

–  Unplug electrical connector -2- on radiator outlet coolant temperature sender -G83 -. –  Place used oil collection and extraction unit -SAT 1100- below gearbox. –  Detach coolant hose (bottom) -1- from radiator (lift retaining clip).

–  Unplug electrical connectors -1- for radiator fans at bottom of radiator cowl. –  Remove bolts -arrows- and take out radiator cowl with radiator fans from below. –  Remove starter → Electrical system; Rep. gr.27.

–  Pull on the securing mechanism to unlock and remove the plug connection on the mecatronic unit.

–  Remove oil drain plug -arrow- from gearbox.

–  Drain gear oil. –  Install oil drain plug.

–  Remove the cover of the ventilation and fit a suitable cover so that it is sealed oil tight. The cap -0AM 325 120 - can be used for this purpose.

–  Remove all retainers and brackets from front of gearbox.

–  Using a screwdriver, carefully unclip gearbox input speed sender 3 -G641- from housing in direction of arrow.

The next step is »difficult«:

Now press both engaging levers of dual clutch »away« from plungers of mechatronic unit. Otherwise, levers will jam mechatronic unit at plungers and prevent mechatronic unit from being removed.

–	Please first read this operating instruction completely. This will help you to perform the following steps correctly.

Both levers must now be carefully pressed away from the plungers.

–	First note the -red- engaging lever in the illustration.

–	Insert the assembly lever -T10407 - to the right of this.

–	Far enough until groove lines up with housing rib.

No further.

–	Assembly lever -T10407- should make contact with gearbox housing with its entire »rear face«.

Caution Housing rib and groove of lever must be flush with one another. Do not insert tool as far as stop.

–  Apply a little force to the tip of the lever when turning. This stops lever from slipping out when turning.

Turn assembly lever -T10407- anticlockwise. In this way, engaging levers are pressed away from plungers.

Do not take out assembly lever -T10407 -. It must remain inserted between clutch lever and gearbox housing for the entire process.

–	If necessary, press assembly lever -T10407- against gearbox using a screwdriver.

Note Do not take out assembly lever -T10407 -. Pulling it out may have a negative influence on the clutch adjustment.

–  Unscrew bolts of mechatronic unit for dual clutch gearbox -J743-»in diagonal sequence«. »There are 4 long and 3 short bolts.« Do not remove more than 7 bolts! –  For this purpose, take good care as to which screws you remove. Do not undo screws from the cover.

The gearbox is shown here again from the side to make this situation clearer. The mechatronic unit must be removed. The cover does not have to be removed. Therefore, do not remove more than 7 bolts! Mechatronic unit remains filled with oil.

–  Make sure no oil runs out of breather. Mechatronic unit is delivered for reconditioning with its oil in. If mechatronic unit »jams« and cannot be removed:

In some cases it may not be possible to remove the mechatronic unit. In this case, the gear actuator is »caught« at the »top left« of the gearbox housing.

–	First re-install the mechatronic of the gearbox housing and secure using a screw.

–	The mechatronic unit must be moved to the »position for removal« by hand → Chapter.

Install mechatronic unit → Chapter.