SEAT Workshop Service and Repair Manuals

Installing mechatronic unit for dual clutch gearbox -J743- Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter. Special tools and workshop equipment required

t  Guide pin -T10406-

The assembly lever -T10407 - remains between the lever and the gearbox casing.   Note 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.

Installing

–	Take care that all selector forks of the gearbox are put into »idling«.

Make sure that all selector forks are located in -N-, »in the middle«, and therefore that the gearbox is in neutral.

–	Each of the 4 selector forks must be checked by hand for this purpose.

Each selector fork has 3 possible positions: »Gear engaged - Neutral position - Gear engaged«.

–	Each switching fork must be put into every position one after another. Then all gears must be pulled out and the switching forks must be moved to the »centre position«.

»Neutral, neutral, neutral«, or gearbox will not function!

You can turn the gear slightly for assistance. This makes it »easier« to shift the forks.

–	Clean the sealing surface to which the mechatronic will be fitted later.

Oil residues on sealing surface will later result in a misdiagnosis of »leaking«.

–  Screw in the guide pins -T10406- by hand.

Make sure that all gear actuators project by 25 millimetres -a-.

Caution Work with care. When levering the plungers out of the mechatronic unit, make sure that you do not brace yourself on the sensors.

–  Clean the sealing surface of the mechatronic.

–  Secure the seal of mechatronic. It should be built round. –  Inspect the sender. Clip must not be damaged. –  Put on mechatronic unit. –  When removing and placing, give particular attention to the shift forks are not to be drawn out of their position. –  Also take note of the shift lever and the plunger on the mechatronic unit.

–  Screw in 7 new bolts and tighten until finger-tight. –  Remove guide pins -T10406 - again.

–  Ensure that the lifter runs duly into the intended hollows of the engaging levers. –  Take out the lifter with the hand so far, until it sits in the mould. For placing the lifter into its position a double welded wire hooks can be used. –  Control the position of the plunger again.

Plungers that are not seated correctly will damage mechatronic unit. –  Tighten mechatronic unit diagonally to 10 Nm.

–  Turn assembly lever -T10407- clockwise and remove it.

–  Install gearbox input speed sender 3 -G641 -. –  Inspect the sender. Clip must not be damaged. l  The sender must be supported completely and fitted securely on the gearbox housing. If sender is »loose« because the clip is broken, renew mechatronic unit.

–  Remove plug and put on breather cap. –  Put on connector of mechatronic unit.

–  Install all front brackets of the gearbox.

In some vehicles, a cover is fitted over the engaging levers. The cover prevents dirt getting in. Tightening torque: 8 Nm –  Install starter → Electrical system; Rep. gr.27 Fill the gearbox with gearbox oil → Chapter.

–  Connect the electrical connector -2- on radiator outlet coolant temperature sender -G83 -. –  Mount the coolant hose -1- to the bottom of the radiator, pulling out retaining clip for this purpose. –  Install battery and battery holder → Electrical system; Rep. gr.27 . –  Install complete air cleaner housing → Rep. gr.24 . –  Connect battery → Electrical system; Rep. gr.27. –  If necessary: Replenish coolant → Engine; Rep. gr.19 –  Check adjustment of selector lever cable and adjust if necessary → Chapter. –  Install noise insulation → Rep. gr.50 . –  Connecting the Vehicle diagnostic, testing and information system -VAS 505X- –  Carry out the complete basic settings in the Guided Functions → Vehicle diagnostic tester. Mechatronic unit remains filled with oil. –  Place plug on »removed« mechatronic unit if necessary. This means mechatronic unit can be sent sealed in oil-tight condition.