Volkswagen Workshop Service and Repair Manuals

Removing mechatronic unit Always make sure that no dirt can enter an open gearbox. In particular, dirt entering an exposed mechatronic unit for dual clutch gearbox -J743- and/or oil pump can lead to gearbox failure.

–  Remove bolt -A- near pendulum support. To gearbox manufacture date „20 September 2004“, the gearbox was constructed with 2 plugs. The subsequent deletion of the second plug means that the oil is drained and the oil level is set using only plug -A-. The length of the plastic overflow tube (with 8 mm hexagon socket head bolt, torque setting 3 Nm) determines the oil level in the gearbox. –  Remove oil pipe. –  Drain oil. –  If oil is contaminated, change filter. Please also refer to the notes on the oil filter change regarding »dirty oil« → Chapter. –  Screw in overflow tube again hand-tight; torque setting: 3 Nm

–  Remove filter. Often, doubts arise as to whether the filter must be renewed or not. The notes on the oil filter change → Chapter can help you in reaching this decision.

–  Insert new filter with shoulder downwards and tighten cover to 20 Nm. –  Following repair work, it is not necessary to change the filter again when filling oil.

–  Loosen bolts -arrows- of cover diagonally and remove. –  Remove cover and seal. –  Always replace bolts and cover seal.

–  Remove oil pump cover -A-. –  Always renew cover.   Note

Touch an earthed object before touching mechatronic unit → Chapter.

–  Carefully release connector of gearbox input speed sender -G182- with oil temperature sender in multi-plate clutch -G509- using a small screwdriver -1-. –  Using a small screwdriver -1-, only apply pressure on locking mechanism; do not lever. Do not use screwdriver as a lever. –  With a second screwdriver -2-, loosen connector. Take the utmost care. The fastener of the connector can break. If this happens, the sender must be renewed. Do not pull on line! –  Pull off connector.

–  First pull line out of lower clip -arrow I-. –  Remove line from second clip -arrow II- and lay to side. Do not kink line.

–  Unscrew securing bolts diagonally, starting from bolt -1-. –  All 10 securing bolts must be renewed.

–  Remove mechatronic unit for dual clutch gearbox -J743-. –  When handling mechatronic unit, pay special attention to the long »sender arm«.   Caution Never lift mechatronic unit on »sender arm« or lay it on arm.

If »arm« is damaged, mechatronic unit must be renewed.

–  Lay mechatronic unit to side properly.