SEAT Workshop Service and Repair Manuals

Installing –  Place the differential on the clutch housing.

–  Sealing washers -arrows- must always be renewed.   Note The figure only shows 3 or 4 bolts with their O-ring gaskets. –  Place the input shaft, layshaft and reverse gear shaft together. –  Partially diagonally screw in the 4 nuts on the secondary shaft bearing cover and then tighten to a torque of 25 Nm + 90°.   Note Clean remains of safety agent from the support thread for the reverse gear shaft. Use a tap. –  Install the reverse gear shaft support –  Fit the reverse gear fork.

Installation position of reverse gear prong and shaft. –  Fit the prongs with the connection guides.

–  Screw stud bolt -A- M8×100 mm into support for reverse gear shaft so that it is aligned after attaching transmission housing. –  Align the connection guides. –  Check that the change-over bolts of the gearbox prongs are housed in their respective mobile sleeves. –  Check that the magnet is not broken or cracked and place it in its housing in the clutch housing. –  Thoroughly clean contact surfaces of clutch casing and gearbox casing. Apply a uniform layer (not too thick) of sealant paste → Spare parts catalogue. –  Assemble the gearbox casing on the clutch housing. –  Tighten screws securing the clutch housing to the gearbox casing to a torque of 25 Nm + 90°.

–  Fit bolts for reverse gear shaft support -arrows- as shown: –  Position bolt -a-, unscrew the M8 x 100 mm stud and tighten bolt -b- by hand Tightening sequence: 1  -  Bolt -a- 30 Nm (M8 x 32) 2  -  Bolt -b- 25 Nm (M8 x 26)

–  Install the bearing bolts -arrow- for the gearbox prongs. Use a screwdriver to align the connection guides, so that each support bolt can be installed in its housing. –  Thoroughly clean contact surfaces of sealing cap for gear selector and casing. Apply a uniform layer (not too thick) of sealant paste → Spare parts catalogue. –  Install the cover on the gear selector. Install the gear selector shaft as follows: –  Place the connection guides in neutral position.

–  Locate lug -arrow 1- in recess in gearbox housing. Install the gear selector shaft so that connection finger -arrow 2- goes into to the engagement guides. –  Screw in the fixing bolts of the gear selector lever in the gearbox housing and tighten these to 25 Nm.

For vehicles with start stop system –  Install the gearbox neutral position sender -G701--arrow- and tighten the screw to 5 Nm. Continued for all vehicles Installation position of 5th gear pinion:

–  The lobe present -arrow- on the internal diameter of the gear must be orientated towards the gearbox casing. –  Heat 5th gear pinion to approx. 100 ºC with the hot air blower -SAT 1416-.

–  Press in sprocket with adapter -U 40200/20-.

Check 5th gear synchrony ring for wear. –  Before checking for wear, thoroughly clean the synchroniser ring and 5th gear mesh. –  Fit 5th gear synchrony ring on the mobile pinion. Press the synchrony ring on the sprocket and measure the elevation „a“ with a thickness jig.

Synchrony-ring	Measurement „a“ on new synchromesh	Wear limit
5. gear	1,1 ... 1.7 mm	0.5 mm

–  Fit the mobile 5th gear pinion with the needle bearing. –  Fit 5th gear synchrony ring on the mobile pinion.

Install springs in synchromesh assembly of 5th gear –  Install spring rings 120° offset below extensions -C-. Springs must seat with angled ends in front of locking pieces -arrows-. –  Check that the teeth terminating in end -A- of the sliding sleeve are located in the same direction with the most pronounced lug -B- of the axle box. –  Check that locking pins are correctly installed → Anchor.

Installation position of the synchromesh unit / mobile sleeve of 5th gear –  Install 5th gear wheel on input shaft so that the teeth on the conical selector sleeve -arrow 1- and the high collar on the synchromesh element -arrow 2- point toward the transmission housing. –  Align recesses -arrow 3- on synchromesh hub to locking elements on synchromesh ring (-arrows- lower figure).

5th gear synchromesh ring with connected locking elements -arrows- –  Cover all holes with rag to prevent foreign body from penetrating into the transmission.

–  Fit synchromesh assembly on 5th gear mobile pinion. Use the adaptorr - U 40200/20-.   Note When fitting synchromesh assembly to 5th gear, check the 5th gear synchromesh ring turns freely. –  Clean bolt holes for mounting synchromesh element and 5th gear with tap to remove residues of bolt securing agent. Otherwise the bolts may shear. –  Partially screw mounting bolts → Item onto synchromesh element and 5th gear wheel. Installation position of the plate spring

–  The concave side of the plate springs -arrows- should point toward the synchronous hub and 5th gear wheel.

Before tightening mounting bolts on synchromesh hub and 5th gear wheel, press 5th gear selector sleeve downward -arrow 1- and engage gear. Also shift into 1st gear with shift lever -arrow 2- and -arrow 3-. The input and output shafts remain locked when two gears are engaged; the synchromesh hub and 5th gear wheel do not turn. Tighten the bolts -A- to a torque of 80 Nm. –  Install 5th gear connection prong with a torque of 25Nm.

Adjust the sliding sleeve and the prong for the 5th gear –  5. Gear engaged. Loosen bolt -1-. Press the mobile sleeve and the gear mouth in the direction of the -arrow-; then tighten the bolt -1- to 25 Nm. l  Control measurement: Between the mobile sleeve and the mobile pinion, a thickness gauge of 0.2 mm cannot be inserted. If necessary, repeat the adjustment process. –  Shift out of 5th gear. The sleeve must be situated in neutral position and the synchrony ring must turn freely in this position. –  Shift through all gears.

–  Install the gasket and gearbox casing cover -arrow-. –  Tighten the bolts to secure the gearbox casing cover to a torque of 10 Nm. –  Fit guide socket for clutch release bearing and secure to casing using the three cylindrical bolts → Chapter –  Install thrust washer, spring, conical ring and left articulation flange → Chapter.