SEAT Workshop Service and Repair Manuals

Differential: Adjust Adjust the differential when one of the following elements has been replaced: l  Gearbox l  clutch housing l  Differential housing or l  Tapered roller bearings for differential

Refer to the adjustment chart –  Remove the outer roller bearing track from the differential, in the gearbox and clutch housing, with adapter -U-40200/10- and adapter -U-40300/11-.   Note t  The procedure and tools needed to remove the secondary shaft rear bearings outer tracks, are identical in the gearbox casing and the clutch housing. t  To remove the outer track of the clutch housing, first remove the socket for right hand flanged shaft t  The roller bearings and their corresponding outer tracks are matched pairs. Do not mix with other bearings.

–  Install the outer roller bearing track from the differential, in the gearbox and clutch housing, without shims, with adapter -U-40200/10- and adapter -U-40300/12-.   Note The procedure and tools needed to install the secondary shaft rear bearings outer tracks, are identical in the gearbox casing and the clutch housing. –  Fit differential into clutch housing. –  Position the gearbox casing on the clutch housing and tighten the securing bolts to a tightening torque of 25 Nm + 90º.

–  Install support -T20020- with a dial gauge on the gearbox housing. Place its end on the differential, inserting the adapter -U-40300/13-. –  Adjust the dial gauge „0“ with a pre-tension of 1 mm. –  Move the differential alternately in the direction of the arrows. –  Note the reading on the comparator (e.g. 0.700000 mm).   Note When measuring do not turn the differential, because the roller bearings may settle and the reading would be erroneous. Shim calculation table The specified pre-tension of the bearing is obtained by adding a constant pressure value (0.40 mm) to the obtained measurement value (in the example: 0.70mm). Example:

Average value	0.70 mm
+ Pressure value (const. value)	0.40 mm
Thickness of shim	1.10 mm

–  Determine shim thickness using the table; part number → Current parts catalogue. The following shims are available:

Bearing play	Shim
Measured value (mm)	Thickness (mm)
0,303 … 0,449	0,650
0,450 … 0,499	0,700
0,500 … 0,549	0,750
0,550 … 0,599	0,800
0,600 … 0,649	0,850
0,650 … 0,699	0,900
0,700 … 0,749	0,950
0,750 … 0,799	1,000
0,800 … 0,849	1,050
0,850 … 0,899	1,100
0,900 … 0,949	1,150
0,950 … 0,999	1,200
1,000 … 1,049	1,250
1,050 … 1,099	1,300
1,100 … 1,149	1,350
1,150 … 1,199	1,400

The existence of different tolerances allows the exact calibration of the thickness of the shim needed.

If the thickness needed is greater than those indicated on the table, two shims can be used that add up to the determined value. –  Once the necessary shim has been determined, remove the dial gauge. –  Remove the bolts that secure both casings and remove the gearbox casing. –  Separate the differential.

–  Remove the outer conical roller bearing track of the differential from the gearbox housing with the adaptor -U-40200/10- and the adaptor -U-40300/11-. –  Install the shim shaft with the calculated thickness (1.10 m in the example) in the housing of the differential outer roller bearing track in the gearbox casing. –  If it is necessary to fit two shims, place the thickest one first. –  Mount the outer conical roller bearing track of the differential on the gearbox housing with the adaptor -U-40200/10- and the adaptor -U-40300/12-. –  Fit differential into clutch housing. –  Assemble the gearbox casing on the clutch housing and tighten the securing bolts to corresponding torque.