seat Workshop Repair Guides

SEAT Workshop Service and Repair Manuals

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Thickness of shim ?S2?: determine > < Total disc thickness ?Stotal? (?S1? + ?S2?): determine

Leon Mk2

Backlash: measure
Backlash: measure
l  Pinion shaft is fitted with shims „S3“ and „S4“.
–  Install the differential with crown wheel: S1* is fitted on cover side, S2* in gearbox housing.
–  Fit cover for final drive and tighten bolts to 20 Nm.
–  Insert crown wheel adjusting tool -VW 521/4- and -VW 521/12-.
–  Turn differential 5 turns in both directions so that the tapered roller bearings seat properly.
   
–  Secure universal dial gauge bracket -VW 387- to housing.
–  Fit dial gauge with dial gauge extension -VW 382/10- (6 mm flat).
–  Adjust measuring lever -VW 388- to distance „a“ = 79 mm (for Ø 188 mm crown wheel).
–  Measure play between teeth faces (backlash) as follows:
–  Turn crown wheel until it makes contact with the face of one tooth (end of backlash travel).
–  Adjust the dial gauge to „0“ with a pre-tension of 2 mm.
–  Turn back crown wheel until it makes contact with opposite tooth face (backlash).
–  Take backlash reading and note down measured value.
–  Turn crown wheel through 90° and repeat measurements a further 3 times.
Determining average backlash
–  Add the 4 measured values together and divide by 4.
  A39-10025
Example: 
 1. Average value0.28 mm
+2. Average value0.30 mm
+3. Average value0.30 mm
+4. Average value0.28 mm
=Sum of measured values1.16 mm

l  Result: The average backlash is 1.16 divided by 4 = 0.29 mm
  Note
If the individual measurements differ from each other by more than 0.06 mm, the installation of the crown wheel or the final drive gear set itself is not correct. Check installation; renew final drive gear set if necessary.
   

Thickness of shim ?S2?: determine > < Total disc thickness ?Stotal? (?S1? + ?S2?): determine