RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
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‹› If measurement is repeated, differential must first be rotated 5 complete revolutions in both directions again to seat tapered roller bearing.
Formula: "Stotal" = "S2* " + measured value + bearing preload
Determining thickness of adjustment shim "S 1*"
‹› Initial shim "S1*" is replaced with final shim "S1" after backlash has been determined.
‹› The total shim thickness "Stotal" remains unchanged.
Formula: "S1*" = "Stotal" - " S2*"
Torsional backlash, measuring
‹› Drive shaft installed with shims "S3" and " S4".
‹› O-ring is inserted in final drive cover.
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Install differential with ring gear: "S1" is on cover side, "S2" is installed in transmission housing.
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Install transmission cover and tighten bolts to 24 Nm.
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Insert locking sleeve (VW 521/4) and (VW 521/8).
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Turn differential 5 turns in both directions so that the taper roller bearings settle.
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Secure dial gauge holder (VW 387) to transmission housing.
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Insert dial gauge with extension pin (VW 382/10 ) (6 mm).
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Set measuring lever (VW 388) to dimension "a" = 75 mm (for ring gear dia. 186 mm).
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Determine play between teeth flanks as follows: