RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
-
Turn ring gear until it makes contact with a tooth flank (end of backlash travel).
-
Set dial gauge to "0" with 2 mm pre-load.
-
Turn ring gear back until lying against an opposite tooth flank (backlash).
-
Read off backlash and note measured value.
-
Turn ring through 90° and repeat measurements 3 times.
‹› If drive pinion - 1 - turns when measuring, counter hold drive pinion so that an exact torsional backlash can be measured.
Determining average backlash
-
Add four measured values together and divide total by 4 to determine average.
‹› Result: Average backlash is 1.16: 4 = 0.29 mm
‹› If measurements vary more than 0.06 mm from each other, ring gear or gear set is not installed correctly. Check installation, replace final drive set
if necessary.
Determining thickness of adjustment shim "S 2"
Formula: "S2" = "S2* " - measured torsional backlash + specified torsional backlash
-
Determine shim(s) according to table.
Available adjustment shims for "S2"
*
Using shim tolerances it is possible to find the exact shim thickness required, insert two shims if necessary.
Determining thickness of adjustment shim "S 1"
Formula: "S1" = "Stotal" - " S2"