Note: Before checking the contact pattern, make sure that tooth backlash (provisional, if necessary) is correct.
Note: The contact pattern is adjusted by means of the shim washer (1) on the input bevel pinion.
Clean and degrease tooth flanks of crown wheel and bevel gear.
Coat three tooth flanks of the crown wheel with marking ink.
Install measuring fixture, BMW # 33 2 600, centre crown wheel and use the balls of your hands to press it into the housing and turn it back and forth a few times.
If the correct shim is installed, the following contact pattern appears with no load applied.
Note:
- The contact pattern is centered on leading flank «V».
- The contact pattern is closer to the larger diameter on trailing flank «R».
Caution! Make sure that teeth are not in contact at the smaller diameter.
Install a thinner shim if the contact pattern looks like this.
Install a thicker shim if the contact pattern looks like this.
Clean the tooth flanks.