Checking Tooth Contact Pattern - BMW R 1150 RT Repair Manual

Checking tooth contact pattern

•
The contact pattern must be checked whenever
the gearset, the housing or the drive pinion bear-
ing is replaced.
L
Note:
Before checking the contact pattern, make sure that
tooth backlash (provisional, if necessary) is correct.
L
Note:
The contact pattern is adjusted at 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 No. 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 con-
tact pattern appears with no load applied.
L
Note:
The contact point is central on front flank "V".
The contact pattern is closer to the larger diameter
on trailing flank "R".
e
Teeth should never make contact at the smaller di-
ameter.
1
•
This contact pattern indicates that a thinner
spacer shim should be installed.
KR330250
•
This contact pattern indicates that a thicker
spacer shim should be installed.
•
Clean the tooth flanks.
V
R
KR330260
Attention:
KR330270
KR330280
33.15