Porsche 928 Workshop Manual page 870

39
Ulfferenlial / Transaxle System
ADJUSTING PINION AND RING GEAR
General Informarion
Accurate adjustments of rbe pinion and ring gear are immensely importanr for the service life and
smooth running of rhc final drive. This is why pinions and ring gears are paired during manufacture
and checked in special machines for tooth pa!tern and quietness in borh diret:iions of rotation. The
position of smoothes1 running is derermined by moving the pinion in an axial direction. whereby
the ring gear is lifled out of the no-play meshing poritiou far enough so that the backlash will be
kept within specified rolerances. Deviaion "I" from the designed distance "R" in measured and
recorded on face of pinion. Ring gears and pinions are designed so rhal deviation "r" is always
added to '7". i.e. is preceded by a + sign.
r
R----ci
+*
!l$-l.
'.I..
-t ..A
I
,
R = Design distance
12.70
mm
I = Deviation from R in l/100 mm
1 : Deviarion I
2 = Pair number
3 = Backlash
a
39 - 32
Adjuring Pinion and Ring Gear
Printed in Germany
(Automatic Transmission)