Adjusting Drive Pinion And Ring Gear - Porsche 928 Workshop Manual

928
Differential/Transaxle System
39
ADJUSTING DRIVE PINION AND RING GEAR
General Information
Accurate adjustments of the pinion and ring gear are immensely important for the service
life and smooth running of the final drive. This is why pinions and ring gears are paired
during manufacture and checked in special machines for tooth pattern and quietness in
both directions of rotation. The position of smoothest running is determined by moving
the pinion in an axial direction, whereby the ring gear is lifted out of the no-play meshing
position far enough so that the backlash will be kept with specified tolerances. Deviation "r"
from the adjusting distance called for by design (design distance "R,") is measured and
recorded on face of drive pinion. Ring gears and pinions are designed so that deviation "r"
is always added to "R", i. e. is preceded by a + sign.
I
t
l.
873
ate
2
3
R, = Design distance 74.70 mm
r = Deviation from R in l/100 mm
1 = Deviation r
2 = Pair number
3 = Backlash
Printed in Germany VIII, 1984
Adjusting Drive Pinion and Ring Gear 39-127