Crown Gear And Pinion; Differential Casing - Alfa Romeo alfa 33 Workshop Manual

Following fhe same procedure, reas-
semble the left hand differential
carrier.
I O . F i t o i l s u m p w i t h r e l e v a n t
sealing gasket.
CROWN GEAR
AND PINION
DISASSEMBLY
Crown gear
1.
Remove differential
from the gearbox-differential casing
( r e f e r t o : D i f f e r e n t i a l ' C a r r i e r s
2. Remove differential casing from
the gearboxdifferential casing (refer
to: Differential casing - Disassembly).
3. Loosen and remove the screws
securing the crown gear to the
differential casing and then remove
the crown gear.
Pinion
1. Remove gears from pinion shaft
and then withdraw the shaft from its
seat in the gearbox-differential cas-
ing, with relevant bearings (refer to:
Shafts and Gears).
CHECKS AND INSPECTIONS
Having thoroughly washed all parts,
proceed as follows:
1. Slowly rotate bearings checking
them for vibrations, noise or sticking.
2. Check surface of all rotating
parts and of roiling tracks for scores
or any evidence of abnormal wear,
pitting or overheating; in the affir-
mative, replace the parts involved.
3. Make sure that contact pattern
of bevel pinion teeth extends to their
entire working surface. If any of the
teeth are nicked, replace the pinion
and make sure the crown gear has
not been damaged as a consequence.
Check both toothings for scores
and any evidence of pitting or excess
wear.
ASSEMBLY
Crown gear
1 . F o l l o w i n g t h e p r o c e d u r e d e -
May 1983
GEARBOX
scribed in paragraph "Differential
Casing - Assembly", fit crown gear
to differential casing.
2. Fit differential casing back to
gearbox casing.
Pinion
Position the pinion into its seat in
the gearboxdifferential casing and fit
bearings and gears (refer to: Shafts
and Gears).
TESTING
Verify back-lash between crown gear
and pinion in four diametrically
carriers opposite positions. Irregular
lash, with excessive differences be-
tween the measured points, is an
indication of crown gear deformation
consequent flatness error
with
between gearbox casing/crown gear
place and differential casing plane.
Make sure the differential works
properly and is completely noiseless.
Incorrect assembly of' crown gear and
pinion or worn taper roller bearings
could be the cause of the trouble.
DIFFERENTIAL
CASING
DISASSEMBLY
1 . R e m o v e l e f t a n d r i g h t h a n d
differential carriers (refer to: Dif-
ferential Carriers - Disassembly).
2. Remove differential casing from
gearbox-casing,
1 D i f f e r e n t i a l
casing
2 R e t a i n i n g s c r e w
back-
3 C r o w n g e a r
4
Taper roller
bearing
1 3 - 2 2
3 . W i t h t o o l A . 3 . 0 2 8 7 r e m o v e
inner races of taper roller bearings
from the differential casing.
A.3.0287 1 1
4. Loosen and remove the screws
and washers securing the crown gear
to the differential casing.
Now remove the crown gear.
CHECKS AND INSPECTIONS
Having thoroughly washed all parts,
perform the following
operations:
1. Slowly rotate bearings checking
them for vibrations, noise or sticking.
2. Check the surface of all rotating
parts and of all rolling tracks for
scores and any evidence of abnormal
wear, pitting or overheating; in the
affirmative, replace the parts in-
volved.
3. Visually check gears, both plane-
tary and side gears, making sure that
there are no scores or evidence of
pitting, that contact pattern extends
to their entire working surface and
further that mating is noiseless and
smooth.
If necessary, replace the whole
differential casing; in this case also
replace taper roller bearings.
checking