Chevrolet 1977 10 Series, Руководство по ремонту, Страница: 123 / 468

REAR AXLE DIFFERENTIAL
4B-51
the drive pinion. Install a new collapsible spacer
into position.
6. Press fro n t b earin g onto drive pin io n .
7. L ubricate the oil seal lips w ith a lithium -base
extrem e pressure lu b rican t, an d install the seal in
the re ta in e r bore. Use J-24434 w ith d riv er h an d le
J-8092. Press the seal in to the bore until it seats
ag ain st in te rn al shoulder.
8. Install p in io n flange a n d oil deflector onto the
splines, then install lock w ash er an d new p in io n nut.
9. C lam p the p inion flange in to a vise. Install J-8614-
l l as in figure 8E. T ig h te n the n u t to achieve
p ro p e r b earin g preload.
a. P ro p er preload is a tta in e d w hen ro ta tio n a l
torque required to ro ta te the p in io n is 25-35 in.
lbs. fo r new bearings, o r 5-15 in. lbs. fo r used
bearings.
b. T ighten p inion nut to a p p ro x im ately 350 ft. lbs.,
then take a torque re a d in g as show n in figure
15E, using J-5853.
c. C o n tin u e tig h te n in g p in io n n u t in sm all
increm ents until p ro p e r p re lo a d is attain ed .
CAUTION: Over-tightening o f pinion nut may
collapse spacer too much, requiring its
replacement.
Installation and Adjustment
1. E xam ine the head o f the drive p in io n fo r a p in io n
d ep th code num ber.
2. C om pare the d epth code n u m b e r w ith the n u m b er
on the o rig in al pinion. Use the follow ing ch art to
select the p ro p e r shim fo r p re lim in a ry setting o f
p in io n depth.
3. R efer to the thickness o f the shim recorded ea rlie r
in P inion R em oval procedures. Increase or decrease
CODE NUM BER ON O R IG IN A L PIN IO N
+2 + 1 0 -1 -2
+ 2
-
A D D .001 A D D .002 A D D .003 A D D .004
CODE
NUM BER
+1
SUBT.
.001
-
AD D
.001
A D D
.002
AD D
.003
ON
SERVICE
PINIO N
0
SUBT.
.002
SUBT.
.001
-
AD D
.001
AD D
.002
-1
SUBT.
.003
SUBT.
.002
SUBT.
.001
-
A D D
.001
- 2
SUBT.
.004
SUBT.
.003
SUBT.
.002
SUBT.
.001
-
Fig. 16E—Pinion Depth Codes
the shim d im en sio n as in d ic ate d by the ch a rt in
figure 16E.
a. F o r exam ple, if o rig in a l shim m easu red .014
inch, o rig in al code w as —1 a n d new code is + 2 ,
the correct shim w ould be .014 inch plus .003 =
.017 inch.
b. If o rig in al shim w as .012 inch, o rig in al code
+ 2, a n d new code is —2, the correct shim would
be .012 m inus .004 = .008 inch.
4. Place the p in io n shim as d e te rm in e d in step 3 onto
the ca rrie r housing, m ak in g sure the bolt holes
align w ith those o f ca rrie r, a n d th a t the m ating
surfaces are clean and free fro m fo reig n m aterial.
5. Place the p in io n re ta in e r assem bly into position,
and align bolt holes to c a rrie r. Install re tain in g
bolts and tig h ten in a crosswise m an n er. T orque to
specifications.
6. Follow ing drive p in io n service, a C ontact P attern
Check m ust be m ade.
CHECKS AND ADJUSTMENTS
F o u r adjustm ents are essential fo r p ro p e r o p e ra tio n o f
the differential and its rela ted p arts. T hese adjustm ents
are a) Pinion B earing P reload, b) Side B earing Preload,
c) P inion D ep th and d) R ing G e a r-to -P in io n Backlash.
P in io n B earing P reload is set to specifications in step 9
o f "D riv e P inion R eassem bly".
Side B earing Preload is set to specifications in step 6 o f
"D iffe ren tial C ase—In stallatio n an d A d ju stm en t".
Follow ing service to the D ifferen tial assem bly or to the
D rive P inion, the P in io n D e p th an d the R in g -G ear-to -
Pinion Backlash
must
be checked, using a G e a r T ooth
C ontact P attern Check as o u tlined below.
Fig. 15E—Measuring Rotating Torque
Gear Tooth Contact Pattern Check
P rio r to final assem bly o f the d ifferen tial, a G e a r T ooth