Chevrolet 1977 10 Series, Руководство по ремонту, Страница: 91 / 468

REAR AXLE DIFFERENTIAL
4B-19
places and average these read in g s. R ecord the
result.
b. A dd together the d im e n sio n s o f the Service
Shim , Service S pacer a n d F eeler G auge. R ecord
the result.
9. U se the sam ple p ro ced u re in F ig u re 7B to
d eterm in e the p ro p er thickness fo r each shim pack.
N O T E : P roduction p re lo a d in g o f the differ­
en tial b earings is accom plished by the use o f
cast iron p relo ad shim . T hese shim s can n o t
be used w hen reb u ild in g the c a rrie r as they
m ay break w hen tap p ed in to place.
10. Install left shim first, th en w edge rig h t shim
betw een b earin g cup a n d spacer. P osition shim so
th at c h a m fe red side is o u tw ard o r next to spacer. If
shim does not have sufficient c h a m fe r o r lead
aro u n d O .D . to allow easy in sta lla tio n w ith o u t
scraping spacer, file o r g rin d c h a m fe r before
installing.
11. If difficulty is en co u n tered in in stallin g shim ,
p a rtially rem ove case an d slide case and shim into
position. T ap shim into position, using a soft faced
h am m er, w hile ro tatin g d ifferen tial case w ith free
h an d as shown in F igure 9B.
12. Install b e arin g caps in o rig in a l p o sitio n an d torque
to 60 ft. lbs.
N O T E : At this point, the d ifferen tial side
b earin g s are p ro p erly p relo ad ed . If any
adju stm en ts are re q u ire d in la te r procedures,
m ake sure the p relo ad re m a in s as established
in step 9. If backlash is ch an g ed in later
steps, be sure the
total
thickness o f the two
shim packs does not change.
13. M ount a dial in d icato r on the c a rrie r an d check the
backlash betw een the rin g g e a r an d pin io n , as
shown in Figure 10B. T he backlash should be
w ith in the ran g e o f 0.005"-0.008". Check g ear lash
Fig. 9B —In s ta llin g D iffe re n tia l Shim
at fo u r different equally spaced positions a ro u n d
the gear. V a ria tio n in re a d in g s should not exceed
.
002
" .
N O TE: P osition the d ial in d ic a to r so th at
in d icato r b u tto n is p e rp e n d ic u la r to tooth
angle and in line w ith g e a r ro tatio n .
14. If v a ria tio n in backlash re a d in g s exceeds .002";
m easure rin g g e a r and case ru n o u t as shown in
F igure 11B. G e a r ru n o u t should not exceed .003";
should ru n o u t exceed this lim it, check rin g gear and
case fo r d e f o rm a tio n a n d / o r fo re ig n m a tte r
betw een case a n d gear.
15. If g ea r lash is n o t w ith in lim its, correct by
d ec re a sin g shim
th ick n e ss on one side an d
increasing thickness o f o th e r shim
the same
amount
T otal shim thickness m ust be m ain ta in e d
at all tim es to m a in ta in p ro p e r p relo ad .
16. Backlash changes a p p ro x im a tely .002" fo r each
.003" change in shim d im ensions.
Fig. 8B—Measuring Gauge Plate Thickness Fig. 10B—Checking Ring Gear Backlash