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FRONT SUSPENSION
2 - 33
DIAL INDICATOR
Fig. 31 Ring Gear "Runout
39
Measurement
and a t a r i g h t angle (i.e., perpendicular) to the back
side of t h e r i n g gear. "Zero" t h e d i a l indicator
pointer.
(9) Measure the r i n g gear " r u n o u t " b y r o t a t i n g the
r i n g gear several complete revolutions and observing
the d i a l indicator pointer. M a r k both t h e r i n g gear
and t h e differential case flange at t h e location o f
m a x i m u m " r u n o u t " .
T h e m a r k o n t h e d i f f e r e n t i a l case f l a n g e w i l l
b e v e r y u s e f u l w h e n m e a s u r i n g t h e d i f f e r e n t i a l
case
" r u n o u t " . T h e d i f f e r e n t i a l
case
f l a n g e
" r u n o u t " m e a s u r e m e n t
p r o c e d u r e
i s d e s c r i b e d
b e l o w .
I f t h e c o m b i n e d r i n g g e a r " r u n o u t " (i.e., p e a k -
t o - p e a k ) e x c e e d s o f 0.006 i n c h (0.150 m m ) , p o s s i -
b l e causes c o u l d b e t h a t t h e r i n g g e a r i s n o t
t i g h t l y a t t a c h e d t o t h e d i f f e r e n t i a l case flange o r
t h e d i f f e r e n t i a l case i s d a m a g e d .
(10) Determine i f the clearance between the differ-
e n t i a l bearing caps and bearing cups is excessive b y
a t t e m p t i n g t o insert a 0.003- inch (0.076-mm) t h i c k
feeler gauge blade between t h e m . N o r m a l l y , a 0.003-
i n c h (0.076-mm) t h i c k feeler gauge blade should be
too t h i c k t o be inserted between a bearing cap and
cup.
I f t h e c l e a r a n c e i s m o r e t h a n 0.003 i n c h (0.076
m m ) , t h e c a u s e c o u l d b e t h a t t h e a p p l i c a b l e
b e a r i n g c u p r o t a t e d i n t h e d i f f e r e n t i a l h o u s i n g
" s e a t " a n d c a u s e d e x c e s s i v e w e a r .
(11) Note the i n s t a l l a t i o n reference letters stamped
into the differential bearing caps and i n t o the differ-
e n t i a l housing machined sealing surface (Fig. 32).
The letters are stamped horizontally on the left side
and are stamped v e r t i c a l l y on the r i g h t side of the
differential housing. A l w a y s match the reference let-
ters when i n s t a l l i n g the differential bearing caps.
(12) Remove the differential bearing caps.
(13) Position Spreader Tool W-291-A on the differ-
e n t i a l housing w i t h the tool dowel pins "seated" i n
Fig. 33 Differential Housing Separation
the l o c a t i n g holes ( F i g . 33). I n s t a l l t h e holddown
clamps
a n d t i g h t e n t h e tool turnbuckle
"finger-
t i g h t " .
(14) I n s t a l l a p i l o t stud a t the left side of the dif-
f e r e n t i a l housing. A t t a c h D i a l Indicator Tool C-3339
to the differential housing (via the pilot stud) w i t h
the i n d i c a t o r plunger s l i g h t l y "loaded" against t h e
opposite side of the differential housing (Fig. 33).
"Zero" t h e d i a l indicator pointer.
CAUTION: Do not exceed the specified separation
distance when separating the differential housing. If
the housing is over-separated, it could be distorted
or damaged, which would necessitate replacement.
(15) T i g h t e n the spreader tool t u r n b u c k l e (Fig. 33)
and separate the differential housing only enough to
remove the differential case from the housing. Sepa-
r a t e t h e d i f f e r e n t i a l h o u s i n g a m a x i m u m d i s -
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