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(189)
REAR AXLE ASSEMBLY
REPAIRS
5-19
GAUGE J-2197
Figure S-2S-Micrometer Markings on Pinion Setting Gauges
J 681-A and J 2197
.381
.379
-2
THIMBLE
a
b
3.76
.379
+3
Nominal mi
crometer
r
eading
(fig. 5-26)
.
Pinion
marking (fig.
5-23)
.
Cor
re ct setting (micrometer
re
ading )
.
a. Pinion Setting Gauge
J
681 A
Has the thimble and slee
ve
of the micrometer
marked exactly like a
standard micrometer.
.
See figure 5-25. Wh
en
the thimble is turned
clockwise
t
o extend
the spindle,
the r
ead ing be-
comes less.
Consequently,
wh en this gauge is
used to measure depth of a
pinion marked
"+"
(plus)
,
the amount marked on the pinion tooth
must be subtracted
from
the
"
nominal"
microm-
eter
reading.
Likewise, if pinion is marked
"-" (minus), the amount marked on the
pinion
tooth must be add
ed
to
the "
nominal" microm-
eter
reading.
E
xample:
Figure S-2 4-Pinion Setting Ga ug e
This setting
may
vary a few
t
housandths of
an
inch f
r om the desi
gn or "nominal"
setting due
to allowable variation in machining the parts.
In order to make it possible to duplicate the
matching setting of the pinion
when
the gear
set is installed in a third member housing, the
pinion is marked to indicate this setting with
reference to the "nominal" setting. The amount
in thousandths of an inch plus or minus the
"nominal" setting is etched on the small end
of
one,
pinion tooth. See figure 5-23. When a
pinion is marked
"+"
(plus)
it means that the
pinion must be set at a distance from the cen-
terline of the ring gear equal to the "nominal"
setting plus the
amount
indicated on pinion
t
ooth.
When a pinion is marked "
-"
(minus)
it means that the pinion must be set at a
distance equal to the "nominal" setting minus
the amount indicated on pinion
tooth.
Pinion Setting Gauge J 681-A or J 2197 is
required in
order
to measure the pinion
setting
after it is installed in a third member
housing.
5-20
PINION SETTING GAUGES J 681
-A
AND
J 2
19 7
P
ini on Setting
Gauges J
681-A
and J
2197
are identi cal
except
for
the markings of the
micrometer secti on, as
described
below. Either
tool consists of a mi
cromet er gauge, a
checking
gauge, an adapter for use with hypoid gear
sets,
and a clamp to hold the adapter in posi-
tion.
The micrometer gauge has sliding stepped
collars so that gauge can be used in all
models.
The checking gauge should be used to test the
accuracy at zero of the micrometer gauge
before using the gauge. See figure
5-24.
b. Pinion
Setting Gauge
J
21
97
Has the
thimble
a
nd sleeve
of the
microm-
eter marked the opposite of a
standar d
microm-
et
er.
See
figure
5-25.
When
the
thimble is
turned
clockwise
to extend the
spindle, the
reading
becomes greater.
Consequentl y, when
this ga
uge
is
used t
o
measure depth of a pinion
marked
"+"
(plus) the amount marked on
the pinion tooth must
be added
to the "nom-
inal" micrometer
reading.
Likewise, if pinion
is marked "-" (minus), the amount marked
on the pinion tooth must be subtracted from
the "nominal" micrometer r
eading.
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