20
CHAP
TE
R ONE
I II
Bearing
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p
l,lller
~
100
0
00 0 1
+--
--1-
1- Shaft
F,t~
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--1
1-
Spac
er
I
r
p
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l~~~~l
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>=
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-
Beaarlng
3. Step 1 describes how 10install a bearing in a case half
and over a shaft. However, when installing a bearing over
a shaft and into a housing at the same time, a snug
fit will
be required for both outer and inner bearing races. In this
situation, a spacer must be installed underneath the driver
tool so that pressure is applied evenly across both races.
Sec Figure 56. If the oute r race is not supported as shown
in Ffgu re 56, the balls will push against the outer bearing
track and damage it.
Sh rink Fit
1. Ins/a iling a
bear
ing
over
a
shaft
- If a tight fit is re-
quired. the bearing inside diameter will be smaller than
the shaft. In this case, driving the bearing on the shaft us-
ing normal methods may cause bearing damage. Instead,
the bearin
g:
should be heated before installation. Note the
following:
a. Secure the shaft
so that it can be ready for bearing
installation.
b. Clean the bearing surface on the shaft
of
all residue.
Remove burrs with a file or sandpaper.
c. Fill a suitable pot or beaker with clean mineral oil.
Place a thennomctcr (rated higher than 120
0
C
[248
0
F]) in the oil. Support the thermome ter so it
does not rest on the bottom or side
of
the pot.
d. Remove the bearing from its wrapper and secure it
with a piece
of
heavy wire bent to hold it in the pot.
Hang the bearing in the pot so that it does not touch
the bottom or sides
of
the pot.
e. Tum the heat on and monitor the thermometer.
When the oil temperature rises to approxi mately
120
0
C (248
0
F), remove the bearing from the pot
and quickly install it. lf'nccessary, place a socket on
the inner bearing race and tap the bearing into place.
As the bearing cools, it will tighten on the shaft
so
work quickly when installing it.Makesure the bear-
ing is installed all the way.
2. Installing a bearing in a housing
-Bearing
s are gener-
ally installed in a housing with a slight interference fit.
Driving the bearing into the housing using normal
meth-
ods may damagethe housing or cause bearingdamage. In-
stead, the housing should be heated
bef
ore the bearing is
installed. Note the following:
CAUTION
Before heating the housingin thisprocedure
to
remove the bearings, wash the housing
thoroughly
with detergent
and
water. Rinse
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