Inspection
Clean the parts with fuel oil and dry
them with compressed air. Ensure that
t h e o i l g r o o v e s , o i l holes and cavities are
free of dirt.
Replace the thrust washers if they are
worn or scored.
If the bearings are worn or scored ex-
cessively the drive gear hub support or
bearings will have to be replaced. These
bushing type bearings are diamond bored
to
an i n s i d e d i a m e t e r o f 1 . 6 2 6 0 " t o
1.6265" after installation in the hub.
The clearance between the bearings and
the hub is 0.0010" to 0.0025" with new
parts and a maximum of 0.0050" with
used parts.
Figure 11B-170. Blower Drive Support
The bearing on the gear end protrudes
0.045" to 0.055" above the surface of the
washer (56) and withdraw the blower
face to facilitate the installation of blower
drive gear hub.
thrust washer (102). The other bearing
is installed with the end flush to 0.030"
4. Remove the thrust washer from the
below the surface of the face of the sup-
blower
drive
gear
(see
port.
Replacement
hub
bearings
must
withstand 2000 lb end load without mov-
ing, also the bearing bores must be
5. Press the gear hub out of the blower
square with the inner and outer faces of
drive gear.
the support within 0.001" total indicator
reading.
Replace the blower drive shaft if the
serrations are worn or damaged.
Inspect the blower drive coupling sup-
cam,
spring seats and spring
port,
packs. Replace worn or damaged parts.
The blower drive coupling incorporates
spring seats which prevent pressure and
Figure 11B-172. Blower Drive Shaft
Mounting
Figure 11B-171. Blower Oil Line
Engine (Less Major Assemblies)