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 5-71. .BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-DISASSEMBLY (Cont)
5. Blower
Wear eye protection when using compressed air.
a. Wash all blower parts in clean fuel
oil and dry with compressed air.
b. Examine the bearings for any
indications of corrosion or pitting.
Lubricate each bearing with light
engine oil; then, while holding the
bearing inner race from turning,
revolve the outer race slowly by
hand and check for rough spots.
c.
The double-row ball bearings are
pre-loaded and have no end play.
A new double-row bearing will seem
to have considerable resistance to
motion when revolved by hand.
d. Check the oil seal rings, carriers
and collars for wear and scoring.
If worn excessively, they must be
replaced. Inspection of the lip
type oil seal is covered in step 4n.
e. Inspect the blower rotor lobes,
especially the sealing ribs, for
burrs and scoring. Rotors must be
smooth for efficient operation of
the blower. If the rotors are
slightly scored or burred, they
may be cleaned up with emery cloth.
f.
Examine the rotor shaft serrations
for wear, burrs or peening. Also,
inspect the bearing and oil seal
contact surfaces of the shafts for
wear and scoring.
5-988
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