5-8. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
Wear protective eye goggles when using compressed air.
a. Wash all of the blower parts in
clean fuel oil and dry them with
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
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 6 m.
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
lightly scored or burred, they may
be cleaned up with emery cloth.
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.