Blower Assembly - TM-10-3930-242-340043

TM 10-3930-242-34

Figure 3-3. Oil cooler, removal and installation.

( 2 ) Use two pullers to remove both blower

(3) Inspect springs for cracks and bends.

g e a r s from rotor shaft at the same time. Mark

( 4 ) Inspect all mounting hardware for de-

t h e upper rotor gear to facilitate identification

f e c t s and wear. Replace a defective part.

a t reassembly.

e. Reassembly. Refer to figure 3-6 and reas-

s e m b l e the air inlet housing.

d. Cleaning and Inspection.

f. Installation. Refer to figure 3-5 and install

(1) Clean the blower assembly components,

a i r inlet housing.

using a dry cleaning solvent such as P-D-680 or

equal.

3-5. Blower Assembly

( 2 ) Inspect the rotors and housing for deep

a. General. The blower assembly is located

scratches. If deep scratches exist, dress the

behind the air inlet housing. It supplies the

parts down.

f r e s h air required for combustion and scaveng-

( 3 ) Inspect the rotors for scoring.

ing. The revolving motion of the rotors provide a

(4) Check for leaking oil seals.

c o n t i n u o u s and uniform displacement of air.

(5) Check for loose or worn rotor shaft and

b. Removal.

r o t o r shaft bearings. See table 1-1 for replace-

(1) Remove

fuel

filter

(TM

the

ment standards.

10-3930-242-12).

NOTE

(2) Refer to figure 3-5 and remove the

Loose rotor shafts or worn rotor shaft bearings

b l o w e r assembly.

will result in contact between rotor lobes, rotor,

c. Disassembly. Refer to figure 3-7 and disas-

and end plates or rotor and housing, Excessive

s e m b l e blower assembly as follows:

backlash between blower timing gears usually re-

(1) Wedge a clean cloth between the blower

sults in rotor lobes rubbing together throughout

their entire length.

rotors to prevent their turning and remove

e. R e a s s e m b l e . Refer to figure 3-7 and reas-

blower drive cam retainer and blower drive

semble as follows:

s p r i n g support to rotor gear.

3-3