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TM 55-1905-220-14-11
5-71. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-TIMING BLOWER ROTORS (Cont)
If possible, keep this clearance
to the minimum (.002"). Then,
check the clearance between the
LEADING edge of the right-hand
helix rotor and the TRAILING edge
of the left-hand helix rotor for
the minimum clearance of (.012").
Rotor-to-rotor measurements should
be taken 1" from each end, and at
the center of the blower.
NOTE
If the proper clearances cannot be obtained between
the rotors, a mix of the former and current rotors,
which have a different helix angle, may have occurred.
g. After determining the amount that
one rotor must be revolved to
obtain the proper clearance, add
enough shims back to the proper
gear as shown below to produce the
desired result. When more or less
shims are required, both gears must
be removed from the rotors. Placing
a .003" shim in back of a rotor gear
will revolve the rotor .001".
5-1010


 


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