5-35. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
OVERHAUL - TIMING BLOWER ROTORS (Cont)
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 one rotor must be re- volved to obtain the proper
clearance, add shims back of the proper gear as shown be w to pro- duce the
desired result. When more or less shims are required, both gears must be removed
from the rotors. Placing a .003 inch shim in back of a rotor gear will revolve the
rotor .001 inch.
h. Install the required thickness of shims in back of the proper gear and next to the
bearing inner race and reinstall both gears. Recheck the clearances between the
Determine the minimum clearances at points "A" and "B". Insert the feeler gages,
between the end plates and the ends of the rotors. This operation must be
performed at the ends of each lobe, making 12 measurements in all. See below
for the mini- mum clearances.