5-8. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
OVERHAUL - TIMING BLOWER ROTORS (Cont)
If the right hand helix gear is moved out, the right
hand helix rotor will turn counterclockwise when
viewed from the gear end. If the left hand helix gear
is moved out, the left-hand helix rotor will turn
clockwise when viewed from the gear end. This
positioning of the gear, to obtain the proper clearance
between the rotor lobes, is known as blower timing.
d. Moving the gears out or in on the rotor shafts is
accomplished by adding or removing shims between
e. The clearance between the rotor lobes may be checked
with 1/2" wide feeler gages in the manner shown below.
When measuring clearances of more than .005",
laminated feeler gages that are made up of .002",
.0035" or .005" feeler stock are more practical and
suitable than a single feeler gage. Clearances should
be measured from both the inlet and outlet sides of the