Engine Blower Assembly

housing. The clearance between rotors may be

bolts uniformly until gears are tight against the

established by moving one of the helical gears out

shoulders of shaft. Remove gear bolts, plain

or in on the shaft relative to the other gear. Moving

Washers and cloth.

gears "out" or "in" on the rotors is accomplished

(10) Place the pilot in the counterbore of gears

by adding or removing shims between gear hub and

and start the twelve point bolt in the right-hand

rotor spacers.

rotor shaft and start the hex head bolt in the left-

hand rotor shaft. Tighten the bolts to 25-30 ft-lb

(13) Measurements should be taken from both

the inlet and outlet sides of blower by inserting

feeler gage between housing (29) and rotors (32).

(11) Check the backlash between blower gears

Measurements should be taken across the entire

(12) After the blower rotors and gears have

length of each rotor lobe. Refer to table 1-1 for

been installed, the blower rotors must be timed.

proper clearance.

Rotors, when properly positioned run with a slight

f. Installation. Installation is the reverse

clearance between the rotor lobes and with a slight

procedure of removal. Replace all gaskets.

clearance between the lobes and the walls of the

3-9