Lubricate the O-rings with clean engine oil, then slide one ring on each shaft.
Lubricate and place a seal on each shaft. Note that the tangs on each seal are flush with one
side of the seal; this side of the seal must face toward the rotor.
Place the front end plate on two woodblocks. Then install the rotors, gear end up, on the end plate
(Fig. 7). On the former blowers, be sure that the ring-type oil seals are properly positioned on the rotors.
Install the blower housing over the rotors (Fig. 8).
To prevent inadequate lubrication or low oil pressure, care
must be exercised in the assembly of the front and rear blower
end plates to the blower housing.
Figure 7. Installing Blower Rotors in Front-End Plate
Figure 8. Installing Blower Rotors in Front-End Plate
Place the rear end plate over the rotor shafts (Fig. 9). On the former blowers, be sure that the ring-
type oil seals are properly positioned on the rotors. Secure each end plate to the blower with four end plate
cover bolts and plain washers.
Attach the two thrust washers to the front end of the blower with the washer retaining bolts. If 5/16-
24 bolts are used, tighten them to 25-30 lb ft (34-41 Nm) torque; if 3/8-24 bolts are used, tighten them to 54-59
lb ft (73-80 Nm) torque.
Attach the three spacers and the thrust plate to the front end of the blower. Tighten the three bolts
to 7-9 lb ft (10-12 Nm) torque. Then check the clearance between the thrust plate and the thrust washers. The
specified clearance is 0.001 to 0.003 inch.