B. Align the dowel pin holes in the blow-
er housing with the pins and push the
housing tight against the end plate.
If necessary, tap the housing lightly
with a plastic hammer.
4. Install the blower front end plate on
the rotors and housing as follows:
A. Check the dowel pins. The dowel
pins must project 0.380" from the flat
inner face, and 0.270" from the outer
face of the front end plate to assure
proper alignment of the end plate to
the housing and the cover to the end
plate.
B. Lubricate the oil seal rings in the
carriers on the rotor shaft with en-
gine oil.
C. Position the oil seal rings in the car-
riers so the ring protrudes from its
groove the same amount on each side.
D. Position the front end plate over the
top of the rotor shafts with the inner
face of the end plate facing the rotors
and the mark "TOP" on the end plate
at the flange side of the housing as
in
Figure 11D-16 on page
Figure 11D-15. Installing Blower
shown
11D-12.
R o t o r in Rear End Plate
carefully apply pressure to the seal
E. Lower the end plate straight over the
ring approximately 180 from the gap
rotor shaft until the dowel pins in the
while gently working the seal ring in-
end plate contact the blower housing.
to the collar until the rotor contacts
Then carefully work the dowel pins
the end plate.
into the dowel pin holes in the hous-
ing a n d t h e o i l s e a l r i n g s i n t o t h e
collars.
F. Repeat Steps C and D above on the
Push the end plate tight
left hand helix rotor.
against the housing.
If necessary,
tap the end plate lightly with a plastic
G. Position the two rotors together so
hammer.
the lobes are in mesh and the omitted
F. Insert the two fillister head screws
s e r r a t i o n in s p l i n e s o f b o t h s h a f t s
through
the front end plate and
face toward the top of the end plate.
thread them into the housing. Tight-
Then start the splined end of the
shaft straight into the left hand shaft
en the screws to 5-10 lb-ft (7-14 Nm)
Do not use lock washers on
opening in the end plate. Continue to
these screws.
lower the rotor in place as outlined in
S t e p E.
I n s t a l l e r Blower Rotor Shaft Bearings
3. Determine the rotation of the blower
and Gears
being assembled, then install the blower
housing over the rotors as follows:
1. With the blower housing, rotors and
end plates supported in a vertical posi-
A. Position the blower housing above the
tion on the two wood blocks, install the
rotors with its mounting flange facing
roller bearings on the rotor shafts and in
toward the right hand helix rotor.
the front end plate as follows:
Lower the housing over the rotors un-
til it contacts the dowel pins in the
A. Lubricate one of the roller bearings
end plate.
with engine oil.
Start the bearing,
Air Intake System
