Operator`s manual

3 l
1
2
0
4
Section
5
Accessory
Housing
OVERHAUL
MANUAL-
LYCOMING
DIRECT
DRIVE
AIRCRAFT
ENGINES
2
4
6 12
11
7
10
8
7 9
- 13
1.
Gasket
7.
Washer
2.
Brace
8.
Dual
Drive
Adapter
3. Cover
9.
Accessory
Drive
Gear
4.
Oil
Seal
10.
Dual
Accessory
Drive
Gear
5. Vacuum
Pump
and
Prop.
Gov.
Dual
Drive
Adapter
11.
Idler
Gear
6. Spacer
12. Vacuum
Pump Driven
Gear
13.
Vacuum
Pump
and
Hydraulic
Pump
Dual
Drive
Assembly
Figure
5-5.
Vacuum
Pump
and
Hydraulic
Pump
Dual
Drive
Assembly
(Engines
with
AN
fuelpump
drive)
and install
the
thrust
washer
and
retaining
ring
that
holds
the
idler
gear
on
the shaft.
Be
sure
that
a new
oil
seal
has
been
inserted
in
the
tachometer
drive
shaft
bore.
Rotate
the
oil
pump
drive
shaft
so
that
the
lobes
on
the
shaft
align
with
slots
in
the
crankshaft
gear.
Note
that
in
the
Dual
Magneto
Housing
the
oil
pump
drive
shaft
meshes
with
the
crankshaft
idler
gear.
5-29.
Apply
a liberal
coating
of engine
oil
to
thetach-
ometer
drive
shaft
and
all
other
contact
surfaces,
such
as gear
teeth
and
idler
gear
hub.
Carefully
fit
the
ac-
cessory
housing
in
place on
rear of
crankcase,
guiding
the
housing
first
over
the
tachometer
drive
shaft
and
then
on to
the
locating
dowels:
Secure
the
housing
in
place
with
ten
1/4-20
x
15/16
hex
head
bolts
and
two
1/4-20
x 1-3/4
bolts.
Two
ofthe
1/4-20
x 15/16
bolts
5-6
are
inserted
from
the
crankcase
side
through
holes
in
front
of
the
right
magneto.
The
two
1/4-20
x
1-3/4
hex
head
bolts
are
inserted
in the
two
holes
adjacent
tothe
left
magneto.
Assemble
allbolts
withplainwash-
ers
and
lock
washers.
5-30.
Vacuum
Pump
Drive.
See
figure
5-3.
If the
en-
gine
is equipped
with
a vacuum
pump
drive,
assemble
the
unit
as
follows:
Insert
a
new
oil
seal
(3)
into
the
recess
in
the
pump
side
of
the
vacuum
pump
adapter
assembly
(4).
Make
sure
that
seal
is
insertedwith
the
grooved
side
toward
the
adapter.
Place
a new
acces-
sory
driven
gear
washer
(5) over
the
shaft
of
the
vacuum
pump
driven
gear
(6),
lubricate
the
shaft,
and
insert
the
gear
into
the
adapter
being
careful
not
to push
oil
seal
out
of its
seat.
Using
a
new
gasket
attachthe
adapt-
er
tothe
upper
right
side
of the
accessory
housingwith
Revised
October
1974