Operator`s manual

ASSEMBLE
CIRCLIP
WITH
SHARP
EDGE
OF
Figure
7-19.
Assembly
of Washer
and
Circlip
in
Counterweight
NOTE
Oil seal
rings
are
not
used
at center
sad-
dles
that
are
doweled
nor
at center
sad-
dles
on 0-320
and
0-360
wide
cylinder
fl-
ange
models
usingthru-studs
that are
not
attached
by
screw-threads.
7-79.
Remove
the hydraulic
tappet
bodies
from
the
cleaning
basket,
lubricate
as directed
in
paragraph
3-37,
and
place
in
proper
hole
in
the crankcase.
NOTE
If a
new or
reconditioned
camshaft
is tobe
used,
new
tappet
bodies
must
be used.
7-80.
Pre-lubricate
the
camshaft
lobes
and
bearings
as
directed
in
Paragraph
3-37.
Lay
the camshaft
in
position
in
the right
crankcase
half.
Loop
a soft
wire
around
an adjacent
cylinder
pad stud
in such
a man-
ner as to
holdthe camshaft
inplacewhenthe
crankcase
is turned
over.
See
figure
7-2.
7-81.
Pre-lubricate
the
main bearing
journals
of the
crankshaft
and
the rear
and
center
main bearing
in-
serts
in the
left crankcase
half.
Remove
the
front
main
bearing
halves
from
the
left crankcase
half and
coat
eachbearing
half liberally
and
assemble
the
bear-
ing on
the crankshaft.
Rotate
the
bearing
on
the jour-
nal
so
that the
three
oil
transfer
holes
will
be
upper-
most
when
the
crankshaft
is placed
in
the
left crank-
case half.
Pick
up the
assembled
crankshaft
by
the odd
numbered
connecting
rods
and
lower
the
crankshaft
into the
left crankcase
half
permitting
the
even num-
bered
rods
to
protrude
through
their
respective
cyl-
inder
mounting
pads.
Using
the reference
marks
made
previously,
adjust
the
front
main
be aring
so
that the
halves
are seated
squarely
on the
locating
dowels.
7-82.
Seefigure
7-24.
If
either
the crankcase
or
crank-
shaft
has
been
replaced,
the
crankshaft
end
clearance
must
be
checked.
When
crankshaft
is located
in the
left
crankcase
half,
push
the crankshaft
forward
as
far as
possible.
Check
the
clearance,
at the
rear
of
the front
mainbearing
surface,
between
the crankcase
and
crankshaft
shoulder.
(Point
"A").
If
clearance
exists between
crankcase
and crankshaft
thrust
surface
Section
7
OVERHAUL
MANUAL
Crankcase,
Crankshaft,
and
Reciprocating
Parts
LYCOMING
DIRECT DRIVE
AIRCRAFT ENGINES
(Point
A) regrind
the
front
face
of the
crankshaft
slinger
(Point
"B")
to
remove
the
clearance.
Grind
only
that
amount,
from
the
face
of
the slinger,
necessary
to
remove
clearance.
Push
the
crankshaft
as far
as
pos-
sible
to
the
rear
of
crankcase.
Check
the
clearance
betweenthethrust
surface
of
crankshaft
and
crankcase.
7-83.
Pre-lubricate
the
main
bearing
inserts
of
the
right
crankcase
half.
7-84.
Apply
a
film
of non-hardening
gasket
compound
to
the
outside
mating
surfaces
of
eachcrankcase
half.
The
compound
must
not
be
applied
to any
of
the
inter-
ior
mating
surfaces
such
as
the
bearing
support
webs.
Next
imbed
a length
of
"oo"
silk
thread
in the
gasket
compound
along
outside
edge
of left
crankcase
half.
Run
the
length
of
thread
so that
it
is on
both
sides
of
bolt
hole
without
touching
each
other.
An
alternate
method
of sealing
is
discussed
in
Service
Instruction
No.
1125.
7-85.
Lowerthe
right
half
of the
crankcase
so thatthe
studs
align
properly
with
the left
half.
If necessary,
tapthe
right
half
gently
with
a soft
hammerto
facilitate
assembly.
However,
no difficulty
will
be
encountered
if
the
two
halves
are
kept
parallel
while
the
right
is
being
lowered
onto
the left.
After
the
cases
are
to-
gether,
tap
the
right
half
with
a
soft
hammer
to
seat
it securely
all
around.
NOTE
Crankcases
that
are
doweled
at the
thru-
studs
can
only
bebrought
together
as
des-
cribed
above
to
a point
where
the
dowels
are
encountered.
At
that
point
assemble
the
pressure
plate
as
described
in figure
7-16
and complete
the assembly.
7-86.
Installall
crankcasefastenings.
Consult
the ap-
plicable
Parts
Catalog
for
correct
attaching
parts.
7-87.
In order
to insure
uniform
loading
on the
main
bearings,
it is
necessary
to tighten
the studs
and
bolts
in the
following
sequence.
Figure 7-20.
Location
of
Gap
When
Installing
Retaining
Rings
7-16
Revised
October
1974