Operator`s manual

2. Draw
the
tap and
sleeve
straight
out of the
bore
with
a
sharp quick
pull.
3.
Clean the
relief
valve bore
thoroughly
with
petroleum
solvent
and
a suitable
bristle
brush,
taking
care
to
see
that
all metal
particles
are removed.
The sleeve
seat
in
particular
must be
entirely
free
from foreign
matter,
or
new
sleeve
will not
seat properly.
4. Place
a new
relief valve
sleeve
into the
crankcase
bore
with
the seat
end of
the sleeve
toward
the
crankcase.
Make
sure
that the
sleeve
is centered
in
the bore,
insert
sleeve
driver
(ST-215)
in the
sleeve
and
drive
sleeve
into
place
with
light
hammer
blows
on
the driver.
5. If
the sleeve
does
not make
a 0.001
press
fit with
the
crankcase,
but
is loose,
remove
the
standard
size
sleeve
and
install
an
0.003
inch oversize
sleeve
exactly
as
describ-
ed
in Step "4"
above.
CAUTION
In the
event the
hole in
the crankcase
is too
small
for installation
of the
0.003
inch oversize
sleeve,
place the
sleeve
in
a lathe
and lap
it sufficiently
to fit
the hole
in
the crankcase.
Never
ream
the
oil
relief valve
sleeve
hole in
the crankcase.
7-57.
Oil Pressure
Relief
Valve
(adjustable).
The
latest
edi-
tion
of Service
Instruction
No. 1172
contains
the informa-
tion
relative
to
replacing
the
non-adjustable
oil
pressure
relief
valve
assembly
with
the
adjustable
oil
pressure
relief
valve
assembly
if required.
7-58.
Crankcase
- Fretting.
Consult
the latest
edition
of Ser-
vice Instruction
No. 1112
for information
relative
to inspec-
tion and
repair
of crankcases
damaged
by
fretting.
Section
7
Crankcase,
Crankshaft,
and
Reciprocating
Parts
OVERHAUL
MANUAL
TEXTRON
LYCOMING
DIRECT
DRIVE
AIRCRAFT
ENGINES
LEVER
HYDRAULIC
VALVE
HYDRAULIC
VALVE
COVER
OIL SEAL
Figure
7-15. Hydraulic
Valve
Assembly
7-62.
Expansion
Plug.
On engines
equipped
for fixed
pitch
propeller
use the expansion
plug installation
drift (P/N
64681)
to install
a
new expansion
plug
in place
in
the
front of
the
crankshaft
(see
figure
7-17)
with the
convex
side
toward
the
front. Be
sure the
plug
fits firmly
against
the shoulder
pro-
vided
for it
on the
inside
diameter
of the
crankshaft.
7-63.
Plug.
On
engines
equipped
for controllable
pitch
pro-
peller,
a plug
is installed
at
the rear
of the bore
in the
front
of the
crankshaft.
If this
plug
has been
removed
during
overhaul,
install
a new
plug by
sliding
it sideways
past
the
crankshaft
propeller
oil
tube
(see figure
7-17).
When
the
plug
is properly
positioned
in
the rear
of the
bore (flange
forward)
insert
the
oil plug
drift
(P/N
64770
for 1-3/4
inch
plug,
P/N
ST-46
for 1-3/8
inch
plug)
and seat
the
plug with
several
sharp
hammer
blows
on
the
drift.
NOTE
7-59. Crankcase
- Fretting.
The
latest edition
of
Service
In-
struction
No.
1123
contains
all
the requirements
necessary
to modify
the crankcase
to
prevent
fretting.
7-60.
Crankshaft
Idler
Gear
Shaft
Recess.
Damaged
or worn
idler gear
shaft
recesses
in the
crankcase
can
be repaired
as described
in Service
Instruction
No.
1197.
REASSEMBLY
7-61.
Crankshaft
Sludge
Tube
Assembly
(Where
applicable).
Support
the
crankshaft
in a
nearly
vertical
position
and in-
stall new
sludge
tubes.
Place a new
sludge
tube
on the ap-
plicable
drift,
P/N 64547
for
six and
eight cylinder
engines
and
P/N
64548
for
four cylinder
engines,
and
drive
sludge
tube to
its correct
depth.
See
figure 7-17
for four
cylinder
engines
and figure
7-18
for
six and
eight
cylinder
engines.
NOTE
Sludge tubes
are not
employed
in later
model
crankshafts.
However,
this
is not to
imply that
sludge
tubes
can be
removed and
not replaced
in
those
crankshafts
originally
using
sludge
tubes.
Some
crankshaft
employ
a 1-1/4
inch
plug.
This
size plug
cannot
be
replaced
in
the field.
The
crankshaft
must be returned
to
Textron Lycom-
ing for repair.
7-64. Propeller
Flange
Bushings.
If the
propeller
flange
bushings
have
been
removed
from
the
crankshaft,
new
bushings
must
be
installed.
Use
the
crankshaft
flange
bushing
replacement
tool
(ST-115)
to
install
new
bushings.
Consult
the
applicable
Parts
Catalog
for
proper
location
of the
bushings.
7-65.
Crankshaft
Gear.
Assemble
the gear
to
the crankshaft
using
both
a new
lockplate
and bolt.
Refer
to Figure
7-12F.
The
correct
bolt, lockplate
and
dowel
for
each
gear
are
shown
in
Table
7-4.
Tighten
the
bolt
to 125
inch
lbs. torque,
then
with
a hammer
and brass
drift,
tap
lightly
around
the
pilot
flange
of
the gear
and
listen
for sharp
solid
sounds
from
the
hammer
blows
that
would
indicate
that
the
gear
is
seated
against
the
crankshaft.
As a
check
on seating
against
the
crankshaft,
attempt
to insert
a
pointed
.001
inch
thick
feeler
gage
or shim
stock
between
the gear
and
crankshaft
at each
of
the three
scallops.
The
.001
feeler
gage,
or
any
smaller
feeler
gage,
must
NOT
fit between
the
two sur-
7-12
Revised
June,
1993