Lycomin 0-360 - Cylinder and Turbocharger Maintenance

TEXTRON
LYCOMING
OPERATOR'S
MANUAL
0-360 and
ASSOCIATED
MODELS
SECTION
5
(1) Non-Adjustable
Oil
Pressure
Relief
Valve
- The
function
of the
oil
pressure
relief
valve
is to
maintain
engine
oil
pressure
within
specified
limits.
The valve,
although
not
adjustable,
may
control
the
oil
pressure
with
the
addition
of
a maximum
of nine
(9) P/N
STD-425
washers
between
the
cap
and spring
to increase
the
pressure.
Removal
of the
washers
will
decrease
the
oil pressure.
Some
early
model
engines
use a
maximum
of three
(3)
P/N STD425
washers
to increase
the
oil pressure
and the
use
of a
P/N
73629
or
P/N 73630
spacer
between
the cap
and crankcase
to decrease
the oil
pressure.
Particles
of metal
or other
foreign
matter
lodged
between
the
ball
and
seal
will
result
in faulty
readings.
It is
advisable
therefore,
to disassemble,
inspect
and
clean
the
valve if
excessive
pressure
fluctuations
are noted.
(2)
Oil
Pressure
Relief
Valve
(Adjustable)
- The
adjustable
oil
relief
valve
enables
the operator
to maintain
engine
oil
pressure
within
the
specified
limits.
If pressure
under
normal
operating
conditions
should
consistently
exceed
the
maximum
or minimum
specified
limits,
adjust the valve
as follows:
With
the
engine
warmed
up
and running
at
approximately
2000
RPM,
observe
the reading
on the
oil
pressure
gage.
If
the pressure
is
above
maximum
or below
minimum
specified
limits,
stop engine
and
screw
the
adjusting
screw
outward
to
decrease
pressure
or inward
to
increase
pressure.
Depending
on installation,
the adjusting
screw
may
have
only
a screw
driver
slot and
is
turned
with
a screw
driver;
or
may
have
the screw
driver
slot plus
a
pinned
.375-24
castellated
nut
and
may be
turned
with
either
a screw
driver
or a
box wrench.
4.
CYLINDERS.
It is
recommended
that
as
a field
operation,
cylinder
maintenance
be
confined
to replacement
of
the entire
assembly.
For
valve
replacement,
consult
the
proper
overhaul
manual.
This
should
be
undertaken
only as an
emergency
measure.
a. Removal of
Cylinder Assembly
-
(1)
Remove
exhaust
manifold.
(2)
Remove
rocker
box
drain
tube,
intake
pipe,
baffle
and
any clips
that
might
interfere
with
the
removal
of
the cylinder.
(3)
Disconnect
ignition
cables
and
remove
the
bottom
spark
plug.
5-7