Cessna 152 - Page 175

PILOT'S
OPERATING
HANDBOOK
SUPPLEMENT
SECTION 7
O-235-N2C
ENGINE
MODEL
152
AIRPLANE
&
SYSTEMS DESCRIPTIONS
INTRODUCTION
The
descriptions
and
operational
information
contained
in
Section
7
of
the
basic
handbook
generally
are
applicable
to
Model
152
airplanes
mod-
ified
with
an
O-235-N2C
engine.
The
additional
or
changed
information
which
specifically
describes
O-235-N2C
engine
modification
differences
are
presented
in
this
section.
ENGINE
The
airplane
is
powered
by
a
horizontally-opposed,
four-cylinder,
over-
head-valve,
air-cooled,
carbureted
engine
with
a
wet
sump
oil
system.
The
engine
is
a
Lycoming
Model
O-235-N2C
and
is
rated
at
108
horsepower
at
2550
RPM.
Major
engine
accessories
(mounted
on
the
front
of
the
engine)
include
a
starter,
a
belt-driven
alternator,
and
an
oil
cooler.
Dual
magnetos
are
mounted
on
an
accessory
drive
pad
on
the
rear
of
the
engine.
Provi-
sions
are
also
made
for
a
vacuum
pump
and
a
full
flow
oil
filter.
NEW
ENGINE
BREAK-IN
AND
OPERATION
The
engine
underwent
a
run-in
at
the
factory
and
is
ready
for
the
full
range
of
use.
It
is,
however,
suggested
that
cruising
be
accomplished
at
75%
power
as
much
as
practicable
until
a
total
of
50
hours
has
accumu-
lated
or
oil
consumption
has
stabilized.
This
will
ensure
proper
seating
of
the
rings.
If,
during
the
first
25
hours,
oil
must
be
added,
use
only
aviation
grade
straight
mineral
oil
conforming
to
Specification
No.
MIL-L-6082.
COOLING
SYSTEM
Ram
air
for
engine
cooling
enters
through
two
intake
openings
in
the
front
of
the
engine
cowling.
The
cooling
air
is
directed
around
the
cylin-
ders
and
other
areas
of
the
engine
by
baffling,
and
is
then
exhausted
through
an
opening
at
the
bottom
aft
edge
of
the
cowling.
No
manual
cool-
ing
system
control
is
provided
..
A
winterization
kit
is
available
for
the
airplane.
The
kit
consists
of
cover
plates
to
partially
cover
the
cowl
nose
cap
opening
(and
the
oil
cooler
on
those
airplanes
with
an
O-235-N2C
engine),
placards
to
be
installed
on
the
cover
plates,
insulation
for
the
engine
crankcase
breather
line,
and
a
placard
to
be
installed
on
the
map
compartment
door.
This
equipment
1
July
1978
Revision
1 -
31
March
1983
21