TEXTRON LYCOMING OPERATOR'S MANUAL
SECTION
1 0-360
and ASSOCIATED MODELS
Valve Operating Mechanism
- A conventional type camshaft
is located
above and parallel
to the crankshaft. The camshaft
actuates hydraulic
tappets which operate
the valves through push rods and
valve rockers. The
valve rockers
are supported on full floating
steel shafts. The valve springs
bear against hardened
steel seats and are retained
on the valve stems by
means
of
split keys.
Crankcase - The crankcase assembly consists of two reinforced aluminum
alloy
castings, fastened together
by means of studs, bolts and nuts.
The
mating surfaces
of the two castings are joined
without the use of a gasket,
and the main bearing bores are machined for use of precision type main
bearing
inserts.
Crankshaft - The
crankshaft is made from a chrome
nickel molybdenum
steel
forging. All bearing
journal surfaces are nitrided.
Connecting Rods
- The connecting rods are
made in the form of "H"
sections
from alloy steel forgings.
They have replaceable bearing
inserts in
the
crankshaft ends and bronze bushings
in the piston ends. The
bearing
caps on the crankshaft
ends are retained by two bolts
and nuts through
each cap.
Pistons - The pistons
are machined from an aluminum
alloy. The piston
pin is
of a full floating
type with
a plug located
in each end of
the pin.
Depending
on the cylinder
assembly, pistons
may be
machined for either
three
or four rings
and may
employ
either half
wedge or
full wedge
rings.
Consult the
latest revision
of Service Instruction
No.
1037 for proper
piston
and ring combinations.
Accessory
Housing
- The accessory
housing is made
from an aluminum
casting
and is fastened
to the rear of the
crankcase and
the top rear of
the
sump. It forms
a housing for the oil pump
and the various accessory drives.
Oil Sump (Except
-AIO Series)
- The sump incorporates
an
oil drain plug,
oil suction
screen, mounting
pad for carburetor
or fuel
injector, the intake
riser
and intake
pipe connections.
Crankcase
Covers (-A10
Series) - Crankcase
covers
are employed
on the
top and bottom
of the engine. These covers
incorporate oil suction
screens, oil
scavenge line
connections.
The top cover
incorporates
a
connection
for a breather
line and
the lower cover
a connection for
an oil
suction
line.
1-2
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