O-300-A, C & D Type Certificate E-253 ENGINE SPECIFICATIONS ....................
O-300-A, C & D
Cylinders
OIL FILLER
LIFTING EYE
ACCESSORY CASE
Arrangement ....................................................................... Horizontally Opposed
CRANKSHAFT
& PROPELLER
SPARK PLUGS OIL GAUGE
ROD
Number of Cylinders........................................................................................... 6
FLANGE
Compression Ratio........................................................................................7.0:1
Firing Order......................................................................................... 1-6-3-2-5-4
STARTER
MOTOR &
Bore (Inches) .................................................................................................4.06
SOLENOID Stroke (Inches)...............................................................................................3.88
Piston Displacement (cu. in.) ...........................................................................301
MAGNETO Brake Horsepower
Rated Maximum Continuous Operation..............................145 BHP @ 2700 RPM
CYLINDERS
OPERATING LIMITS
Crankshaft Speed - RPM
Rated Maximum Continuous Operation..........................................................2700
Idle .................................................................................................. Not Available
GENERATOR
OR ALTERNATOR
ENGINE MOUNTS
Manifold Pressure Limit (In. Hg.) Absolute ........................................................... Full Throttle
REMOVEABLE
OIL SUCTION
SCREEN
Fuel Control System ............................................................................. Carburetor MS 3SPA
Fuel ............................................................................................................ 80/87 Min.
OIL DRAIN
INDUCTION SYSTEM
OIL SUMP Oil
INTAKE
OIL SUMP TEMPERATURE AVIATION GRADE SAE GRADE MULTI-VISCOSITY
CARBURETOR
BELOW 40 65 30 10W-30 / 15W-50 / 20W-50
The O-300-A, C & D models are six cylinder, carbureted engines
ABOVE 40 80 50 15W-50 / 20W-50 / 20W-60
producing 145 brake horsepower and have a crankshaft speed of 2700 RPM.
The engine has horizontally opposed air cooled cylinders. The engine Oil Pressure
cylinders have an overhead valve design. The cylinders have updraft intake Idle, Minimum, psi .............................................................................................. 5
inlets and downdraft exhaust outlets mounted on the bottom of the cylinder Normal Operation, psi...................................................................................30-60
head. Oil Sump Capacity (U.S. Quarts) ......................................................................................... 8
The O-300-A, C & D engines have a 301 cubic inch displacement Max. Oil Consumption (Lb./BHP/Hr. Max.) .................................................. .006 X % Power
............................................................................................................ 100
achieved by using a cylinder design with a 4.06 inch diameter bore and a 3.88
inch stroke. The dry weight of the engine is 248.70 lbs. without accessories.
The weight of the engine with installed accessories is approximately 300 lbs. Oil Temperature Limits
Minimum for Take-Off...................................................................................75° F
The O-300-C is identical to the O-300-A except for propeller flange Maximum Allowable ...................................................................................225° F
provisions. O-300-D is similar to O-300-C except for Continental right angle Cylinder Head Temperature
automatic engagement starter drive which incorporates a vacuum pump drive.
Recommended Max. at Cruise....................................................................420° F
OVERALL ENGINE DIMENSIONS INCHES Limit...........................................................................................................525° F
Ignition Timing (Compression Stroke, Breaker Opens)
HEIGHT 27.41 Right Magneto, Degrees BTC ........................................................................... 26
WIDTH 31.50 Left Magneto, Degrees BTC ............................................................................. 28
Spark Plug
LENGTH 35.97 TCM .........................................................................................................627643
Champion .............................................................................................. REM40E
CONTINENTAL MOTORS
