Power Plant

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TTP
Cessna 172
Cat.B1
L-3
ATA71
Power Plant
Cat.B2
L-1
Textron Lycoming IO-360-L2A engine is direct drive, four cylinder, fuel injected, horizontally opposed, and air cooled. The cylinders, numbered from front to rear, are staggered to have individual throws on the crankshaft for each connecting rod. The right front cylinder is number 1 and cylinders on the right side of the engine are identified by odd numbers 1 and 3. The left front cylinder is number 2 and the cylinders on the left side are identified as 2 and 4.

 IO-360-L2A Technical Description
172R Rated Horsepower at 2400 RPM 160
172S* Rated Horsepower at 2700 RPM 180
Number of Cylinders 4 
Horizontally Opposed
Displacement 361.0 Cubic Inches
Bore 5.125
Stroke 4.375
Compression Ratio 8.5:1
Firing Order 1-3-2-4
Magnetos:     Right  Slick 4371 (25°BTDC)
                        Left    Slick 4371 (25°BTDC)
Spark Plugs 18MM
Torque: 420 In lbs
Valve Rocker Clearance (hydraulic tappets collapsed)
0.028 to 0.080 inch
Fuel Injector RSA-5AD1
Tachometer Mechanical Drive
Oil Capacity 8.0 Quarts
Oil Pressure.      Min Idling 20 PSI
                             Normal 50 to 90 PSI
                             Maximum 115 PSI
Oil Temperature Normal 100°F to 245°F
Maximum 245°F
Dry Weight - without alternator or vacuum pumps 278
711001 Cowling - Inspect for cracks, dents, other damage and security of fasteners.
A 05-12-01 120
712001 Engine Shock Mounts, Engine Mount Structure, and Ground Straps - Check condition, security, and alignment.
712003 Inspect tubular engine mount.
716001 Alternate Induction Air System - Check for
obstructions, operation, and security.
A 05-12-01 120
716002 Induction System - Check security of
clamps, tubes, and ducting. Inspect for evidence
of leakage.
A 05-12-01 120
Revised
Aug 1/00
716003 Induction Airbox, Valves, Doors, and Controls - Remove air filter and inspect hinges,
doors, seals, and attaching parts for wear and security. Check operation.A 05-12-01 120
716004 Induction Air Filter - Remove and clean. Inspect for damage and service.

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