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General| Bore | 4.375 in (111.1 mm) |
|---|---|
| Stroke | 3.875 in (98.4 mm) |
| Compression Ratio | 8.5:1 |
| Fuel Type | Avgas 100LL |
| Fuel system | Carburetor |
| Cooling system | Air-cooled |
| Type | Four-cylinder, horizontally opposed |
| Displacement | 3.85 L (235 cu in) |
Details the current and previous revision information for the manual.
Manual is intended for owners, pilots, and maintenance personnel.
Highlights critical safety warnings regarding engine operation and limitations.
Advises users to stay updated with service bulletins and letters.
Clarifies that illustrations are typical, not specific examples.
Provides a general description of the engine type and configuration.
Details key components like cylinders, crankshaft, and crankcase.
Describes lubrication, induction, and ignition systems.
Covers specifications for various O-235 models.
Details specifications for O-290 models.
Information on accessory drives and alternate power ratings.
Lists the weight of different engine models.
Covers engine starting, warm-up, and pre-takeoff checks.
Details flight operations, mixture control, and leaning procedures.
Discusses carburetor heat use and critical operating parameters.
Includes performance curves and engine shutdown procedure.
Details daily pre-flight and pre-starting checks.
Covers inspections at 25, 50, 100, and 400-hour intervals.
Information on service bulletins and instructions.
Procedures for ignition harness, wiring, and magneto timing.
Covers fuel leaks, screens, grades, and idle adjustments.
Details oil systems, sump capacity, and cylinder maintenance.
Instructions for checking generator drive belt tension.
Addresses issues related to engine starting and idling.
Covers low power, uneven running, and full power issues.
Troubleshooting low oil pressure and high oil temperature.
Addresses oil consumption, cold weather, and engine stopping problems.
Procedures for preparing an engine for installation.
Preparing carburetors and preventing engine corrosion.
Provides visual aids and important notes for installation.
Contains temperature, fraction conversions, and inspection forms.
Includes full throttle HP at altitude and speed equivalents.
