LYCOMING OPERATOR’S MANUAL SECTION 3
O-360 AND ASSOCIATED MODELS OPERATING INSTRUCTIONS
SECTION 3
OPERATING INSTRUCTIONS
1. GENERAL. Close adherence to these instructions will greatly contribute to long life, economy and
satisfactory operation of the engine.
NOTE
YOUR ATTENTION IS DIRECTED TO THE WARRANTIES THAT APPEAR IN THE
FRONT OF THIS MANUAL REGARDING ENGINE SPEED, THE USE OF SPECIFIED
FUELS AND LUBRICANTS, REPAIR AND ALTERATIONS. PERHAPS NO OTHER ITEM
OF ENGINE OPERATION AND MAINTENANCE CONTRIBUTES QUITE SO MUCH TO
SATISFACTORY PERFORMANCE AND LONG LIFE AS THE CONSTANT USE OF
CORRECT GRADES OF FUEL AND OIL, CORRECT ENGINE TIMING, AND FLYING
THE AIRCRAFT AT ALL TIMES WITHIN THE SPEED AND POWER RANGE SPECIFIED
FOR THE ENGINE. DO NOT FORGET THAT VIOLATION OF THE OPERATION AND
MAINTENANCE SPECIFICATIONS FOR YOUR ENGINE WILL NOT ONLY VOID YOUR
WARRANTY BUT WILL SHORTEN THE LIFE OF YOUR ENGINE AFTER ITS WARRANTY
PERIOD HAS PASSED.
New engines have been carefully run-in by Lycoming and therefore, no further break-in is necessary
insofar as operation is concerned; however, new or newly overhauled engines should be operated on straight
mineral oil for a minimum of 50 hours or until oil consumption has stabilized. After this period, a change to
an approved additive oil may be made, if so desired.
NOTE
Cruising should be done at 65% to 75% power until a total of 50 hours has accumulated or
oil consumption has stabilized. This is to ensure proper seating of the rings and is applicable
to new engines, and engines in service following cylinder replacement or top overhaul of one
or more cylinders.
The minimum fuel octane rating is listed in the flight chart, Part 8 of this section. Under no circumstances
should fuel of a lower octane rating or automotive fuel (regardless of octane rating) be used.
2. PRESTARTING ITEMS OF MAINTENANCE. Before starting the aircraft engine for the first flight of the
day, there are several items of maintenance inspection that should be performed. These are described in
Section 4 under Daily Pre-Flight Inspection. They must be observed before the engine is started.
3. STARTING PROCEDURES. O-360, HO-360, IO-360, AIO-360, HIO-360, TIO-360 Series.
The following starting procedures are recommended, however, the starting characteristics of various
installations will necessitate some variation from these procedures.
a. Engines Equipped with Float Type Carburetors.
(1) Perform pre-flight inspection.
3-1
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