LYCOMING OPERATOR’S MANUAL
SECTION 3
O-235 AND O-290 SERIES
OPERATING INSTRUCTIONS
OPERATING CONDITIONS
Oil Pressure, psi –
Model
Maximum
Minimum
Idling
Start and Warm-Up
O-235 –C, -E, -F, -G, -H2C, -J,
-K, -M
90
60
25
100
O-235-B
90
60
15
100
O-235-L*, -N
90
60
15
115
O-235-P
90
55
15
115
O-290-D
85
60
25
O-290-D2
90
60
25
100
* - Front of engine
90
50
15
Fuel Pressure, psi –
Model
Maximum
Desired
Minimum
All O-235 models, O-290-D2
8
3
0.5
O-290-D
5
3
0.5
Average Ambient Air
Oil Inlet Temperature
Temperature
Desired
Maximum
Above 60°F (15.5°C)
180°F (82°C)
245°F (118°C)
30°F (-1.11°C) to 90°F (32.2°C)
180°F (82°C)
245°F (118°C)
0°F (-17.8°C) to 70°F (21.1°C)
170°F (77°C)
245°F (118°C)
Below 10°F (-12.2°C)
160°F (71°C)
245°F (118°C)
Engine oil temperatures should not be below 140°F (60°C) during continuous operation.
O-235-C, -E
Operation
RPM
HP
Fuel
Cons.
Gal./Hr.
Max.
Oil Cons.
Qts./Hr.
*Max.
Cyl. Head
Temp.
Normal Rated
2800
115
10.7
0.52
500°F (260°C)
Performance Cruise
(75% Rated)
2350
86
7.3
0.29
500°F (260°C)
Economy Cruise
(65% Rated)
2250
75
5.8
0.25
500°F (260°C)
* - At Bayonet Location – For maximum service life of the engine, maintain cylinder head temperatures
between 150°F (65°C) and 400°F (204°C) during continuous operation.
3-7
Summary of Contents for O-235 series
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