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Oil Grade at Temperatures between 30°F to 90°F (-1°C
to 32°C)
Oil Grade at Temperatures between 0°F to 70°F (-18°C
to 21°C)
Oil Grade at Temperatures below 10ºF (-12ºC)
The correct grade of oil to be used is based on environmental conditions.
If the aircraft is going to be flown into an area that is much warmer or colder than the aircraft is
usually operated in, use a different viscosity of oil.
During operation, if the oil inlet temperatures are near the maximum permitted temperatures, then a
higher viscosity oil can help to decrease the temperatures.
Fuel minimum octane (Refer to the latest revision of
Service Instruction No. SI-1070 for any new approved
fuels.)
Fuel Injector
Fuel Pump
Starter Drive, Ratio to Crankshaft
and Rotation
Starter - Hartzell Engine Technologies (formerly Kelly
Aerospace) or equivalent
Starter
Alternator Drive, Ratio to Crankshaft
and Rotation
Alternator
Alternators, Dual
Lycoming Electronic Ignition System
Magneto Drive, Ratio to Crankshaft
and Rotation
Tachometer Drive, Ratio to Crankshaft
and Rotation (Optional)
NOTICE: All locations and rotations are as viewed from the anti-propeller end of the engine
unless specified differently.
For any possible additional optional starters and alternators, refer to the latest revision
of Lycoming Service Instruction No. SI-1154.
Appendix A
Page 52
IO-390-D Series Engine Installation and Operation Manual
Table A-1 (Cont.)
IO-390-D Series Engine Specifications
40
30
20
100 or 100LL (Aviation Grade)
LFR-NNSM10
Diaphragm
16.556:1
Counterclockwise
12 Volt - (Optional)
24 Volt - (Optional)
Refer to the latest revision of Service
Instruction No. 1154 or the applicable
parts catalog for approved starters.
3.20:1 – Clockwise
3.70:1 – Clockwise (Optional)
Refer to the latest revision of Service
Instruction No. 1154 or the applicable
parts catalog for approved alternators.
Optional
66K4A3SN-04 (Left)
66K4A3SN-04 (Right)
1.000:1
Clockwise
0.5:1
Clockwise
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40
30, 40 or 20W-40
30 or 20W-30
March 2020
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