Engine Pre-Oil Procedure - Lycoming IO-390-D Series Maintenance Manual

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
CAUTION
C. Send the oil sample in the vial to the same laboratory (that has been used in the past) for
spectrographical analysis to compare past results and identify a wear trend pattern. Refer to
the latest revision of Service Letter L171 for spectrographic oil analysis.
D. If the engine has an oil pressure screen, complete the "Oil Pressure Screen Removal/
Inspection/Cleaning/ Installation" procedure in this chapter.
If the engine is equipped with an oil filter, complete the "Oil Filter Replacement" procedure
in this chapter during the oil change.
E. Complete the "Oil Suction Screen Removal/Inspection/Cleaning/Installation" procedure in
this chapter.
F. Add oil of the correct viscosity for ambient temperature to the engine. Refer to the "Add Oil
to the Engine" procedure in this chapter.
G. If an oil line has been disconnected or if the oil cooler was drained or replaced or after any
prolonged period of engine inactivity, complete the "Engine Pre-Oil Procedure" in this
chapter.
NOTICE: If an oil hose has been disconnected or if the oil cooler was drained or replaced or
after any prolonged period of engine inactivity complete the "Engine Pre-Oil
Procedure" in section 9 of this chapter.
H. Complete the "Oil Level Check" procedure in this chapter.
I. Safety cable/wire the oil sump drain plug, suction screen plug, and oil filter (if applicable) in
accordance with the standard practices per the latest revision of AC43.13-1B or the latest
revision of Service Instruction No. SI-1566.
J. Dispose of the oil in the collection container in accordance with environmental safety laws.
K. Clean up any oil spilled on the engine.
L. After all service is complete, refer to the Pilot's Operating Handbook (POH) to start the
engine, complete the pre-flight run-up, stop the engine, and look for leaks in the oil system.
Identify and correct the cause of any oil leak.

9. Engine Pre-Oil Procedure

Refer to the latest revision of Service Instruction No. SI-1241 for additional details.
Complete the engine pre-oil procedure on the engine at the following times:
• Before the initial start of an engine after engine installation
• After oil cooler replacement or draining
• After disconnecting any oil lines from the oil cooler circuit.
• After any prolonged period of inactivity requiring a preservation procedure per the latest
revision of Service Letter No. L180
© 2020 Avco Corporation. All Rights Reserved
March 2020
MAKE SURE THAT THE OIL SUMP DRAIN PLUG IS INSTALLED
TIGHTLY. IF THE DRAIN PLUG IS NOT TIGHTLY INSTALLED AND
LEAKS, ENGINE FAILURE CAN OCCUR.
OR
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