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4. Oil Line Replacement
Disconnect, drain, and discard the oil line.
A.
CAUTION
Install a new oil line; do not let the oil line touch a heat source.
B.
CAUTION
Torque the fitting connections on the oil line ends in accordance with the torque values in the
C.
Standard Torque Tables in the latest revision of the Service Table of Limits - SSP-1776 and
aircraft manufacturer's instructions.
5. Oil Level Gage Tube and Assembly Removal
Remove and discard the safety wire/cable (Figure 2) from the oil level gage tube.
A.
Carefully turn the oil level gage tube (Figure 3) to remove the oil level gage assembly and
B.
tube as a unit (with the dipstick and O-ring) from the engine. Discard the oil level gage
gasket and oil level gage plug ring.
Put the oil level gage assembly on a clean surface in a safe place to prevent damage to the
C.
components.
Figure 2
Safety Wire on the Oil Level Gage
6. Oil Level Gage Tube and Assembly Installation
NOTICE: Refer to the applicable parts catalog for the correct oil level gage assembly and oil level
gage tube for your IO-390-D engine model.
Install a new oil level gage gasket on the threads of the top of the oil level gage tube (Figure 3).
A.
Apply Food-Grade Anti-Seize to the threads of the oil level gage tube and oil level gage plug
B.
ring.
Install the oil level gage tube on the engine.
C.
Safety wire/cable the oil level gage tube as shown in Figure 2. Refer to the latest revision of
D.
Service Instruction No. SI-1566.
Install a new oil level gauge plug ring on the threads of the oil level gage assembly (Figure 3).
E.
Apply Food-Grade Anti-Seize to the threads at the top and bottom of the oil level gage tube.
F.
Install the oil level gage assembly (with the dipstick and new plug ring) in the oil level gage
G.
tube securely.
72-50
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REPLACE A BRITTLE, CRACKED, KINKED, OR DAMAGED OIL LINE.
MAKE SURE THERE ARE NO SHARP BENDS OR KINKS IN THE OIL
LINE ROUTING TO PREVENT INTERRUPTIONS TO OIL FLOW.
MAKE SURE OIL LINES ARE NOT TOUCHING HEAT SOURCES
THAT COULD DAMAGE THE LINE AND CAUSE OIL LOSS.
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Figure 3
Oil Level Gage
© 2020 Avco Corporation. All Rights Reserved
March 2020
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