IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
12-10
March 2020
Page 71
IO-390-D Series Engine Maintenance Manual
10.
Oil Suction Screen Removal/Inspection/Cleaning/Installation
NOTICE:
On the IO-390-D (Figure 2) engines there is an oil suction screen in the oil sump.
A.
Remove and discard the safety wire/cable from the oil drain plug and the screen plug on the
oil sump (Figure 2).
B.
Put a suitable collection container with a minimum 15-quart (14-liter) capacity under the
drain plug of the oil sump.
C.
Remove the oil sump drain plug and drain the oil from the engine.
D.
Remove the screen plug and oil suction screen from the oil sump.
E.
Remove and discard the gasket from the screen plug.
F.
Before cleaning the oil suction screen.
(1)
Examine the oil suction screen for distortion, deformation or openings in the mesh and/or
metallic particles, shavings, or flakes (which can be an indication of possible excessive
internal wear on the engine).
(2)
Examine any material trapped in the oil suction screen. Examine the condition of the oil
and particles on the oil suction screen. Look for shining, metallic residue which is an
indication of a high concentration of metal.
NOTICE:
Results from examination of the oil suction screen on the first oil change of a
new, rebuilt or overhauled engine usually will show small metallic particles or
shavings which are acceptable.
(3)
If steel, copper or aluminum particles are found on the oil suction screen, examine the
cylinders and other metal components for wear or damage.
G.
Clean the oil suction screen with mineral spirits or equivalent degreasing solvent.
H.
Apply Food Grade Anti-Seize to the threads of the screen plug and install the oil suction
screen (do not flare the ends of the suction screen), a new gasket, and the screen plug.
I.
Tighten the screen plug until the sealing surfaces are in contact and then tighten the screen
plug an additional 135°.
CAUTION
MAKE SURE THAT THE SCREEN PLUG IS INSTALLED TIGHTLY. IF
THE SCREEN PLUG IS NOT TIGHTLY INSTALLED AND LEAKS,
ENGINE FAILURE CAN OCCUR.
J.
Apply one to two drops of Loctite
®
564
™
or equivalent to the threads of the oil sump drain
plug and install the oil sump drain plug in the oil sump. Torque the drain plug in accordance
with the latest revision of the
Service Table of Limits - SSP-1776.
CAUTION
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.
K.
Safety cable/wire the oil sump drain plug and the screen plug in the oil suction screen in
accordance with the standard practices per the latest revision of AC43.13-1B or the latest
revision of Service Instruction No. SI-1566.
L.
Add oil per the "Add Oil to the Engine" procedure in this chapter.
M.
After all service is complete, operate the engine and look for oil leaks. Identify and correct
the cause of any oil leak.
