IO-390-D Series Engine Maintenance Manual
05-20
© 2020 Avco Corporation. All Rights Reserved
Page 18
March 2020
IO-390-D Series Engine Maintenance Manual
25-Hour Engine Inspection Checklist for IO-390-D Series Engines (Cont.)
Inspection Item
Comments
Results/Notes
Done
WARNING
EXAMINE THE OIL PRESSURE SCREEN OR THE FILTER ELEMENT OF
THE OIL FILTER FOR UNWANTED METAL PARTICLES. CLEAN THE
OIL PRESSURE SCREEN. A CLOGGED OIL PRESSURE SCREEN CAN
CAUSE ENGINE FAILURE.
Remove, examine, clean and
install the oil pressure screen (or
replace the oil filter on the initial
oil change).
Refer to the section in Chapter 12-
10: "Oil Pressure Screen
Removal/Inspection/Cleaning/
Installation" or “Oil Filter
Replacement.”
WARNING
EXAMINE THE OIL SUCTION SCREEN FOR UNWANTED METAL
PARTICLES. REMOVE ANY CLOGS OR BLOCKAGES IN THE SUCTION
SCREEN.
Remove, examine and clean the
oil suction screen at the oil sump;
install the oil suction screen.
If blockage is found, record and
identify the blockage (metal,
carbon, etc.)
Remove any blockage and clean
the oil suction screen. Refer to the
section “Oil Suction Screen
Removal/Inspection/Cleaning/
Installation” in Chapter 12-10.
Examine the engine for fuel or
oil leaks.
NOTICE:
During the first
hours of service, engines can
have some leakage at the
cylinder base. This initial leakage
is not harmful or detrimental to
the engine.
Complete the “Oil Leak Check”
procedure in Chapter 12-10.
Examine the engine for dirt,
particulate, sand, or other
contamination.
Remove any dirt, particulate,
sand, or other contamination per
Chapter 5-30.
Re-torque the exhaust flange nuts
after the first 25-hours of engine
operation.
Refer to Chapter 78-00.
