Lycoming YO-233-B2A - Page 36

TEO-540-A1A Engine Maintenance Manual
05-20 © 2021 Avco Corporation. All Rights Reserved
Page 16 February 2021
YO-233-B2A Engine Maintenance Manual
25-Hour Initial and Routine Engine Inspection Checklist (Cont.)
Inspection Item
Comments
Results/Notes
Done
Calculate oil consumption.
Refer to the section “Oil
Consumption” in Chapter 12-
10.
If oil consumption has
increased, complete the
“Cylinder Borescope Inspection
Procedure.” Refer to Chapter
72-30.
Complete this 25-hour
Inspection again until oil
consumption stabilizes.
Change the oil.
Refer to the section “Oil
Change Procedure” in Chapter
12-10.
Replace the oil filter.
Refer to the section “Oil Filter
Replacement” in Chapter 12-10.
Examine the oil sump suction
screen and oil filter for
blockage.
Remove any blockage and clean
the oil sump suction screen.
Identify the cause of any
blockage and correct the
problem. Refer to the sections
“Oil Suction Screen
Removal/Installation” and “Oil
Filter/Oil Suction Screen
Inspection” in Chapter 12-10.
EXAMINE THE OIL SUMP SUCTION SCREEN AND OIL FILTER
ELEMENT FOR UNWANTED METAL PARTICLES. A CLOGGED OIL
FILTER AND/OR SUCTION SCREEN CAN CAUSE ENGINE FAILURE.
CORRECT ALL LEAKS. IF FUEL OR OIL LEAKS ARE NOT
CORRECTED BEFORE FLIGHT, THE ENGINE CAN HAVE LOSS OF
POWER OR ENGINE FAILURE CAN OCCUR.
NOTICE: During the first hours of service, engines can have some leakage at the cylinder
head. This initial leakage is not harmful or detrimental to the engine.
Examine the engine and
nacelle for fuel or oil leaks.
Refer to the section “Oil Leak
Check” in Chapter 12-10. If a
leak is found, identify and
correct the cause of the leak.