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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
10. Oil Suction Screen Removal/Installation
Remove the suction screen from the oil sump.
A.
Discard the gasket.
B.
Before you clean the suction screen, examine the suction screen for metal particles, shavings
C.
or flakes. Refer to "Oil Filter/Suction Screen Inspection" procedure in this chapter.
Clean the suction screen.
D.
Install the suction screen with a new crush type gasket.
E.
11. Oil Filter/Oil Suction Screen Inspection
Cut open the removed oil filter canister with an approved tool (e.g., for full-flow filters, use
A.
Champion Tool CT-470) per the tool manufacturer's instructions.
Remove the paper element from the oil filter.
B.
Carefully cut the paper element at each end of the body.
C.
Carefully unfold the paper element to prevent loss of collected particles which can
D.
compromise the integrity of this inspection.
Examine the material trapped in the filter. Look for shiny metallic particles/residue, shavings
E.
or flakes. Refer to the sections: "Identification of Metallic Solids After Oil Servicing" and
"Visual Inspection of the Oil Filter Element and Oil Suction Screen" in this chapter.
Record all inspection findings and any corrective action in the engine logbook.
F.
12. Identification of Metallic Solids After Oil Servicing
A. Metallic particles in the oil will require further examination since the metallic particles can be
an early indication of wear or damage to engine components such as cylinders, bushings,
piston pins, etc. ("Metallic particles" herein include metal particulates and/or chips, flake,
hair-like strands, shavings, etc.)
B. Identification of the nature of the metallic particles found in an oil filter element or oil
suction screen during an oil change is helpful as a diagnostic method.
C. Identification of the metallic particles is a progressive approach that begins with a "Visual
Inspection of the Oil Filter Element and Oil Suction Screen" in this chapter that can be
followed with basic chemical analysis or more in-depth analysis (such as spectrometric oil
analysis or directly with component examination and subsequent corrective action.
D. Through spectrometric oil analysis for metal content, the metallic concentrations can be
identified and corrective action taken. Refer to the latest revision of Service Letter No. L171
for additional details.
NOTICE: For spectrometric oil analysis to be an effective diagnostic tool, Lycoming Engines
recommends that oil samples must be taken and analyzed at each oil change.
Contact Lycoming Engines' Technical Support at the phone numbers at the front of this manual,
if:
• The cause of the metal contamination cannot be found
• If the next two oil analyses show progressive increases in aluminum or iron content,
complete a "Visual Cylinder Inspection," and/or "Cylinder Borescope Inspection" on each
engine cylinder per Chapter 72-30.
© 2021 Avco Corporation. All Rights Reserved
February 2021
12-10
Page 65
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