Lycoming TEO-540-C1A Maintenance Manual page 124

Problem
Excessive oil
consumption
12-30
Page 94
Table 1 (Cont.)
Fault Isolation Guide
Cause
New piston rings are not
completely seated (break-
in not done)
Piston rings are worn or
incorrectly installed
OR
Cylinder barrels are
glazed or worn too much
Worn valve guides
Oil leaks
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Corrective Action
As part of break-in, operate the
engine at not less than 65%
power for the first 50 hours to
seat new piston rings.
1. Complete the "Cylinder
Compression Check
Procedure."
2. Complete the "Cylinder
Borescope Inspection"
procedure to determine if
further corrective action is
necessary
NOTICE: Listen for a hissing
sound at the breather entrance
of the crankcase which is an
indication of air leaks around
the rings.
3. Remove the cylinders, replace
the piston rings, deglaze the
cylinder barrels, and re-install
the cylinders as per the
following sections:
• Cylinder Removal
• Piston Removal
• Piston Inspection
• Piston Ring Replacement
• Barrel Glaze and Varnish
Removal from Interior
Cylinder Barrel
• Piston Installation
• Cylinder Installation
1. Measure the valve guides for
wear as per instructions in
the section "Exhaust Valve
and Guide Inspection."
2. Replace worn valve guides.
Examine the external area of
the engine for leaks, identify
and correct the cause of any
leak.
© 2018 Avco Corporation. All Rights Reserved
Ref.
IOM
72-30
72-30
72-30
November 2018