Lycoming TEO-540-C1A Maintenance Manual page 261

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Piston Inspection Checklist for TEO-540-C1A Engine Models (Cont.)
NOTICE: Lycoming manufactures pistons with a taper that extends from the top to the bottom of the
skirt with the smaller diameter at the top.
Section Through Piston Showing Points for Measuring Diameter
Inspection Item
Measure the inside diameter of
the piston pin hole (Figure 24).
Measure the piston diameter at
the top ring land of the piston
between the top and second
compression ring grooves (at a
right angle to the piston pin
hole) (Figure 24).
Measure the diameter
approximately 1/8 in. (3.18
mm) above the bottom of the
piston skirt (at a right angle to
the piston pin hole) (Figure 24).
Subtract the diameter approximately 1/8 in. above the bottom of the piston skirt from the Average
Cylinder Diameter (from the Cylinder Assembly Inspection Checklist) and compare to the acceptable
clearance in the latest revision of the Service Table of Limits - SSP-1776.
Piston skirt and cylinder clearance.
Measure the piston ring
clearance.
**Compare the actual measurement against the limits in the latest revision of the Service Table of Limits
- SSP-1776. Replace the piston if any of the measurements are out of tolerance.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Figure 24
Cylinder
1
Actual
Measurement**
SSP-1776
Actual
Measurement**
SSP-1776
Actual
Measurement**
SSP-1776
Actual
Measurement**
SSP-1776
Findings/Corrective Action
Cylinder Cylinder Cylinder
2 3
Cylinder Cylinder
4 5 6
72-30
Page 231