Lycoming TEO-540-C1A Maintenance Manual page 187

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Connecting Rod Inspection Checklist for TEO-540-C1A Engines (Cont.)
Connecting Rod Bearing and Crankshaft Clearance
To complete this inspection:
NOTICE: For this inspection, the connecting rods, bearings, connecting rod bolts, and nuts (Figure 33)
are assembled, but not installed on the crankshaft.
All of the connecting rods installed on the crankshaft must be of the same weight class, except
"S" weight rods (service rods) can be used with either "A" or "E" weight rods depending on
parts availability. Record the weight code of each connecting rod in this checklist.
(1) Assemble and torque each connecting rod with new bearings per instructions in the "Connecting Rod
Installation" section in this chapter.
(2) Measure the inside diameter of the bearing in each connecting rod and record the measurement in this
checklist.
(3) Measure the crankshaft diameter at the crank pin journal for each connecting rod and record the
measurement in this checklist.
(4) Subtract the crankshaft diameter at the crank pin journal from the inside diameter of the bearings for
each connecting rod to calculate the connecting rod bearing and crankshaft clearance. Record the
measurement in this checklist.
(5) Compare the connecting rod bearing and crankshaft clearance to the acceptable clearance measurement
in the latest revision of the Service Table of Limits - SSP-1776.
(6) Remove and discard the connecting rod bolts and nuts from the connecting rod assembly.
(7) If the connecting rod bearing and crankshaft clearance is within limits, the connecting rod bearings are
acceptable.
(8) If the connecting rod bearing and crankshaft clearance is not within limits, replace the connecting rod
bearings with oversize bearings to bring the clearance within acceptable limits.
Connecting Rod Inspection Checklist for TEO-540-C1A Engines (Cont.)
Connecting
Connecting Rod Rod Weight
Connecting Rod 1
Connecting Rod 2
Connecting Rod 3
Connecting Rod 4
Connecting Rod 5
Connecting Rod 6
© 2018 Avco Corporation. All Rights Reserved
November 2018
Inside
Diameter of
Code the Bearings
Crankshaft
Diameter at the
Crank Pin Journal Crankshaft Clearance
Connecting Rod
Bearing and
Acceptable
Acceptable
Acceptable
Acceptable
Acceptable
Acceptable
Page 157
Outcome
Replace
Replace
Replace
Replace
Replace
Replace
72-20