Lycoming TEO-540-C1A Maintenance Manual page 179

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Crankshaft Inspection Checklist for TEO-540-C1A Engines (Cont.)
Item
Counterweight Inspection (Cont.)
Examine the lug bushings
(Figure 28) for roundness
and for any scratches,
etching, galling or any other
surface damage.
Complete Non-Destructive
Testing (magnetic particle
inspection) on the
counterweights.
Examine the bushing bore on
the counterweight for
roundness and for any
scratches, etching, galling or
any other surface damage.
Measure the bushing bore
diameter on the
counterweight.
(a) The bushing bore on the counterweight must be between
0.9369 and 0.9377 in. (23.7973 and 23.8176 mm).
NOTICE: If the bushing bore on the counterweight is not within the specified tolerances, replace
the counterweight. Some counterweights must be replaced as a matched set.*
CAUTION
Examine the surface of the
rollers for scoring,
scratches, punch marks, or
any other surface damage.
Make sure the roller surface
is smooth.
*Refer to the latest revision of Service Instruction Nos. SI-1012 and SI-1535 for part numbers and
instructions to replace counterweights and rollers.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Comments
Replace any lug bushing that
is out-of-round, scratched,
etched, galled, or has surface
damage. Refer to the latest
revision of Service
Instruction No. SI-1142
Refer to Chapter 05-50.
Replace the counterweight if
the bushing bore on the
counterweight is not round,
not smooth, is out of
tolerance, or has surface
damage.*
DO NOT INCREASE THE DIAMETER OF THE BUSHING BORE ON A
COUNTERWEIGHT. THIS ENLARGEMENT CAN CAUSE ENGINE
DAMAGE BECAUSE IT WILL DECREASE THE SNAP RING GROOVE
DEPTH IN THE BUSHING BORE ON THE COUNTERWEIGHT.
If the roller surface is not
smooth or has scoring,
scratches, punch marks, or
any other surface damage is
on one or both rollers in a
pair, replace the rollers as a
matched pair.
Findings/
Corrective Action
Findings / Comments:
Outcome of Bushing Bore
Inspection for Counterweight
Position 1
Accept Replace
Outcome of Bushing Bore
Inspection for Counterweight
Position 2
Accept Replace
Bushing Bore Diameter
Counterweight Position 1:
Bushing Bore Diameter
Counterweight Position 2:
Outcome of Roller Pair
Inspection for Counterweight
Position 1
Accept Replace
Outcome of Roller Pair
Inspection for Counterweight
Position 2
Accept Replace
Done
72-20
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