Lycoming TEO-540-C1A Maintenance Manual page 191

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Tappet Inspection Checklist for TEO-540-C1A Engine Models (Cont.)
Task
Use a 10 power or greater magnifier to
examine the face of the tappet body for
signs of spalling or pitting (Figure 41).
NOTICE: The tappet face also could
have one or more Rockwell
marks (Figure 42). Rockwell
marks look round; whereas a
spall mark has an irregular
pattern.
alone are not sufficient cause
to replace a tappet body.
NOTICE: If a new camshaft is installed in the engine, replace all of the tappet
bodies.
Figure 41
Spalling on Tappet Face
Look for discoloration,
circular wear and/or wavy patterns
on the face of the tappet body
(Figure 43).
* Refer to the latest revision of Service Instruction No. SI-1011 for part numbers.
© 2018 Avco Corporation. All Rights Reserved
November 2018
If spalling or pitting is found:
Rockwell marks
with If circular wear and/or wavy patterns are
found, discard the tappet body and replace
it with a new tappet body.*
Discoloration, without wavy or circular
wear patterns on the tappet face, is not
sufficient reason to replace the tappet.
Unacceptable Surfaces
Corrective Action
A. Remove and discard the tappet
body and replace with a new
tappet body.*
B. Visually examine the camshaft
lobe for any surface irregularity,
scuffing, pitting, or feathering at
the edge of the lobe. If any of
these conditions are found on
the camshaft lobe, replace the
camshaft.
Rockwell Marking on Tappet Face
Figure 43
Findings
Tappet body
acceptable
Replace
tappet body
New camshaft
Replaced all
tappet bodies
New camshaft
Replaced all
tappet bodies
Figure 42
Circular wear
Wavy pattern(s)
Discoloration
Replace tappet
body
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