TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
72-20
November 2018
Page 161
TEO-540-C1A Engine Maintenance Manual
Tappet Inspection Checklist for TEO-540-C1A Engine Models (Cont.)
Task
Corrective Action
Findings
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.
Rockwell
marks
alone are not sufficient cause
to replace a tappet body.
If spalling or pitting is found:
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.
Tappet body
acceptable
Replace
tappet body
New camshaft
Replaced all
tappet bodies
NOTICE:
If a new camshaft is installed in the engine, replace all of the tappet
bodies.
New camshaft
Replaced all
tappet bodies
Figure 41
Spalling on Tappet Face
Figure 42
Rockwell Marking on Tappet Face
Look
for
discoloration,
with
circular wear and/or wavy patterns
on the face of the tappet body
(Figure 43).
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.
Circular wear
Wavy pattern(s)
Discoloration
Replace tappet
body
Figure 43
Unacceptable Surfaces
* Refer to the latest revision of Service Instruction No. SI-1011 for part numbers.
