Lycoming TEO-540-C1A Maintenance Manual page 276

E. Identify with a tag and remove the top spark plugs from the engine cylinders per the "Spark
Plug Removal" procedure in Chapter 74-20.
F. Identify the location of each cylinder and valve train component for reference on assembly
and remove the cylinder and valve train components per the "Cylinder Removal" section in
this chapter.
G. Remove the intake and exhaust valves per the "Intake Valve Removal" and "Exhaust Valve
Removal" sections in this chapter.
H. Examine the valve stem keys (Figure 27) for wear. Look for any distinct, uniform patterns.
Replace worn valve stem keys.
NOTICE: Refer to the latest revision of the Service Table of Limits - SSP-1776 for valve
guide dimensions to use the correct reamer.
Use reamer tools to remove hardened carbon from the valve guides.
I. Apply ordinary cup grease on the flutes of the reamer to trap and hold the deposits on the
reamer.
J. Ream the valve guide as follows:
(1) Apply force on the reamer to ensure the reamer has gone through the full length of the
valve guide. The 1 in. (2.54 cm) pilot must be visible through the exhaust port or through
spark plug hole using an angled mirror.
(2) Clean the valve guide per the "Hard Carbon Removal" procedure in Chapter 05-30 for
additional cleaning details.
(3) Measure the inner diameter of the valve guide using the correct plug gage.
(4) Examine the reamed hole to see if the reamer has cut all the way to the exhaust port end
of the guide. If it has not, and the exhaust port end of the hole looks dark, the valve guide
is bell-mouthed and must be replaced.
(5) If the valve is acceptable, apply lubricant to the valve guide.
CAUTION
K. Install the valves that are satisfactory, in the same position where they were. Refer to the
"Intake Valve Installation" and "Exhaust Valve Installation" procedures in this chapter.
L. Install the valve springs and valve spring seats.
M. Remove and clean the hydraulic lifter and remove all oil. Refer to the "Tappet Cleaning"
procedure in Chapter 05-30.
N. Examine the lifter for any malfunction.
O. Clean the inner diameter of the cam follower.
P. Install the hydraulic lifter.
Q. Install the cylinder and valve train components in the same position as removed. Refer to the
"Cylinder Installation" procedure in this chapter.
R. Examine, rotate (as needed), and install serviceable spark plugs per the "Spark Plug
Inspection," "Spark Plug Rotation," and "Spark Plug Installation" procedures in Chapter 74-
20.
72-30
Page 246
NEVER USE THE PISTON TO PUSH THE VALVE THROUGH THE
GUIDE.
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
November 2018