Lycoming TEO-540-C1A Maintenance Manual page 271

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
I. Push Rod Installation
(1) Turn the crankshaft to position the piston at top dead center of the compression stroke on
the applicable cylinder to ensure that the valves are closed.
(2) Use a brush and apply a mixture of 15% STP or equivalent and 85% SAE No. 50
mineral-based aviation-grade lubricating oil to 1 inch of both ends of the push rods. Refer
to the latest revision of Service Instruction No. SI-1059 for any new details.
(3) Install the push rods into the full length of the shroud tube.
(4) Press the push rods tightly from the outer end of the shroud tube to test the spring tension
and free travel of the unloaded or dry hydraulic tappet plungers. Make sure the springs
compress and return.
J. Install the valve stem cap over the exhaust valve stem (Figure 27).
CAUTION
K. Install the rockers with the cupped end on the push rod (Figure 18).
L. Align each valve rocker assembly with the rocker shaft.
M. Slide the valve rocker shafts through each valve rocker assembly and washer to seat the valve
rocker in place for both the intake and exhaust valves.
N. Make sure the valve rocker assemblies are in the correct position on the intake and exhaust
valves.
CAUTION
NOTICE: If the clearance between the valve rocker and the cylinder head cannot be brought
within the Service Table of Limits - SSP-1776 install the standard valve rocker
thrust washer per the latest revision of Service Bulletin No. SB 225 for replacement
valve rocker thrust washers.
O. Measure the clearance between the valve rocker and cylinder head. Refer to the latest
revision of the Service Table of Limits - SSP-1776.
NOTICE: The procedure to measure dry tappet clearance is the same for intake or exhaust
valves.
© 2018 Avco Corporation. All Rights Reserved
November 2018
SOME LYCOMING ENGINES USE A DIFFERENT ROCKER ARM FOR
EACH INTAKE AND EXHAUST VALVE. MAKE SURE THE INTAKE
VALVE ROCKER ASSEMBLIES ARE INSTALLED ON THE INTAKE
SIDE OF THE CYLINDER. MAKE SURE THE EXHAUST VALVE
ROCKER ASSEMBLY IS INSTALLED ON THE EXHAUST VALVE SIDE
OF THE CYLINDER.
BE SURE THERE IS NO OIL INSIDE THE TAPPET BODIES AND THAT
THE TAPPET PLUNGER AND CYLINDER ASSEMBLY ARE
THOROUGHLY CLEAN AND DRY. WASH ANY LUBRICATING OR
PRESERVATIVE OIL (MINERAL SPIRITS, STODDARD SOLUTION, OR
EQUIVALENT) FROM THESE PARTS PER THE "TAPPET CLEANING"
SECTION IN CHAPTER 05-30, SINCE TAPPET ASSEMBLIES MUST BE
ABSOLUTELY DRY FOR THE TAPPET CLEARANCE CHECK.
72-30
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