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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
(43) Install the valve stem cap (Figure 10) on the exhaust valve
stem.
(44) Install the exhaust rocker assembly (Figure 5).
(45) Push the valve rocker shaft through the exhaust valve rocker
assembly (Figure 5) and install the thrust button on the
exhaust side of the valve rocker shaft.
(46) Complete a dry tappet clearance check per the "Push Rod
Installation" section in this chapter.
(47) Install the screws, rocker box cover with a new gasket on the
cylinder head (Figure 1). Torque the screws per the Special
Torque Requirements Table in the latest revision of the
Service Table of Limits - SSP-1776.
(48) Repeat this exhaust valve and guide inspection for all cylinders, beginning with step (3)
through this step.
(49) Enable power to the engine.
(50) Complete the "Operational Ground Check" in Chapter 72-00
(51) Record all of the results in the 1000-Hour Inspection Checklist for YO-233-B2A Engines
in Chapter 05-20.
7. Cylinder Removal
A. Disable all power to the engine and disconnect the engine wiring harness from the airframe.
B. If not already done:
• Remove airframe components to
enable cylinder removal
• Drain the oil from the oil sump.
• Disconnect the ignition leads to the
spark plugs. Remove the top and
bottom spark plugs from the cylinder.
• Remove the clamps that attach the
primer line to the intake pipe,
disconnect the primer line from the
primer nipple assembly (Figure 11),
put a cap on the end of the primer
line and the primer nipple assembly.
• Remove the intake and exhaust pipes
from the cylinder to be removed.
© 2021 Avco Corporation. All Rights Reserved
February 2021
Airframe Maintenance Manual
"Oil Change Procedure" in Chapter 12-10
"Spark Plug Removal" procedure in Chapter 74-20.
Figure 11
Spark Plugs, Intake Pipes, and Primer Lines
"Intake Pipe Removal" procedure in Chapter 72-80
and the airframe manufacturer's instructions.
Figure 10
Exhaust Valve Stem Cap
72-30
Page 109
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