Cylinder Removal - Lycoming IO-390-D Series Maintenance Manual

(33) Install the valve rocker shaft cover with a new valve rocker shaft cover gasket with new
lock washers and nuts. Torque the nuts to 96 in.-lb. (11 Nm).
(34) Install the screws, rocker box cover with a new gasket on the cylinder head (Figure 5).
Torque the screws per the Special Torque Requirements Table in the latest revision of
the Service Table of Limits - SSP-1776.
(35) Enable power to the engine.
(36) Complete the "Operational Ground Check" in Chapter 72-00.

7. Cylinder Removal

CAUTION ANYTIME A CYLINDER IS REMOVED, INSTALL TORQUE HOLD-DOWN
PLATES (FIGURE 19) OR EQUIVALENT TO ENSURE A UNIFORM LOAD
ON THE MAIN BEARINGS IN THE CRANKCASE.
A. Disable all power to the engine and disconnect the engine ignition 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 intake and exhaust pipes
from the cylinder to be removed.
• Remove the clamps that attach the fuel
line to the shroud tube, disconnect the
fuel line from the injection nozzle
(Figure 11), put a cap on the end of the
fuel line and the injection nozzle.
Figure 11
Spark Plugs, Intake Pipes, and Injection Nozzles
72-30
Page 204
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Airframe Maintenance Manual
"Oil Change Procedure" in Chapter 12-10
"Spark Plug Removal" procedure in Chapter
74-20.
"Intake Pipe Removal" procedure in Chapter
72-80 and the airframe manufacturer's
instructions.
Figure 12
Oil Drain Tube
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March 2020