IO-390-D Series Engine Maintenance Manual
72-30
© 2020 Avco Corporation. All Rights Reserved
Page 204
March 2020
IO-390-D Series Engine 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
Airframe Maintenance Manual
•
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.
“Oil Change Procedure” in Chapter 12-10
“Spark Plug Removal” procedure in Chapter
74-20.
•
Remove the intake and exhaust pipes
from the cylinder to be removed.
“Intake Pipe Removal” procedure in Chapter
72-80 and the airframe manufacturer’s
instructions.
•
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
Figure 12
Oil Drain Tube
