Propeller Governor Oil Line Removal (Engines With Rear-Mounted Propeller Governor Drives); Propeller Governor Oil Line Installation (Engines With Rear-Mounted Propeller Governor Drives) - Lycoming IO-390-D Series Maintenance Manual

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual

19. Propeller Governor Oil Line Removal (Engines with Rear-Mounted Propeller Governor Drives)

A. Remove the bolt, lock washer, and washer from
the clip on the propeller governor oil line
(Figure 18). Discard the lock washer.
B. Remove the clip.
C. Remove the bolt, washer, lock washer, and nut
that attach the clamp the sump and crankcase.
Discard the lock washers.
D. Discard the clamp.
E. Disconnect the propeller governor oil line from
the elbows at both ends.
F. Remove the elbow fittings and O-ring from the
45° fitting. Discard the O-ring.
G. Apply Food-Grade Anti-Seize to the threads of
two plugs.
H. Install one plug in the engine and the other plug
in the propeller governor drive housing where
the elbows were removed.
I. Discard the propeller governor oil line.

20. Propeller Governor Oil Line Installation (Engines with Rear-Mounted Propeller Governor Drives)

A. Install the 90° elbow fitting (if removed) in the propeller governor line boss at the front of the
engine (Figure 19) as follows:
(1) Remove the plug in the engine and the plug in
the propeller governor drive housing.
(2) Apply Loctite
threads of the fitting that installs in the engine.
(3) Torque the fitting to 10% less than torque
requirements shown in Table 1.
(4) Torque to position the fitting as shown in
Figure 19.
Fitting Torque Values
Fitting size
1/4 -18 NPT 85 in.-lb.
3/8-18 NPT
½-14 NPT
B. Install the 45° elbow fitting with a new O-ring (if
removed) in the propeller governor drive housing
at the rear of the engine as follows:
(1) Apply engine oil to the threads of the fitting
that install in the engine.
(2) Torque the coupling to position the fitting as
shown in Figure 20 and to the torque value in
Table 1.
© 2020 Avco Corporation. All Rights Reserved
March 2020
®
#564 or equivalent to the
Table 1
Torque
9.6 Nm
110 in.-lb. 12.4 Nm
160 in.-lb. 18.0 Nm
Figure 18
Propeller Governor Oil Line
Figure 19
Propeller Governor Oil Line Fitting
at the Front of the Engine
Figure 20
Propeller Governor Oil Line Fitting on
the Propeller Governor Drive Housing
72-50
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