IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
72-50
March 2020
Page 239
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.
Figure 18
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
®
#564 or equivalent to the
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.
Table 1
Fitting Torque Values
Fitting size
Torque
1/4 -18 NPT 85 in.-lb.
9.6 Nm
3/8-18 NPT
110 in.-lb.
12.4 Nm
½-14 NPT
160 in.-lb.
18.0 Nm
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.
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
