Oil Cooler Bypass Valve Removal; Oil Cooler Bypass Valve Cleaning; Oil Cooler Bypass Valve Installation - Lycoming IO-390-D Series Maintenance Manual

10. Oil Cooler Bypass Valve Removal

Remove and discard the safety wire/cable from the oil cooler bypass valve (Figure 7).
A.
On engines with an oil pressure screen (Figure 8).
Remove the oil cooler bypass valve and gasket
from the oil pressure screen housing. Discard the
gasket.
Oil Cooler Bypass Valve
(Engine with Oil Pressure Screen)

11. Oil Cooler Bypass Valve Cleaning

Clean the oil cooler bypass valve per instructions in the table in Chapter 05-30.

12. Oil Cooler Bypass Valve Installation

On engines with an oil pressure screen (Figure 8):
Apply Food Grade Anti-Seize on the
A.
threads of the oil cooler bypass valve.
Install the oil cooler bypass valve with a
B.
new gasket on the oil pressure screen
housing (Figure 8).
Torque the oil cooler bypass valve to 300
C.
in.-lbs. (34 Nm).
Safety wire/cable the oil cooler bypass
D.
valve.
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Safety Wire on the Oil Cooler Bypass Valve:
Figure 8
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Figure 7
On engines with an oil filter (Figure 9).
Remove the oil cooler bypass valve from the oil
filter base. Discard the gasket.
Oil Cooler Bypass Valve
(Engine with Oil Filter)
On engines with an oil filter (Figure 9):
Apply Food Grade Anti-Seize on the
A.
threads of the oil cooler bypass valve
Install the oil cooler bypass valve with
B.
a new gasket on the oil filter base as
shown in Figure 9.
Torque the oil cooler bypass valve to
C.
300 in.-lbs. (34 Nm).
Safety wire/cable the oil cooler bypass
D.
valve.
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Figure 9
March 2020