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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
C. Oil Drain Tube Removal
NOTICE: There are different part numbers for some of the oil drain tube assemblies.
Apply a label to identify the location of each oil drain tube, in case the drain
tube is to be replaced. Refer to the applicable parts catalog for the correct part
number for the oil drain tube.
(1) Remove the hose clamps (Figure 12) from the hose attached to the drain tube assembly.
(2) Disconnect the hose from the nipple.
(3) Disconnect the drain tube fitting from the engine cylinder.
(4) Remove and discard the hose.
(5) Remove the drain tube assembly from the cylinder.
(6) Examine the drain tube for cracks or damage.
(7) Replace a cracked or damaged drain tube assembly.
NOTICE: Remove the cylinders by firing order 1-3-2-4 (Figure 13). Remove each cylinder as
an assembly.
NOTICE: During cylinder removal, identify and label the cylinder, piston, and other parts by
location (i.e., cylinder number) as they are removed for reference on assembly (to
ensure that each part is installed in the same location from which it was removed).
D. Intercylinder Baffle Removal
(1) Turn the baffle retainer hook to
disengage the retainer on the
intercylinder baffle (Figure 14).
(2) Remove the intercylinder baffle and
hook from between the cylinders.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Figure 13
Engine Cylinder Firing Order
Figure 14
Intercylinder Baffles
72-30
Page 205
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