Table of Contents
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Problem
Excessive oil
consumption
(Cont.)
High oil
temperature
12-30
Page 94
Table 1 (Cont.)
Fault Isolation Guide
Cause
Worn valve guides
Oil leaks
Oil siphoned from
engine during flight
Oil level too high
Cooling baffles are
missing, broken, or
incorrectly installed
Oil level is too low
Incorrect grade of oil
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Corrective Action
1. Measure the valve guides for wear
as per instructions in the section
"Exhaust Valve and Guide
Inspection."
2. Replace worn valve guides.
Examine the external area of the
engine for leaks, identify and correct
the cause of any leak.
1. Verify that the oil filler cap is
secure and has either safety wire or
cable, and the oil access door
closes correctly.
2. Make sure that the breather tube is
accurately cut and the crankcase
ventilation system is installed
correctly per the airframe
manufacturer's instructions.
Do not fill above the maximum oil
sump capacity.
Drain some oil (start of "Oil Change
Procedure.")
Ensure that all baffles are installed
correctly and none are broken.
Replace as necessary.
NOTICE: Never modify, relocate, or
eliminate any cooling baffles.
Complete the "Oil Level Check" at
regular intervals. Keep oil at the
specified level.
Use the correct grade of oil per the
latest revision of Service Instruction
No. SI-1014..
© 2020 Avco Corporation. All Rights Reserved
Ref.
72-30
12-10
IOM
Appendix A
12-10
12-10
March 2020
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