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Problem
High oil temperature
(Cont.)
High manifold
pressure at idler
12-30
Page 84
Table 1 (Cont.)
Fault Isolation Guide
Cause
Insufficient cooling air
Incorrect grade of oil
Oil cooler or oil cooler
lines are fully or
partially blocked
Thermostatic bypass
valve is not operating
correctly or seating
accurately
Too much blow-by
Leaks in engine
induction system
Air leak in induction
system
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Correction Steps
Make sure the air inlet and
1.
outlet ducting to the oil cooler
are operating correctly.
Repair or replace parts in
2.
accordance with the airframe
manufacturer's manual as
necessary.
Use only correct oil grade.
1. Remove the oil cooler and oil
cooler lines.
2. Flush out in accordance with
airframe manufacturer's
manual.
1. Replace thermostatic bypass
valve.
2. Replace the filter base if valve
is not seating properly.
1. Complete the differential
compression check in
accordance with Chapter 72-
30.
2. Complete the top overhaul
Look for leaks; repair leaks.
Examine the induction system for
leaks and repair as necessary.
NOTICE: If the induction system
has leaks, the engine will idle
rough.
© 2021 Avco Corporation. All Rights Reserved
Ref.
IOM
Appendix
A
OHM
72-30
OHM
February 2021
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