Lycoming TEO-540-C1A Maintenance Manual page 122

Problem
Low oil pressure
(Cont.)
12-30
Page 92
Table 1 (Cont.)
Fault Isolation Guide
Cause
High oil temperature
Pressure relief valve is out
of adjustment
Dirt or metal chips under
the oil pressure relief valve
Blockage at inlet side of oil
pump
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Corrective Action
Examine the engine for these
conditions:
1. Low oil level. Complete the
"Oil Level Check"
procedure.
2. Incorrect grade/weight of oil
Refer to Appendix A.
3. Oil cooler bypass valve
seating and operation
4. Partial or full blockage in oil
cooler lines
5. High cylinder head
temperature
6. Excess blow-by
7. Blockage in air duct to the
oil cooler.
Per the "Oil Pressure
Adjustment" procedure, turn
the adjusting screw (on the oil
pressure relief valve) to adjust
oil pressure or change the
spring as necessary in the oil
pressure relief valve.
1. Remove, disassemble, and
clean (remove dirt or metal
chips) the oil pressure
relief valve.
2. Complete the "Oil Change
Procedure."
3. Complete a "Cylinder
Compression Check
Procedure."
Remove and clean the oil
suction screen and oil passage
on the inlet side of the oil
pump. Refer to the section
"Oil Suction Screen Removal/
Inspection/Cleaning/
Installation."
© 2018 Avco Corporation. All Rights Reserved
Ref.
12-10
IOM
72-50
AMM
72-50
72-50
12-10
72-30
12-10
November 2018