4
2
3
5
8
9
6
1
7
22
24
23
26
25
21
20
18
10
11
17
12
19
13
16
15
14
OIL
OIL
OIL
OIL
OIL
DIRECTION
COMPRESSED
PRESSURE
SCAVENGE
SUCTION
VENT
RETURN
OF FLOW OF
AIR
LINE
LINE
LINE
LINE
LINE
MOVEMENT
ASf12019
*1. Oil tank assembly
14. Oil pump assembly
*2. Oil temperature regulator thermostatic bypass valve
15. Filter bypass valve
*3. Oil temperature regulator oil cooler
16. Oil pressure gauge tap
*4. Cooling air duct
*17. Thermoswitch
18. Oil filter
*5. Vane axial cooling fan
*6. Cavity pressure gauge
19. Oil pressure pump
7. Compressor air inlet
20. Oil scavenge pumps
8. Modulating and shutoff valve
21. Relief valve
*22. Scavenge return line
9. Bleed-air outlet duct
*23. Oil pump inlet line
10. Combustion area
*24. Drain plug
11. Turbine section
12. Compressor section
25. Aaccessory drive section
13. Screen
26. Oil pressure switch
*Enclosure furnished equipment
Figure 12-19.--Engine lubrication system schematic.
cooler and the thermostatic temperature control valve.
THERMOSTATIC TEMPERATURE CON-
TROL VALVE.--The oil thermostatic temperature
The cooler assembly is a cylinder that contains a
control valve assembly consists of an inlet valve, an
multitude of small tubes, which extend the full length
outlet valve, and a relief valve. Attached to the oil
of the cylinder. The tubes are supported by perforated
cooler assembly, the control valve bypasses enough
end caps. Hot oil enters one end of the cylinder, flows
hot scavenge oil through the oil cooler to maintain oil
around and between the tubes, and exits at the cylinder
temperature within safe operating limits. The inlet
outlet. Heat imparted to the tubes is radiated to the
valve begins to open when oil temperature reaches
ambient air passing through the tubes. The amount of
operating temperature. Higher temperatures cause the
hot oil passing through the cooler is regulated by the
valve to open further, allowing more oil to enter the
thermostatic temperature control valve.
cooler. The outlet valve opens to the extent necessary
12-23
