Oil Pressure Adjustment - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

1. Oil Pressure Adjustment

NOTICE: There is an adjustment screw (Figure 1) on the oil pressure relief valve housing.
Rotation of this screw either increases or decreases the oil pressure to keep it within
the specified operational limits in Appendix A of the TEO-540-C1A Engine
Installation and Operation Manual.
A. The engine must be installed in the aircraft or on a test
stand to complete this procedure.
B. Start and operate the engine per instructions in the TEO-
540-C1A Engine Installation and Operation Manual.
C. If the engine is at normal operating temperature, run-up the
engine to 2000 rpm.
D. Record the oil pressure reading.
E. If the oil pressure is out of tolerance, turn off the engine
and adjust the oil pressure as follows:
• To increase oil pressure, turn the pressure adjustment
screw on the oil pressure relief valve clockwise (Figure 1).
• To decrease oil pressure, turn the adjustment screw on the
oil pressure relief valve counterclockwise.
F. Start the engine and repeat the previous steps until the oil
pressure is within specified limits.
NOTICE: If the oil pressure cannot be adjusted to within specified limits by turning the
adjustment screw, refer to the "Oil Pressure Relief Valve Removal", "Oil Pressure
Relief Valve Inspection", and "Oil Pressure Relief Valve Installation" sections in
this chapter.
2. Oil System Inspection
A. Look for leaks around the oil sump and crankcase flanges.
B. If there are indications of leakage around the oil seals and gaskets, identify the source of the
leak and take corrective action as necessary. Record findings and corrective action in the
engine logbook.
C. Replace leaky oil seals and gaskets.
D. Complete an Operational Ground Check per Chapter 72-00 to make sure the engine operates
correctly and that there are no leaks.
3. Oil Hose Inspection
CAUTION MAKE SURE THERE ARE NO SHARP BENDS OR KINKS IN THE OIL
HOSE ROUTING TO PREVENT INTERRUPTIONS TO OIL FLOW. MAKE
SURE OIL HOSES ARE NOT TOUCHING HEAT SOURCES THAT COULD
DAMAGE THE OIL HOSE AND CAUSE OIL LOSS.
A. Examine oil hoses for cracks, kinks, brittleness, wear, damage or loose connections. Replace
any worn, cracked, kinked, damaged, or brittle oil hose with a new oil hose per the "Oil Hose
Replacement" procedure in this chapter. Do not try to repair the oil hose.
B. Tighten any loose connection at an oil hose per the torque values in the Standard Torque
Tables in the latest revision of the Service Table of Limits - SSP-1776.
© 2018 Avco Corporation. All Rights Reserved
November 2018
72-50 - LUBRICATION SYSTEM MAINTENANCE
Figure 1
Adjustment Screw on the Oil
Pressure Relief Valve
Page 259
72-50