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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
72-50 - RECIPROCATING ENGINE – LUBRICATION
1. System Description
Refer to the YO-233-B2A Engine Installation and Operation Manual
A.
2. Lubrication Maintenance
Oil Pressure Adjustment
A.
NOTICE: There is an adjustment screw (Figure 1) on the oil pressure relief valve housing.
Rotation of this screw used to either increase or decrease the oil pressure to keep
it within the specified operational limits in Appendix A of the YO-233-B2A
Engine Installation and Operation Manual.
Tools: A screwdriver is necessary for this procedure.
(1) The engine must be installed in the
airframe or on a test stand to complete
this procedure.
(2) Start and operate the engine as per
instructions in the YO-233-B2A
Engine Installation and Operation
Manual.
(3) Run-up the engine to 2000 rpm.
(4) Record the oil pressure reading.
(5) If the oil pressure is out of tolerance,
turn off the engine.
(6) To increase oil pressure, use a
screwdriver in the screw slot to turn
the oil pressure adjustment screw on
the oil pressure relief valve clockwise
(Figure 1).
(7) To decrease oil pressure, use a
screwdriver in the screw slot to turn
the oil pressure adjustment screw on
the oil pressure relief valve
counterclockwise.
(8) Start the engine and repeat the
previous steps until the oil pressure is
within specified limits.
NOTICE: Usual oil pressure can be expected to vary from 115 psi, during engine starting
and warm-up, to
Oil System Inspection
B.
(1)
If there are indications of leaking around the oil seals and gaskets, identify the source of
the leak and repair as necessary.
(2)
Replace leaky oil seals and gaskets.
© 2021 Avco Corporation. All Rights Reserved
February 2021
Adjustment Screw on the Oil
Pressure Relief Valve
Figure 1
72-50
Page 149
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